1
|
Kistler LM, Asamura K, Kasahara S, Miyoshi Y, Mouikis CG, Keika K, Petrinec SM, Stevens ML, Hori T, Yokota S, Shinohara I. The variable source of the plasma sheet during a geomagnetic storm. Nat Commun 2023; 14:6143. [PMID: 37903790 PMCID: PMC10616164 DOI: 10.1038/s41467-023-41735-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Accepted: 09/12/2023] [Indexed: 11/01/2023] Open
Abstract
Both solar wind and ionospheric sources contribute to the magnetotail plasma sheet, but how their contribution changes during a geomagnetic storm is an open question. The source is critical because the plasma sheet properties control the enhancement and decay rate of the ring current, the main cause of the geomagnetic field perturbations that define a geomagnetic storm. Here we use the solar wind composition to track the source and show that the plasma sheet source changes from predominantly solar wind to predominantly ionospheric as a storm develops. Additionally, we find that the ionospheric plasma during the storm main phase is initially dominated by singly ionized hydrogen (H+), likely from the polar wind, a low energy outflow from the polar cap, and then transitions to the accelerated outflow from the dayside and nightside auroral regions, identified by singly ionized oxygen (O+). These results reveal how the access to the magnetotail of the different sources can change quickly, impacting the storm development.
Collapse
Affiliation(s)
- L M Kistler
- University of New Hampshire, Durham, NH, USA.
- Nagoya University, Nagoya, Japan.
| | - K Asamura
- Japan Aerospace Exploration Agency, Sagamihara, Japan
| | | | | | - C G Mouikis
- University of New Hampshire, Durham, NH, USA
| | - K Keika
- University of Tokyo, Tokyo, Japan
| | - S M Petrinec
- Lockheed Martin Advanced Technology Center, Palo Alto, CA, USA
| | - M L Stevens
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
| | - T Hori
- Nagoya University, Nagoya, Japan
| | - S Yokota
- Osaka University, Toyonaka, Japan
| | - I Shinohara
- Japan Aerospace Exploration Agency, Sagamihara, Japan
| |
Collapse
|
2
|
Čulo M, Licciardello S, Ishida K, Mukasa K, Ayres J, Buhot J, Hsu YT, Imajo S, Qiu MW, Saito M, Uezono Y, Otsuka T, Watanabe T, Kindo K, Shibauchi T, Kasahara S, Matsuda Y, Hussey NE. Expanded quantum vortex liquid regimes in the electron nematic superconductors FeSe 1-xS x and FeSe 1-xTe x. Nat Commun 2023; 14:4150. [PMID: 37438333 DOI: 10.1038/s41467-023-39730-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/21/2023] [Indexed: 07/14/2023] Open
Abstract
The quantum vortex liquid (QVL) is an intriguing state of type-II superconductors in which intense quantum fluctuations of the superconducting (SC) order parameter destroy the Abrikosov lattice even at very low temperatures. Such a state has only rarely been observed, however, and remains poorly understood. One of the key questions is the precise origin of such intense quantum fluctuations and the role of nearby non-SC phases or quantum critical points in amplifying these effects. Here we report a high-field magnetotransport study of FeSe1-xSx and FeSe1-xTex which show a broad QVL regime both within and beyond their respective electron nematic phases. A clear correlation is found between the extent of the QVL and the strength of the superconductivity. This comparative study enables us to identify the essential elements that promote the QVL regime in unconventional superconductors and to demonstrate that the QVL regime itself is most extended wherever superconductivity is weakest.
Collapse
Affiliation(s)
- M Čulo
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525, ED, Nijmegen, Netherlands.
- Institut za fiziku, Bijenička cesta 46, HR-10000, Zagreb, Croatia.
| | - S Licciardello
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525, ED, Nijmegen, Netherlands
| | - K Ishida
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - K Mukasa
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - J Ayres
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
| | - J Buhot
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
| | - Y-T Hsu
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525, ED, Nijmegen, Netherlands
- Center for Theory and Computation, National Tsing Hua University, No. 101, Section. 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
| | - S Imajo
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - M W Qiu
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - M Saito
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - Y Uezono
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori, 036-8561, Japan
| | - T Otsuka
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori, 036-8561, Japan
| | - T Watanabe
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori, 036-8561, Japan
| | - K Kindo
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - S Kasahara
- Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushimanaka, Kita-Ku, Okayama, 700-8530, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Sakyo-Ku, Kyoto, 606-8502, Japan
| | - N E Hussey
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Toernooiveld 7, 6525, ED, Nijmegen, Netherlands.
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK.
| |
Collapse
|
3
|
Miyoshi Y, Shinohara I, Ukhorskiy S, Claudepierre SG, Mitani T, Takashima T, Hori T, Santolik O, Kolmasova I, Matsuda S, Kasahara Y, Teramoto M, Katoh Y, Hikishima M, Kojima H, Kurita S, Imajo S, Higashio N, Kasahara S, Yokota S, Asamura K, Kazama Y, Wang SY, Jun CW, Kasaba Y, Kumamoto A, Tsuchiya F, Shoji M, Nakamura S, Kitahara M, Matsuoka A, Shiokawa K, Seki K, Nosé M, Takahashi K, Martinez-Calderon C, Hospodarsky G, Colpitts C, Kletzing C, Wygant J, Spence H, Baker DN, Reeves GD, Blake JB, Lanzerotti L. Collaborative Research Activities of the Arase and Van Allen Probes. Space Sci Rev 2022; 218:38. [PMID: 35757012 PMCID: PMC9213325 DOI: 10.1007/s11214-022-00885-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 03/23/2022] [Indexed: 06/15/2023]
Abstract
This paper presents the highlights of joint observations of the inner magnetosphere by the Arase spacecraft, the Van Allen Probes spacecraft, and ground-based experiments integrated into spacecraft programs. The concurrent operation of the two missions in 2017-2019 facilitated the separation of the spatial and temporal structures of dynamic phenomena occurring in the inner magnetosphere. Because the orbital inclination angle of Arase is larger than that of Van Allen Probes, Arase collected observations at higher L -shells up to L ∼ 10 . After March 2017, similar variations in plasma and waves were detected by Van Allen Probes and Arase. We describe plasma wave observations at longitudinally separated locations in space and geomagnetically-conjugate locations in space and on the ground. The results of instrument intercalibrations between the two missions are also presented. Arase continued its normal operation after the scientific operation of Van Allen Probes completed in October 2019. The combined Van Allen Probes (2012-2019) and Arase (2017-present) observations will cover a full solar cycle. This will be the first comprehensive long-term observation of the inner magnetosphere and radiation belts.
Collapse
Affiliation(s)
- Y. Miyoshi
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - I. Shinohara
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, 252-5210 Japan
| | - S. Ukhorskiy
- Applied Physics Laboratory, The Johns Hopkins University, 11101 Johns Hopkins Rd, Laurel, MD 20723 USA
| | - S. G. Claudepierre
- Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, 7115 Math Sciences Bldg., Los Angeles, CA 90095 USA
| | - T. Mitani
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, 252-5210 Japan
| | - T. Takashima
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, 252-5210 Japan
| | - T. Hori
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - O. Santolik
- Faculty of Mathematics an Physics, Charles University, V Holesovickach 2, 18000 Prague, Czechia
- Dept. of Space Physics, Institute of Atmospheric Physics, Czech Academy of Sciences, Bocni II 1401, 14100 Prague, Czechia
| | - I. Kolmasova
- Faculty of Mathematics an Physics, Charles University, V Holesovickach 2, 18000 Prague, Czechia
- Dept. of Space Physics, Institute of Atmospheric Physics, Czech Academy of Sciences, Bocni II 1401, 14100 Prague, Czechia
| | - S. Matsuda
- Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192 Japan
| | - Y. Kasahara
- Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192 Japan
| | - M. Teramoto
- Graduate School of Engineering, Kyushu Institute of Technology, Kitakyusyu, 804-8550 Japan
| | - Y. Katoh
- Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
| | - M. Hikishima
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, 252-5210 Japan
| | - H. Kojima
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 611-0011 Japan
| | - S. Kurita
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 611-0011 Japan
| | - S. Imajo
- Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan
| | - N. Higashio
- Strategic Planning and Management Department, Japan Aerospace Exploration Agency, Tokyo, 101-8008 Japan
| | - S. Kasahara
- Graduate School of Science, University of Tokyo, Tokyo, 113-0033 Japan
| | - S. Yokota
- Graduate School of Science, Osaka University, Toyonaka, 560-0043 Japan
| | - K. Asamura
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, 252-5210 Japan
| | - Y. Kazama
- Institute of Astronomy and Astrophysics, Academia Sinica, No. 1, Sec. 4, Roosevelt Rd, Taipei, 10617 Taiwan
| | - S.-Y. Wang
- Institute of Astronomy and Astrophysics, Academia Sinica, No. 1, Sec. 4, Roosevelt Rd, Taipei, 10617 Taiwan
| | - C.-W. Jun
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - Y. Kasaba
- Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
| | - A. Kumamoto
- Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
| | - F. Tsuchiya
- Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
| | - M. Shoji
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - S. Nakamura
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
- Institute for Advanced Research, Nagoya University, Nagoya, 464-8601 Japan
| | - M. Kitahara
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
- Graduate School of Science, Tohoku University, Sendai, 980-8578 Japan
| | - A. Matsuoka
- Graduate School of Science, Kyoto University, Kyoto, 606-8502 Japan
| | - K. Shiokawa
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - K. Seki
- Graduate School of Science, University of Tokyo, Tokyo, 113-0033 Japan
| | - M. Nosé
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - K. Takahashi
- Applied Physics Laboratory, The Johns Hopkins University, 11101 Johns Hopkins Rd, Laurel, MD 20723 USA
| | - C. Martinez-Calderon
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601 Japan
| | - G. Hospodarsky
- Department of Physics and Astronomy, University of Iowa, Van Allen Hall (VAN), Iowa City, IA 52242 USA
| | - C. Colpitts
- School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 USA
| | - Craig Kletzing
- Department of Physics and Astronomy, University of Iowa, Van Allen Hall (VAN), Iowa City, IA 52242 USA
| | - J. Wygant
- School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 USA
| | - H. Spence
- Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, 8 College Road, Durham, NH 03824 USA
| | - D. N. Baker
- Laboratory for Atmospheric and Space Physics, University of Colorado, 3665 Discovery Drive, 600 UCB, Boulder, CO 80303 USA
| | - G. D. Reeves
- Inteligence & Space Reserarch Division, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM USA
| | - J. B. Blake
- The Aerospace Corporation, P.O. Box 92957, Los Angeles, CA 90009-2957 USA
| | - L. Lanzerotti
- Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102 USA
| |
Collapse
|
4
|
Kasahara S, Suzuki H, Machida T, Sato Y, Ukai Y, Murayama H, Suetsugu S, Kasahara Y, Shibauchi T, Hanaguri T, Matsuda Y. Quasiparticle Nodal Plane in the Fulde-Ferrell-Larkin-Ovchinnikov State of FeSe. Phys Rev Lett 2021; 127:257001. [PMID: 35029441 DOI: 10.1103/physrevlett.127.257001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 11/16/2021] [Indexed: 06/14/2023]
Abstract
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, characterized by Cooper pairs condensed at finite momentum, has been a long-sought state that remains unresolved in many classes of fermionic systems, including superconductors and ultracold atoms. A fascinating aspect of the FFLO state is the emergence of periodic nodal planes in real space, but its observation is still lacking. Here we investigate the superconducting order parameter at high magnetic fields H applied perpendicular to the ab plane in a high-purity single crystal of FeSe. The heat capacity and magnetic torque provide thermodynamic evidence for a distinct superconducting phase at the low-temperature/high-field corner of the phase diagram. Despite the bulk superconductivity, spectroscopic-imaging scanning tunneling microscopy performed on the same crystal demonstrates that the order parameter vanishes at the surface upon entering the high-field phase. These results provide the first demonstration of a pinned planar node perpendicular to H, which is consistent with a putative FFLO state.
Collapse
Affiliation(s)
- S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - H Suzuki
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Machida
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - Y Sato
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - Y Ukai
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - H Murayama
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Suetsugu
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - T Hanaguri
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| |
Collapse
|
5
|
Shimojima T, Motoyui Y, Taniuchi T, Bareille C, Onari S, Kontani H, Nakajima M, Kasahara S, Shibauchi T, Matsuda Y, Shin S. Discovery of mesoscopic nematicity wave in iron-based superconductors. Science 2021; 373:1122-1125. [PMID: 34516833 DOI: 10.1126/science.abd6701] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
[Figure: see text].
Collapse
Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Y Motoyui
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan
| | - T Taniuchi
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - C Bareille
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S Onari
- Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - H Kontani
- Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - M Nakajima
- Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Shin
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8581, Japan.,Material Innovation Research Center (MIRC), The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.,Office of University Professor, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| |
Collapse
|
6
|
Makishima H, Nannya Y, Momozawa Y, Gurnari C, Kulasekararaj A, Yoshizato T, Takeda J, Atsuta Y, Shiozawa Y, Iijima-Yamashita Y, Saiki R, Yoshida K, Shiraishi Y, Nagata Y, Onizuka M, Nakagawa M, Itonaga H, Kanda Y, Miyazaki Y, Sanada M, Tsurumi H, Kasahara S, Kondo-Takaori A, Ohyashiki K, Kiguchi T, Matsuda F, Jansen J, Papaemmanuil E, Creignou M, Tobiasson M, Hellström-Lindberg E, Polprasert C, Malcovati L, Cazzola M, Haferlach T, Maciejewski J, Kamatani Y, Miyano S, Ogawa S. Topic: AS04-MDS Biology and Pathogenesis/AS04b-Clonal diversity & evolution. Leuk Res 2021. [DOI: 10.1016/j.leukres.2021.106679.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
7
|
Yasuda M, Tachi T, Osawa T, Watanabe H, Inoue S, Makino T, Nagaya K, Morita M, Tanaka K, Aoyama S, Kasahara S, Teramachi H, Mizui T. Risk factors for thrombocytopenia and analysis of time to platelet transfusion after azacitidine treatment. Pharmazie 2021; 76:444-449. [PMID: 34481536 DOI: 10.1691/ph.2021.1566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The use of azacitidine (AZA) has been known to lead to a high incidence of hematotoxic adverse events. The aims of this study were to identify the risk factors for thrombocytopenia after the administration of AZA and to analyze time to the initial platelet transfusion. Sixty-two patients with myelodysplastic syndrome (MDS), who were treated with AZA in Gifu Municipal Hospital between March 2012 and June 2020, were included in this study. The risk factors for thrombocytopenia were identified using univariate analysis of patient characteristics, disease type, and laboratory values immediately before the start of treatment. Variables with p<0.2 identified in the univariate analysis were used as independent variables in the multivariate analysis. This analysis identified "creatinine clearance (CCr) <60 mL/min" as a significant factor (odds ratio, 4.790; 95% confidence interval [CI], 1.380-16.70; p=0.014). Subsequently, time in days to the initial platelet transfusion after the initial administration of AZA was analyzed using the log-rank test. The overall median time in days to platelet transfusion was 370 days. The log-rank test was used to determine the influence of patient characteristics, disease type, and laboratory values immediately before the start of treatment. The subsequent Cox proportional hazard regression analysis using variables with p<0.2 as independent variables identified "hemoglobin (Hb) <8.0 g/dL" as a significant factor (hazard ratio, 2.143; 95% CI, 1.001-4.573; p=0.048). The results of this study led to the following clinical implications: first, patients with CCr of <60 mL/min at the start of treatment should be treated with caution due to the risk of thrombocytopenia. Second, patients with Hb of <8.0 g/dL at the start of treatment may require platelet transfusion in the early stage of treatment.
Collapse
Affiliation(s)
- M Yasuda
- Department of Pharmacy, Gifu Municipal Hospital, Japan; Laboratory of Clinical Pharmacy, Gifu Pharmaceutical University, Japan;,
| | - T Tachi
- Department of Pharmacy, Gifu Municipal Hospital, Japan; Laboratory of Clinical Pharmacy, Gifu Pharmaceutical University, Japan
| | - T Osawa
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - H Watanabe
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - S Inoue
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - T Makino
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - K Nagaya
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - M Morita
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - K Tanaka
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - S Aoyama
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| | - S Kasahara
- Department of Hematology, Gifu Municipal Hospital, Gifu, Japan
| | - H Teramachi
- Laboratory of Clinical Pharmacy, Gifu Pharmaceutical University, Japan
| | - T Mizui
- Department of Pharmacy, Gifu Municipal Hospital, Japan
| |
Collapse
|
8
|
Kuwayama T, Matsuura K, Gouchi J, Yamakawa Y, Mizukami Y, Kasahara S, Matsuda Y, Shibauchi T, Kontani H, Uwatoko Y, Fujiwara N. Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe. Sci Rep 2021; 11:17265. [PMID: 34446750 PMCID: PMC8390510 DOI: 10.1038/s41598-021-96277-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 08/04/2021] [Indexed: 11/19/2022] Open
Abstract
FeSe is a unique high-\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$T_c$$\end{document}Tc iron-based superconductor in which nematicity, superconductivity, and magnetism are entangled with each other in the P-T phase diagram. We performed \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$^{77}$$\end{document}77Se-nuclear magnetic resonance measurements under pressures of up to 3.9 GPa on 12% S-substituted FeSe, in which the complex overlap between the nematicity and magnetism are resolved. A pressure-induced Lifshitz transition was observed at 1.0 GPa as an anomaly of the density of states and as double superconducting (SC) domes accompanied by different types of antiferromagnetic (AF) fluctuations. The low-\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc SC dome below 1 GPa is accompanied by strong AF fluctuations, whereas the high-\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc SC dome develops above 1 GPa, where AF fluctuations are fairly weak. These results suggest the importance of the \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$d_{xy}$$\end{document}dxy orbital and its intra-orbital coupling for the high-\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$T_{\mathrm{c}}$$\end{document}Tc superconductivity.
Collapse
Affiliation(s)
- T Kuwayama
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cyo, Sakyo-ku, Kyoto, 606-8501, Japan
| | - K Matsuura
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.,Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan
| | - J Gouchi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Y Yamakawa
- Department of Physics, Nagoya University, Furo-cho, Nagoya, 464-8602, Japan
| | - Y Mizukami
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - S Kasahara
- Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.,Department of Physics, Okayama University, Okayama, 700-8530, Japan
| | - Y Matsuda
- Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - T Shibauchi
- Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - H Kontani
- Department of Physics, Nagoya University, Furo-cho, Nagoya, 464-8602, Japan
| | - Y Uwatoko
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - N Fujiwara
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu-cyo, Sakyo-ku, Kyoto, 606-8501, Japan.
| |
Collapse
|
9
|
Yokoi T, Ma S, Kasahara Y, Kasahara S, Shibauchi T, Kurita N, Tanaka H, Nasu J, Motome Y, Hickey C, Trebst S, Matsuda Y. Half-integer quantized anomalous thermal Hall effect in the Kitaev material candidate α-RuCl 3. Science 2021; 373:568-572. [PMID: 34326240 DOI: 10.1126/science.aay5551] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 04/19/2020] [Accepted: 06/29/2021] [Indexed: 02/01/2023]
Abstract
Half-integer thermal quantum Hall conductance has recently been reported for the two-dimensional honeycomb material α-RuCl3 We found that the half-integer thermal Hall plateau appears even for a magnetic field with no out-of-plane components. The measured field-angular variation of the quantized thermal Hall conductance has the same sign structure as the topological Chern number of the pure Kitaev spin liquid. This observation suggests that the non-Abelian topological order associated with fractionalization of the local magnetic moments persists even in the presence of non-Kitaev interactions in α-RuCl3.
Collapse
Affiliation(s)
- T Yokoi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - S Ma
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - N Kurita
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - H Tanaka
- Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
| | - J Nasu
- Department of Physics, Yokohama National University, Hodogaya, Yokohama 240-8501, Japan
| | - Y Motome
- Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - C Hickey
- Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany
| | - S Trebst
- Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
| |
Collapse
|
10
|
Miyoshi Y, Hosokawa K, Kurita S, Oyama SI, Ogawa Y, Saito S, Shinohara I, Kero A, Turunen E, Verronen PT, Kasahara S, Yokota S, Mitani T, Takashima T, Higashio N, Kasahara Y, Matsuda S, Tsuchiya F, Kumamoto A, Matsuoka A, Hori T, Keika K, Shoji M, Teramoto M, Imajo S, Jun C, Nakamura S. Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae. Sci Rep 2021; 11:13724. [PMID: 34257336 PMCID: PMC8277844 DOI: 10.1038/s41598-021-92611-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 06/14/2021] [Indexed: 11/16/2022] Open
Abstract
Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.
Collapse
Affiliation(s)
- Y Miyoshi
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan.
| | - K Hosokawa
- Graduate School of Communication Engineering and Informatics, University of Electro-Communications, Chofu, 182-8585, Japan
| | - S Kurita
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji, 611-0011, Japan
| | - S-I Oyama
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan.,National Institute of Polar Research, Tachikawa, 190-8518, Japan.,University of Oulu, Pentti Kaiteran katu 1, Linnanmaa, Oulu, Finland
| | - Y Ogawa
- National Institute of Polar Research, Tachikawa, 190-8518, Japan.,The Graduate University for Advanced Studies, SOKENDAI, Hayama, 240-0193, Japan.,Joint Support-Center for Data Science Research, Research Organization of Information and Systems, Tachikawa, 190-8518, Japan
| | - S Saito
- National Institute of Information and Communications Technology, Tokyo, 184-8795, Japan
| | - I Shinohara
- Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
| | - A Kero
- Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
| | - E Turunen
- Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
| | - P T Verronen
- Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland.,Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, Finland
| | - S Kasahara
- Graduate School of Science, University of Tokyo, Tokyo, 113-0033, Japan
| | - S Yokota
- Graduate School of Science, Osaka University, Toyonaka, 560-0043, Japan
| | - T Mitani
- Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
| | - T Takashima
- Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
| | - N Higashio
- Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
| | - Y Kasahara
- Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192, Japan
| | - S Matsuda
- Japan Aerospace Exploration Agency (JAXA), Sagamihara, 252-5210, Japan
| | - F Tsuchiya
- Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - A Kumamoto
- Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - A Matsuoka
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - T Hori
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan
| | - K Keika
- Graduate School of Science, University of Tokyo, Tokyo, 113-0033, Japan
| | - M Shoji
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan
| | - M Teramoto
- Graduate School of Engineering, Kyushu Institute of Technology, Fukuoka, 820-8501, Japan
| | - S Imajo
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - C Jun
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan
| | - S Nakamura
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, 464-8601, Japan
| |
Collapse
|
11
|
Kasahara S, Sato Y, Licciardello S, Čulo M, Arsenijević S, Ottenbros T, Tominaga T, Böker J, Eremin I, Shibauchi T, Wosnitza J, Hussey NE, Matsuda Y. Evidence for an Fulde-Ferrell-Larkin-Ovchinnikov State with Segmented Vortices in the BCS-BEC-Crossover Superconductor FeSe. Phys Rev Lett 2020; 124:107001. [PMID: 32216412 DOI: 10.1103/physrevlett.124.107001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/05/2020] [Indexed: 06/10/2023]
Abstract
We present resistivity and thermal-conductivity measurements of superconducting FeSe in intense magnetic fields up to 35 T applied parallel to the ab plane. At low temperatures, the upper critical field μ_{0}H_{c2}^{ab} shows an anomalous upturn, while thermal conductivity exhibits a discontinuous jump at μ_{0}H^{*}≈24 T well below μ_{0}H_{c2}^{ab}, indicating a first-order phase transition in the superconducting state. This demonstrates the emergence of a distinct field-induced superconducting phase. Moreover, the broad resistive transition at high temperatures abruptly becomes sharp upon entering the high-field phase, indicating a dramatic change of the magnetic-flux properties. We attribute the high-field phase to the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state, where the formation of planar nodes gives rise to a segmentation of the flux-line lattice. We point out that strongly orbital-dependent pairing as well as spin-orbit interactions, the multiband nature, and the extremely small Fermi energy are important for the formation of the FFLO state in FeSe.
Collapse
Affiliation(s)
- S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502 Japan
| | - Y Sato
- Department of Physics, Kyoto University, Kyoto 606-8502 Japan
| | - S Licciardello
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
| | - M Čulo
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
| | - S Arsenijević
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
| | - T Ottenbros
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
| | - T Tominaga
- Department of Physics, Kyoto University, Kyoto 606-8502 Japan
| | - J Böker
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
| | - I Eremin
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
- National University of Science and Technology MISiS, 119049 Moscow, Russian Federation
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - J Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - N E Hussey
- High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, 6525 ED Nijmegen, The Netherlands
- H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL, United Kingdom
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502 Japan
| |
Collapse
|
12
|
Yip KY, Ho KO, Yu KY, Chen Y, Zhang W, Kasahara S, Mizukami Y, Shibauchi T, Matsuda Y, Goh SK, Yang S. Measuring magnetic field texture in correlated electron systems under extreme conditions. Science 2019; 366:1355-1359. [DOI: 10.1126/science.aaw4278] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 11/06/2019] [Indexed: 11/02/2022]
Abstract
Pressure is a clean, continuous, and systematic tuning parameter among the competing ground states in strongly correlated electron systems such as superconductivity and magnetism. However, owing to the restricted access to samples enclosed in high-pressure devices, compatible magnetic field sensors with sufficient sensitivity are rare. We used nitrogen vacancy centers in diamond as a spatially resolved vector field sensor for material research under pressure at cryogenic temperatures. Using a single crystal of BaFe2(As0.59P0.41)2 as a benchmark, we extracted the superconducting transition temperature, the local magnetic field profile in the Meissner state, and the critical fields. The method developed in this work offers a distinct tool for probing and understanding a range of quantum many-body systems.
Collapse
Affiliation(s)
- King Yau Yip
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Kin On Ho
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - King Yiu Yu
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Yang Chen
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Wei Zhang
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - S. Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y. Mizukami
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T. Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - Y. Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Swee K. Goh
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Sen Yang
- Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| |
Collapse
|
13
|
Kadowaki S, Yamazaki S, Kotani Y, Tsuji T, Sakoda N, Kobayashi Y, Horio N, Goto T, Muraoka G, Ozawa S, Suezawa T, Kuroko Y, Tateishi A, Shimizu S, Kasahara S. P1833The c-fos mRNA expression reveals persistent myocardial stretch in the right ventricle during asphyxiated cardiac arrest. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Donation after circulatory death (DCD) heart transplantation has been debated over the past decades because of the shortage of donor. The right ventricular dysfunction is one of the remaining problems for clinical implication of DCD heart transplantation. DCD hearts suffering from the volume overload have a potential to aggravate the right ventricular dysfunction after heart transplantation. The c-fos mRNA is one of the “immediate” response genes to mechanical stresses, such as myocardial cell stretch, without neural and humoral factors. In this study, we assessed myocardial stretch during asphyxiated cardiac arrest using c-fos mRNA expression.
Purpose
The purpose of this study is to reveal the impact of right ventricular volume overload during asphyxiated cardiac arrest.
Methods
Male Wistar rats (8 weeks of age, n=18) were anesthetized with paralyzed ventilation. The trachea was dissected and ligated to initiate asphyxiation. Hearts were harvested at 3 time points: 0, 15 and 30 minutes after termination of the ventilation. Free walls of right and left ventricle were sectioned and immersed in RNA stabilization solution as soon as possible. Total RNA was extracted from these tissues using a guanidine thiocyanate-phenol-chloroform method and cDNA was synthesized using a reverse transcriptase. Next, we measured the quantified expression level by using the droplet digital PCR method with a probe and primers for c-fos gene. Expression of c-fos level was divided by extracted TATA binding protein (TBP) level as a control marker, the ratio of c-fos and TBP was used in analysis.
Results
In the left ventricle, the expression of c-fos rapidly increased by 15 minutes (0.81±0.24 (c-fos/TBP), p<0.05 by one-way ANOVA followed by the Dunnett's test) compared to at 0 minutes (0.21±0.06), but the expression level recovered to the baseline level at 30 minutes after termination of the ventilation (0.19±0.03). On the other hand, in the right ventricle, the c-fos expression was gradually elevated and peaked at 30 minutes (0.88±0.20, p<0.05 by the Dunnett's test) compared to at 0 minutes (0.22±0.05).
Conclusion
These results suggest that the volume overload to the right ventricle during asphyxiated cardiac arrest prolongs compared to that to the left ventricle, which may cause the right ventricular dysfunction after DCD heart transplantation.
Collapse
Affiliation(s)
| | - S Yamazaki
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | - Y Kotani
- Okayama University, Okayama, Japan
| | - T Tsuji
- Okayama University, Okayama, Japan
| | - N Sakoda
- Okayama University, Okayama, Japan
| | | | - N Horio
- Okayama University, Okayama, Japan
| | - T Goto
- Okayama University, Okayama, Japan
| | | | - S Ozawa
- Okayama University, Okayama, Japan
| | | | - Y Kuroko
- Okayama University, Okayama, Japan
| | | | - S Shimizu
- National Cerebral and Cardiovascular Center, Osaka, Japan
| | | |
Collapse
|
14
|
Fujihashi T, Sataka Y, Nochioka K, Miura M, Kasahara S, Sato M, Aoyanagi H, Yamanaka S, Hayashi H, Shiroto T, Sugimura K, Takahashi J, Miyata S, Shimokawa H. P6337Prognostic impacts of serum uric acid levels in patients with chronic heart failure: insights from the CHART-2 Study. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Prognostic impact of serum uric acid (UA) levels in patients with heart failure (HF) remains to be fully elucidated, as previous studies were inconclusive with small study sample sizes. Furthermore, although the J-curve relationship between serum UA levels and cardiovascular events has been suggested in patients with hypertension and those with diabetes, it is still unclear whether this is also the case for patients with HF.
Purpose
We examined the prognostic impacts of serum UA levels in HF patients, using the database of our Chronic Heart Failure Registry and Analysis in the Tohoku district (CHART)-2 Study, the largest multicenter, prospective, observational cohort study for cardiovascular patients with HF or those at risk of HF in Japan (N=10,219).
Methods
First, we determined the cut-off value of serum UA levels at baseline by the Classification and Regression Tree (CART). Then, we divided 4,652 consecutive HF patients in the CHART-2 Study into 4 groups; G1 (<3.8 mg/dL, N=313), G2 (3.8–7.1 mg/dL, N=3,070), G3 (7.2–9.2 mg/dL, N=1,018), and G4 (≥9.3 mg/dL, N=251). Among the 4 groups, we compared clinical characteristics and incidence of all-cause death, HF hospitalization, and a composite of all-cause death and HF hospitalization.
Results
Mean age in G1, G2, G3, and G4 was 71±12, 69±12, 68±13, and 69±15 years, respectively (P<0.001). G1 was characterized by a significantly high prevalence of women as compared with G2, G3 and G4 (59, 32, 24 and 23%, respectively). Serum creatinine levels (0.8±0.4, 0.9±0.4, 1.2±0.6 and 1.4±0.8 mg/dL, respectively), prevalence of atrial fibrillation (34, 39, 45 and 50%, respectively), and diuretics use (36, 45, 67, 89%, respectively) increased from G1, G2, G3 to G4 (all P<0.001), while left ventricular ejection fraction decreased from G1, G2, G3 to G4 (59±15, 58±15, 54±15, and 52±17%, respectively, P<0.001). Median BNP levels were comparably low in G1 and G2 and then increased to G3 and G4 (94.4, 91.5, 130 and 192.5 pg/mL, respectively, P<0.001). As a HF etiology, prevalence of ischemic heart disease was highest in G2 and lowest in G4 (48, 52, 48, 38%, respectively, P<0.001), while that of dilated cardiomyopathy increased from G1, G2, G3 to G4 (11, 12, 16 and 20%, respectively, P<0.001). During the median follow-up period of 6.3 years, in G1, G2, G3 and G4, 111 (35%), 905 (29%), 370 (36%) and 139 (55%) patients died and 79 (25%), 729 (24%), 300 (29%) and 115 (46%) experienced HF hospitalization, respectively (both P<0.001). Cox proportional hazard models adjusted for clinical backgrounds showed that, as compared with G2, both G1 and G4 had increased risk for all-cause death, HF hospitalization and a composite of all-cause death, and HF hospitalization, indicating the J-curve relationship between serum UA levels and prognosis (Figure).
Prognostic impacts of serum UA levels
Conclusions
Both decreased and increased UA levels were associated with increased incidence of death and HF hospitalization in HF patients.
Collapse
Affiliation(s)
- T Fujihashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - Y Sataka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K Nochioka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M Miura
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Kasahara
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M Sato
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - H Aoyanagi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Yamanaka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - H Hayashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T Shiroto
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K Sugimura
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - J Takahashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Miyata
- Tohoku University Graduate School of Medicine, Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | - H Shimokawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| |
Collapse
|
15
|
Hirai K, Baba K, Goto T, Ousaka D, Oh H, Kasahara S, Ohtsuki S. P3651Outcomes of right ventricular outflow tract reconstruction in children: comparison between bovine jugular vein graft and expanded polytetrafluoroethylene graft. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Various types of conduits are available for right ventricular outflow tract reconstruction (RVOTR). The bovine jugular vein graft (BJVG) and expanded polytetrafluoroethylene graft (ePTFEG) have been descrived as an alternative to the homograft for RVOTR. Purpose- This study summarized the results to evaluate the single-center operation of RVOTR using BJVG and ePTFEG.
Methods
The valve functions of 27 patients under 20 years old who underwent primary RVOTR with BJVG and 26 patients with ePTFEG at our university hospital between 2013 and 2018 were retrospectively investigated. The valve conditions were assessed using echocardiography and cardiac catheterization.
Results
The median age at the time of operation was 1.8 years old (range, 6 days to 7.8 years old) with BJVG and 2.2 years old (range, 8 months to 9.1 years old) with ePTFEG. The median follow-up time was 3.4 years (range, 2 months to 5.2 years) with BJVG and 2.1 years (range, 1 month to 5.1 years) with ePTFEG. The peak RVOT gradient of BJVG was lower than ePTFEG (10.6±7.7 mmHg versus 18.1±16.2 mmHg, P=0.035). There were no differences in branch pulmonary stenosis defined as peak gradient up to 36mmHg (40.7% versus 50.0%, P=0.50) and pulmonary regurgitation graded worse than moderate (18.5% versus 11.5%, P=0.48) with BJVG and ePTFEG, respectively. Aneurysmal dilatation of the conduit was seen 22.2% with BJVG but none of patients with ePTFEG (P=0.01). All of patients with aneurysmal dilated BJVG had branch pulmonary stenosis. There were no differences in catheter intervention for branch pulmonary stenosis (22.2% versus 30.8%, P=0.48) and conduit replacement (11.1% versus 7.7%, log rank P=0.67) with BJVG and ePTFEG, respectively. There were no deaths during the fllow-up period in both groups.
Conclusions
The outcomes of RVOTR with BJVG and ePTFEG were clinically satisfactory. Aneurysmal dilatation was seen with BJVG and branch pulmonary stenosis was the risk factor for aneurysmal dilatation.
Collapse
Affiliation(s)
- K Hirai
- Okayama University, Pediatrics, Okayama, Japan
| | - K Baba
- Okayama University, Pediatrics, Okayama, Japan
| | - T Goto
- Okayama University Hospital, Cardiovascular Surgery, Okayama, Japan
| | - D Ousaka
- Okayama University Hospital, Cardiovascular Surgery, Okayama, Japan
| | - H Oh
- Okayama University Hospital, Regenerative Medicine, Center for Innovative Clinical Medicine, Okayama, Japan
| | - S Kasahara
- Okayama University Hospital, Cardiovascular Surgery, Okayama, Japan
| | - S Ohtsuki
- Okayama University, Pediatrics, Okayama, Japan
| |
Collapse
|
16
|
Murayama H, Sato Y, Kurihara R, Kasahara S, Mizukami Y, Kasahara Y, Uchiyama H, Yamamoto A, Moon EG, Cai J, Freyermuth J, Greven M, Shibauchi T, Matsuda Y. Diagonal nematicity in the pseudogap phase of HgBa 2CuO 4+δ. Nat Commun 2019; 10:3282. [PMID: 31337758 PMCID: PMC6650423 DOI: 10.1038/s41467-019-11200-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Accepted: 06/27/2019] [Indexed: 11/09/2022] Open
Abstract
The pseudogap phenomenon in the cuprates is arguably the most mysterious puzzle in the field of high-temperature superconductivity. The tetragonal cuprate HgBa2CuO4+δ, with only one CuO2 layer per primitive cell, is an ideal system to tackle this puzzle. Here, we measure the magnetic susceptibility anisotropy within the CuO2 plane with exceptionally high-precision magnetic torque experiments. Our key finding is that a distinct two-fold in-plane anisotropy sets in below the pseudogap temperature T*, which provides thermodynamic evidence for a nematic phase transition with broken four-fold symmetry. Surprisingly, the nematic director orients along the diagonal direction of the CuO2 square lattice, in sharp contrast to the bond nematicity along the Cu-O-Cu direction. Another remarkable feature is that the enhancement of the diagonal nematicity with decreasing temperature is suppressed around the temperature at which short-range charge-density-wave formation occurs. Our result suggests a competing relationship between diagonal nematic and charge-density-wave order in HgBa2CuO4+δ.
Collapse
Affiliation(s)
- H Murayama
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Sato
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - R Kurihara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Mizukami
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - Y Kasahara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - H Uchiyama
- Materials Dynamics Laboratory, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan.,Research and Utilization Division, Japan Synchrotron Radiation Research Institute (SPring-8/JASRI), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - A Yamamoto
- Graduate School of Engineering and Science, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo, 135-8584, Japan
| | - E-G Moon
- Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - J Cai
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA.,Physics Department, University of Maryland, College Park, MD, 20742-4111, USA
| | - J Freyermuth
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA.,Department of Physics, The Ohio State University, Columbus, OH, 43210-1117, USA
| | - M Greven
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan.
| |
Collapse
|
17
|
Kuwayama T, Matsuura K, Mizukami Y, Kasahara S, Matsuda Y, Shibauchi T, Uwatoko Y, Fujiwara N. Pressure-induced Lifshitz transition in FeSe$_{0.88}$S$_{0.12}$ probed via $^{77}$Se-NMR. Pap Phys 2019. [DOI: 10.4279/pip.110003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
Recently, FeSe$_{1-x}$S$_x$ systems have received much attention because of the unique pressure-temperature phase diagram. We performed $^{77}$Se-NMR measurements on a single crystal of FeSe$_{0.88}$S$_{0.12}$ to investigate its microscopic properties. The shift of $^{77}$Se spectra exhibits anomalous enhancement at $1.0~\mathrm{GPa}$, suggesting a topological change in the Fermi surfaces, so-called Lifshitz transition, occurs at $1.0~\mathrm{GPa}$. The magnetic fluctuation simultaneously changes its properties, which implies a change in the dominant nesting vector.
Edited by: A. Goñi, A. Cantarero, J. S. Reparaz
Collapse
|
18
|
Shimojima T, Suzuki Y, Nakamura A, Mitsuishi N, Kasahara S, Shibauchi T, Matsuda Y, Ishida Y, Shin S, Ishizaka K. Ultrafast nematic-orbital excitation in FeSe. Nat Commun 2019; 10:1946. [PMID: 31036846 PMCID: PMC6488589 DOI: 10.1038/s41467-019-09869-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2018] [Accepted: 03/30/2019] [Indexed: 11/24/2022] Open
Abstract
The electronic nematic phase is an unconventional state of matter that spontaneously breaks the rotational symmetry of electrons. In iron-pnictides/chalcogenides and cuprates, the nematic ordering and fluctuations have been suggested to have as-yet-unconfirmed roles in superconductivity. However, most studies have been conducted in thermal equilibrium, where the dynamical property and excitation can be masked by the coupling with the lattice. Here we use femtosecond optical pulse to perturb the electronic nematic order in FeSe. Through time-, energy-, momentum- and orbital-resolved photo-emission spectroscopy, we detect the ultrafast dynamics of electronic nematicity. In the strong-excitation regime, through the observation of Fermi surface anisotropy, we find a quick disappearance of the nematicity followed by a heavily-damped oscillation. This short-life nematicity oscillation is seemingly related to the imbalance of Fe 3dxz and dyz orbitals. These phenomena show critical behavior as a function of pump fluence. Our real-time observations reveal the nature of the electronic nematic excitation instantly decoupled from the underlying lattice. Several experiments have shown evidence for unusual nematic electronic behaviour in unconventional superconductors. Here the authors use pump-probe spectroscopy to observe out-of-equilibrium behaviour of coupled nematic-orbital excitations in iron selenide.
Collapse
Affiliation(s)
- T Shimojima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan. .,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan.
| | - Y Suzuki
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - A Nakamura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - N Mitsuishi
- Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa, 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto, 606-8502, Japan
| | - Y Ishida
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, 277-8581, Japan
| | - S Shin
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, 277-8581, Japan
| | - K Ishizaka
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.,Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| |
Collapse
|
19
|
Hanaguri T, Kasahara S, Böker J, Eremin I, Shibauchi T, Matsuda Y. Quantum Vortex Core and Missing Pseudogap in the Multiband BCS-BEC Crossover Superconductor FeSe. Phys Rev Lett 2019; 122:077001. [PMID: 30848633 DOI: 10.1103/physrevlett.122.077001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Indexed: 06/09/2023]
Abstract
FeSe is argued as a superconductor in the Bardeen-Cooper-Schrieffer Bose-Einstein condensation crossover regime where the superconducting gap size and the superconducting transition temperature T_{c} are comparable to the Fermi energy. In this regime, vortex bound states should be well quantized and the preformed pairs above T_{c} may yield a pseudogap in the quasiparticle-excitation spectrum. We performed spectroscopic-imaging scanning tunneling microscopy to search for these features. We found Friedel-like oscillations near the vortex, which manifest the quantized levels, whereas the pseudogap was not detected. These apparently conflicting observations may be related to the multiband nature of FeSe.
Collapse
Affiliation(s)
- T Hanaguri
- RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - J Böker
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
| | - I Eremin
- Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany
- National University of Science and Technology MISiS, 119049 Moscow, Russia
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| |
Collapse
|
20
|
Aoyanagi H, Sakata Y, Nochioka K, Shiroto T, Oikawa T, Abe R, Kasahara S, Sato M, Takahashi J, Miyata S, Shimokawa H. P1801Impact of temporal changes in left ventricular ejection fraction in patients at risk for heart failure. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- H Aoyanagi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - Y Sakata
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K Nochioka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T Shiroto
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T Oikawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - R Abe
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Kasahara
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M Sato
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - J Takahashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S Miyata
- Tohoku University Graduate School of Medicine, Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | - H Shimokawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine and Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | | |
Collapse
|
21
|
Kimura Y, Nakano M, Sakata Y, Nochioka K, Hasebe Y, Abe R, Chiba T, Fukasawa K, Oikawa T, Kasahara S, Miki K, Sato M, Shiroto T, Miyata S, Shimokawa H. 4376Clinical impacts of wide ORS morphologies on deterioration of left ventricular ejection fraction and fatal arrhythmias in patients with relatively preserved left ventricular ejection function. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.4376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y Kimura
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - M Nakano
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - Y Sakata
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - K Nochioka
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - Y Hasebe
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - R Abe
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - T Chiba
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - K Fukasawa
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - T Oikawa
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - S Kasahara
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - K Miki
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - M Sato
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - T Shiroto
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| | - S Miyata
- Tohoku University Graduate School of Medicine, Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | - H Shimokawa
- Tohoku University Graduate School of Medicine, Cardiovascular Medicine, Sendai, Japan
| |
Collapse
|
22
|
Kasahara S, Miyoshi Y, Yokota S, Mitani T, Kasahara Y, Matsuda S, Kumamoto A, Matsuoka A, Kazama Y, Frey HU, Angelopoulos V, Kurita S, Keika K, Seki K, Shinohara I. Pulsating aurora from electron scattering by chorus waves. Nature 2018; 554:337-340. [PMID: 29446380 DOI: 10.1038/nature25505] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 12/21/2017] [Indexed: 11/09/2022]
Abstract
Auroral substorms, dynamic phenomena that occur in the upper atmosphere at night, are caused by global reconfiguration of the magnetosphere, which releases stored solar wind energy. These storms are characterized by auroral brightening from dusk to midnight, followed by violent motions of distinct auroral arcs that suddenly break up, and the subsequent emergence of diffuse, pulsating auroral patches at dawn. Pulsating aurorae, which are quasiperiodic, blinking patches of light tens to hundreds of kilometres across, appear at altitudes of about 100 kilometres in the high-latitude regions of both hemispheres, and multiple patches often cover the entire sky. This auroral pulsation, with periods of several to tens of seconds, is generated by the intermittent precipitation of energetic electrons (several to tens of kiloelectronvolts) arriving from the magnetosphere and colliding with the atoms and molecules of the upper atmosphere. A possible cause of this precipitation is the interaction between magnetospheric electrons and electromagnetic waves called whistler-mode chorus waves. However, no direct observational evidence of this interaction has been obtained so far. Here we report that energetic electrons are scattered by chorus waves, resulting in their precipitation. Our observations were made in March 2017 with a magnetospheric spacecraft equipped with a high-angular-resolution electron sensor and electromagnetic field instruments. The measured quasiperiodic precipitating electron flux was sufficiently intense to generate a pulsating aurora, which was indeed simultaneously observed by a ground auroral imager.
Collapse
Affiliation(s)
- S Kasahara
- Department of Earth and Planetary Science, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Y Miyoshi
- Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, 24105 Nagoya, Aichi, Japan
| | - S Yokota
- Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, Japan
| | - T Mitani
- Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan
| | - Y Kasahara
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, Japan
| | - S Matsuda
- Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, 24105 Nagoya, Aichi, Japan
| | - A Kumamoto
- Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578 Japan
| | - A Matsuoka
- Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan
| | - Y Kazama
- Academia Sinica Institute of Astronomy and Astrophysics, 11F Astronomy-Mathematics Building, AS/NTU, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - H U Frey
- Space Sciences Laboratory, University of California, Berkeley, California 94720-7450, USA
| | - V Angelopoulos
- Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, California 90095-1567, USA
| | - S Kurita
- Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, 24105 Nagoya, Aichi, Japan
| | - K Keika
- Department of Earth and Planetary Science, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - K Seki
- Department of Earth and Planetary Science, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - I Shinohara
- Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan
| |
Collapse
|
23
|
Matsuura K, Mizukami Y, Arai Y, Sugimura Y, Maejima N, Machida A, Watanuki T, Fukuda T, Yajima T, Hiroi Z, Yip KY, Chan YC, Niu Q, Hosoi S, Ishida K, Mukasa K, Kasahara S, Cheng JG, Goh SK, Matsuda Y, Uwatoko Y, Shibauchi T. Maximizing T c by tuning nematicity and magnetism in FeSe 1-x S x superconductors. Nat Commun 2017; 8:1143. [PMID: 29070845 PMCID: PMC5656606 DOI: 10.1038/s41467-017-01277-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 09/04/2017] [Indexed: 11/13/2022] Open
Abstract
A fundamental issue concerning iron-based superconductivity is the roles of electronic nematicity and magnetism in realising high transition temperature (T c). To address this issue, FeSe is a key material, as it exhibits a unique pressure phase diagram involving non-magnetic nematic and pressure-induced antiferromagnetic ordered phases. However, as these two phases in FeSe have considerable overlap, how each order affects superconductivity remains perplexing. Here we construct the three-dimensional electronic phase diagram, temperature (T) against pressure (P) and isovalent S-substitution (x), for FeSe1-x S x . By simultaneously tuning chemical and physical pressures, against which the chalcogen height shows a contrasting variation, we achieve a complete separation of nematic and antiferromagnetic phases. In between, an extended non-magnetic tetragonal phase emerges, where T c shows a striking enhancement. The completed phase diagram uncovers that high-T c superconductivity lies near both ends of the dome-shaped antiferromagnetic phase, whereas T c remains low near the nematic critical point.
Collapse
Affiliation(s)
- K Matsuura
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - Y Mizukami
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - Y Arai
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - Y Sugimura
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - N Maejima
- Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, Sayo, Hyogo, 679-5148, Japan
| | - A Machida
- Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, Sayo, Hyogo, 679-5148, Japan
| | - T Watanuki
- Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Science and Technology, Sayo, Hyogo, 679-5148, Japan
| | - T Fukuda
- Materials Sciences Research Center, Japan Atomic Energy Agency (SPring-8/JAEA), Sayo, Hyogo, 679-5148, Japan
| | - T Yajima
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Z Hiroi
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - K Y Yip
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Y C Chan
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Q Niu
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - S Hosoi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - K Ishida
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - K Mukasa
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan
| | - S Kasahara
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - J-G Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - S K Goh
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Y Matsuda
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Y Uwatoko
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - T Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba, 277-8561, Japan.
| |
Collapse
|
24
|
Sano T, Ishigami S, Ousaka D, Hirai K, Goto T, Kasahara S, Ohtsuki S, Sano S, Oh H. P4242Transcoronary cardiac progenitors in patients with functional single ventricle: two-year follow-up of the phase 1/2 clinical trials. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
25
|
Goto T, Ousaka D, Sano T, Hirai K, Kasahara S, Oh H. P6319Novel swine models of single systemic ventricle for stem cell therapy in univentricular heart application. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p6319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
26
|
Kasahara S, Sakata Y, Nochioka K, Tsuji K, Abe R, Oikawa T, Sato M, Shiroto T, Takahashi J, Miyata S, Shimokawa H. P3384Development of a simple risk score to predict mortality of patients with chronic heart failure with preserved ejection fraction. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S. Kasahara
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - Y. Sakata
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K. Nochioka
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - K. Tsuji
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - R. Abe
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T. Oikawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - M. Sato
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - T. Shiroto
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - J. Takahashi
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine, Sendai, Japan
| | - S. Miyata
- Tohoku University Graduate School of Medicine, Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | - H. Shimokawa
- Tohoku University Graduate School of Medicine, Department of Cardiovascular Medicine and Department of Evidence-based Cardiovascular Medicine, Sendai, Japan
| | | |
Collapse
|
27
|
Kasahara S, Katayama K, Fujiki T, Ishikawa S, Fukada S, Nishikawa M. A Study on Carbon and Hydrogen Co-Deposition Behavior in Methane-Hydrogen Mixed Plasma. Fusion Science and Technology 2017. [DOI: 10.13182/fst11-a12713] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Kasahara
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| | - K. Katayama
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| | - T. Fujiki
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| | - S. Ishikawa
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| | - S. Fukada
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| | - M. Nishikawa
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, Fukuoka, Japan Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581 Japan
| |
Collapse
|
28
|
Tanaka O, Saitake T, Takahashi T, Takayoshi I, Kasahara S, Goto H. Low dose palliative radiotherapy for refractory aggressive lymphoma. Eur J Cancer 2017. [DOI: 10.1016/s0959-8049(17)30404-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
29
|
Sun JP, Matsuura K, Ye GZ, Mizukami Y, Shimozawa M, Matsubayashi K, Yamashita M, Watashige T, Kasahara S, Matsuda Y, Yan JQ, Sales BC, Uwatoko Y, Cheng JG, Shibauchi T. Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe. Nat Commun 2016; 7:12146. [PMID: 27431724 PMCID: PMC4960320 DOI: 10.1038/ncomms12146] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 06/05/2016] [Indexed: 11/24/2022] Open
Abstract
The coexistence and competition between superconductivity and electronic orders, such as spin or charge density waves, have been a central issue in high transition-temperature (Tc) superconductors. Unlike other iron-based superconductors, FeSe exhibits nematic ordering without magnetism whose relationship with its superconductivity remains unclear. Moreover, a pressure-induced fourfold increase of Tc has been reported, which poses a profound mystery. Here we report high-pressure magnetotransport measurements in FeSe up to ∼15 GPa, which uncover the dome shape of magnetic phase superseding the nematic order. Above ∼6 GPa the sudden enhancement of superconductivity (Tc≤38.3 K) accompanies a suppression of magnetic order, demonstrating their competing nature with very similar energy scales. Above the magnetic dome, we find anomalous transport properties suggesting a possible pseudogap formation, whereas linear-in-temperature resistivity is observed in the normal states of the high-Tc phase above 6 GPa. The obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-Tc cuprates.
Collapse
Affiliation(s)
- J. P. Sun
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - K. Matsuura
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - G. Z. Ye
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Science and Technology, Yunnan University, Kunming 650091, China
| | - Y. Mizukami
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - M. Shimozawa
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - K. Matsubayashi
- Department of Engineering Science, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
| | - M. Yamashita
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - T. Watashige
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - S. Kasahara
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Y. Matsuda
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - J. -Q. Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - B. C. Sales
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y. Uwatoko
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - J. -G. Cheng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - T. Shibauchi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| |
Collapse
|
30
|
Watson MD, Yamashita T, Kasahara S, Knafo W, Nardone M, Béard J, Hardy F, McCollam A, Narayanan A, Blake SF, Wolf T, Haghighirad AA, Meingast C, Schofield AJ, V Löhneysen H, Matsuda Y, Coldea AI, Shibauchi T. Publisher's Note: Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields [Phys. Rev. Lett. 115, 027006 (2015)]. Phys Rev Lett 2015; 115:219902. [PMID: 26636880 DOI: 10.1103/physrevlett.115.219902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Indexed: 06/05/2023]
|
31
|
Sato Y, Maeda Y, Minami H, Yasukawa Y, Yamamoto K, Tamamura H, Shibata S, Bou S, Sasaki M, Tameshige Y, Ooto H, Kasahara S, Shimizu Y, Saga Y, Omoya A, Saito M, Aoyama M. Daily Dose Evaluation Utilizing In-Room Computed Tomography Positioning System for Prostate Cancer Treatment in Proton Therapy. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
32
|
Tachi T, Yasuda M, Usui K, Umeda M, Nagaya K, Osawa T, Ichihashi A, Noguchi Y, Goto H, Kasahara S, Takahashi T, Goto C, Teramachi H. Risk factors for developing infusion reaction after rituximab administration in patients with B-cell non-Hodgkin's lymphoma. Pharmazie 2015; 70:674-677. [PMID: 26601425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Rituximab (RTX), a monoclonal antibody against CD20, is known to cause fewer side effects than conventional anti-cancer drugs; however, infusion reaction (IR), which is specific to monoclonal antibody therapy, is frequently triggered by RTX. Therefore, we designed this study to identify risk factors based on clinical test values for developing IR after RTX administration. Eighty-nine patients with B-cell non-Hodgkin's lymphoma who had received RTX for the first time between February 2010 and March 2013, at the Gifu Municipal Hospital were enrolled as subjects. Analysis of data was conducted for 87 patients, after excluding patients whose data were missing. Univariate analysis showed significant differences in the number of patients exhibiting a soluble interleukin-2 receptor (sLL-2R) level > 2,000 U/L and hemoglobin (Hb) < lower standard limit (LSL) between the IR and non-IR groups. Multivariate analysis showed significant differences with respect to slL-2R > 2,000 U/L [odds ratio (OR), 4.463; 95% confidence interval (Cl), 1.262-15.779; P = 0.020], Hb < LSL [OR, 3.568; 95% CI, 1.071-11.890; P = 0.038], and steroid administration [OR, 0.284; 95% Cl, 0.094-0.852; P = 0.025]. Our findings show that sIL-2R > 2,000 U/L, Hb < LSL, and a lack of steroid premedication are risk factors for developing IR following RTX treatment.
Collapse
|
33
|
Saito H, Kasahara S, Yamanaka M, Chiba T. Changes in postural control during a repetitive reaching task. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
34
|
Ortenzi L, Gretarsson H, Kasahara S, Matsuda Y, Shibauchi T, Finkelstein KD, Wu W, Julian SR, Kim YJ, Mazin II, Boeri L. Structural origin of the anomalous temperature dependence of the local magnetic moments in the CaFe2As2 family of materials. Phys Rev Lett 2015; 114:047001. [PMID: 25679903 DOI: 10.1103/physrevlett.114.047001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Indexed: 06/04/2023]
Abstract
We report a combination of Fe Kβ x-ray emission spectroscopy and density functional reduced Stoner theory calculations to investigate the correlation between structural and magnetic degrees of freedom in CaFe2(As1-xPx)2. The puzzling temperature behavior of the local moment found in rare earth-doped CaFe2As2 [H. Gretarsson et al., Phys. Rev. Lett. 110, 047003 (2013)] is also observed in CaFe2(As1-xPx)2. We explain this phenomenon based on first-principles calculations with scaled magnetic interaction. One scaling parameter is sufficient to describe quantitatively the magnetic moments in both CaFe2(As1-xPx)2 (x=0.055) and Ca0.78La0.22Fe2As2 at all temperatures. The anomalous growth of the local moments with increasing temperature can be understood from the observed large thermal expansion of the c-axis lattice parameter combined with strong magnetoelastic coupling. These effects originate from the strong tendency to form As-As dimers across the Ca layer in the CaFe2As2 family of materials. Our results emphasize the dual local-itinerant character of magnetism in Fe pnictides.
Collapse
Affiliation(s)
- L Ortenzi
- Institute for Complex Systems (ISC-CNR), c/o Dipartimento di Fisica, Università "La Sapienza", Piazzale Aldo Moro, n. 5, 00185 Rome, Italy and Max-Planck-Institut für Festkörperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany
| | - H Gretarsson
- Max-Planck-Institut für Festkörperforschung, Heisenbergstraβe 1, D-70569 Stuttgart, Germany and Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada
| | - S Kasahara
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan and Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - K D Finkelstein
- Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, USA
| | - W Wu
- Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada
| | - S R Julian
- Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada
| | - Young-June Kim
- Department of Physics, University of Toronto, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada
| | - I I Mazin
- Code 6390, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA
| | - L Boeri
- Institute for Theoretical and Computational Physics, TU Graz, Petersgasse 16, 8010 Graz, Austria
| |
Collapse
|
35
|
Putzke C, Walmsley P, Fletcher JD, Malone L, Vignolles D, Proust C, Badoux S, See P, Beere HE, Ritchie DA, Kasahara S, Mizukami Y, Shibauchi T, Matsuda Y, Carrington A. Anomalous critical fields in quantum critical superconductors. Nat Commun 2014; 5:5679. [PMID: 25477044 PMCID: PMC4268691 DOI: 10.1038/ncomms6679] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 10/28/2014] [Indexed: 11/22/2022] Open
Abstract
Fluctuations around an antiferromagnetic quantum critical point (QCP) are believed to lead to unconventional superconductivity and in some cases to high-temperature superconductivity. However, the exact mechanism by which this occurs remains poorly understood. The iron-pnictide superconductor BaFe2(As1−xPx)2 is perhaps the clearest example to date of a high-temperature quantum critical superconductor, and so it is a particularly suitable system to study how the quantum critical fluctuations affect the superconducting state. Here we show that the proximity of the QCP yields unexpected anomalies in the superconducting critical fields. We find that both the lower and upper critical fields do not follow the behaviour, predicted by conventional theory, resulting from the observed mass enhancement near the QCP. Our results imply that the energy of superconducting vortices is enhanced, possibly due to a microscopic mixing of antiferromagnetism and superconductivity, suggesting that a highly unusual vortex state is realized in quantum critical superconductors. Superconductivity in the iron pnictides is believed to be related to quantum critical fluctuations. Putzke et al. observe unexpected anomalies in the critical fields of BaFe2(As1−xPx)2 that emerge close to its magnetic critical point, which they argue is a generic feature of quantum critical superconductivity.
Collapse
Affiliation(s)
- C Putzke
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
| | - P Walmsley
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
| | - J D Fletcher
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK
| | - L Malone
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
| | - D Vignolles
- Laboratoire National des Champs Magnétiques Intenses (CNRS-INSA-UJF-UPS), 31400 Toulouse, France
| | - C Proust
- Laboratoire National des Champs Magnétiques Intenses (CNRS-INSA-UJF-UPS), 31400 Toulouse, France
| | - S Badoux
- Laboratoire National des Champs Magnétiques Intenses (CNRS-INSA-UJF-UPS), 31400 Toulouse, France
| | - P See
- National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK
| | - H E Beere
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
| | - D A Ritchie
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
| | - S Kasahara
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Y Mizukami
- 1] Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan [2] Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T Shibauchi
- 1] Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan [2] Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - A Carrington
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK
| |
Collapse
|
36
|
Yoshida T, Ideta S, Shimojima T, Malaeb W, Shinada K, Suzuki H, Nishi I, Fujimori A, Ishizaka K, Shin S, Nakashima Y, Anzai H, Arita M, Ino A, Namatame H, Taniguchi M, Kumigashira H, Ono K, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Nakajima M, Uchida S, Tomioka Y, Ito T, Kihou K, Lee CH, Iyo A, Eisaki H, Ikeda H, Arita R, Saito T, Onari S, Kontani H. Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As(1-x)P(x))2. Sci Rep 2014; 4:7292. [PMID: 25465027 PMCID: PMC4252890 DOI: 10.1038/srep07292] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 11/14/2014] [Indexed: 11/22/2022] Open
Abstract
We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe2(As1-xPx)2 (x = 0.30, Tc = 30 K). Strongly anisotropic gap has been found only in the electron Fermi surface while the gap on the entire hole Fermi surfaces are nearly isotropic. These results are inconsistent with horizontal nodes but are consistent with modified s± gap with nodal loops. We have shown that the complicated gap modulation can be theoretically reproduced by considering both spin and orbital fluctuations.
Collapse
Affiliation(s)
- T Yoshida
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - S Ideta
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Shimojima
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - W Malaeb
- Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - K Shinada
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - H Suzuki
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - I Nishi
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - A Fujimori
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - K Ishizaka
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - S Shin
- Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Nakashima
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - H Anzai
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - M Arita
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - A Ino
- Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
| | - H Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - M Taniguchi
- 1] Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan [2] Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
| | - H Kumigashira
- KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
| | - K Ono
- KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan
| | - S Kasahara
- 1] Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Shibauchi
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - T Terashima
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan
| | - Y Matsuda
- Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - M Nakajima
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - S Uchida
- 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan
| | - Y Tomioka
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - T Ito
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - K Kihou
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - C H Lee
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - A Iyo
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - H Eisaki
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - H Ikeda
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan
| | - R Arita
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - T Saito
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - S Onari
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| | - H Kontani
- 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
| |
Collapse
|
37
|
Mizukami Y, Konczykowski M, Kawamoto Y, Kurata S, Kasahara S, Hashimoto K, Mishra V, Kreisel A, Wang Y, Hirschfeld PJ, Matsuda Y, Shibauchi T. Disorder-induced topological change of the superconducting gap structure in iron pnictides. Nat Commun 2014; 5:5657. [PMID: 25430419 DOI: 10.1038/ncomms6657] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 10/24/2014] [Indexed: 11/09/2022] Open
|
38
|
Tonegawa S, Kasahara S, Fukuda T, Sugimoto K, Yasuda N, Tsuruhara Y, Watanabe D, Mizukami Y, Haga Y, Matsuda TD, Yamamoto E, Onuki Y, Ikeda H, Matsuda Y, Shibauchi T. Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2. Nat Commun 2014; 5:4188. [PMID: 24943003 DOI: 10.1038/ncomms5188] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 05/22/2014] [Indexed: 11/09/2022] Open
|
39
|
Yanagisawa R, Sugaya Y, Kasahara S, Omachi S. Tooth shape reconstruction from dental CT images with the region-growing method. Dentomaxillofac Radiol 2014; 43:20140080. [PMID: 24786137 DOI: 10.1259/dmfr.20140080] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES The three-dimensional shape information of teeth provides useful information. However, obtaining accurate three-dimensional shapes of teeth is difficult without extracting them physically. In this study, we aimed to develop a method for automatically extracting accurate three-dimensional shapes of teeth from dental CT images. METHODS The proposed method includes pre-processing and region extraction. Pre-processing is a combination of image-processing techniques that enhances tooth regions. In the region-extraction process, the region-growing method is introduced for extracting a region of each tooth. Constraint conditions determined by considering the characteristics of the structure of teeth are introduced for accurate extraction. Finally, morphological image processing is applied for eliminating discontinuous points. RESULTS We carried out an experiment in which the three-dimensional shapes of teeth were reconstructed from dental CT images. Quantitative evaluation was performed by measuring the three-dimensional spatial accordance rates between the region obtained by the proposed method and the manually extracted region. The proposed method was significantly more accurate than an existing method at the 5% level. CONCLUSIONS The experimental results showed that the proposed method reconstructs the shapes of teeth with high precision. However, an unextracted region remained at the surface of the enamel. Solving this problem and improving the extraction accuracy are important topics for future work.
Collapse
Affiliation(s)
- R Yanagisawa
- 1 Graduate School of Engineering, Tohoku University, Sendai, Japan
| | | | | | | |
Collapse
|
40
|
Kasahara S, Kamio E, Yoshizumi A, Matsuyama H. Polymeric ion-gels containing an amino acid ionic liquid for facilitated CO2transport media. Chem Commun (Camb) 2014; 50:2996-9. [DOI: 10.1039/c3cc48231f] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
41
|
Yamada T, Tsurumi H, Kitagawa J, Kanemura N, Goto N, Kasahara S, Goto H, Fukuno K, Sawada M, Moriwaki H. Bendamustine Therapy for Relapsed or Refractory Low Grade B-Cell Lymphoma and Mantle Cell Lymphoma. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
42
|
Walmsley P, Putzke C, Malone L, Guillamón I, Vignolles D, Proust C, Badoux S, Coldea AI, Watson MD, Kasahara S, Mizukami Y, Shibauchi T, Matsuda Y, Carrington A. Quasiparticle mass enhancement close to the quantum critical point in BaFe2(As(1-x)P(x))2. Phys Rev Lett 2013; 110:257002. [PMID: 23829753 DOI: 10.1103/physrevlett.110.257002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 05/10/2013] [Indexed: 06/02/2023]
Abstract
We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe2(As(1-x)P(x))2. Our data when combined with results for the magnetic penetration depth give compelling evidence for the existence of a quantum critical point close to x=0.30 which affects the majority of the Fermi surface by enhancing the quasiparticle mass. The results show that the sharp peak in the inverse superfluid density seen in this system results from a strong increase in the quasiparticle mass at the quantum critical point.
Collapse
Affiliation(s)
- P Walmsley
- H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Badman SV, Andrews DJ, Cowley SWH, Lamy L, Provan G, Tao C, Kasahara S, Kimura T, Fujimoto M, Melin H, Stallard T, Brown RH, Baines KH. Rotational modulation and local time dependence of Saturn's infrared H3+auroral intensity. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012ja017990] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
44
|
Hashimoto K, Cho K, Shibauchi T, Kasahara S, Mizukami Y, Katsumata R, Tsuruhara Y, Terashima T, Ikeda H, Tanatar MA, Kitano H, Salovich N, Giannetta RW, Walmsley P, Carrington A, Prozorov R, Matsuda Y. A sharp peak of the zero-temperature penetration depth at optimal composition in BaFe2(As(1-x)P(x))2. Science 2012; 336:1554-7. [PMID: 22723416 DOI: 10.1126/science.1219821] [Citation(s) in RCA: 243] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
In a superconductor, the ratio of the carrier density, n, to its effective mass, m*, is a fundamental property directly reflecting the length scale of the superfluid flow, the London penetration depth, λ(L). In two-dimensional systems, this ratio n/m* (~1/λ(L)(2)) determines the effective Fermi temperature, T(F). We report a sharp peak in the x-dependence of λ(L) at zero temperature in clean samples of BaFe(2)(As(1)(-x)P(x))(2) at the optimum composition x = 0.30, where the superconducting transition temperature T(c) reaches a maximum of 30 kelvin. This structure may arise from quantum fluctuations associated with a quantum critical point. The ratio of T(c)/T(F) at x = 0.30 is enhanced, implying a possible crossover toward the Bose-Einstein condensate limit driven by quantum criticality.
Collapse
Affiliation(s)
- K Hashimoto
- Department of Physics, Kyoto University, Kyoto, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
45
|
Moon SJ, Schafgans AA, Kasahara S, Shibauchi T, Terashima T, Matsuda Y, Tanatar MA, Prozorov R, Thaler A, Canfield PC, Sefat AS, Mandrus D, Basov DN. Infrared measurement of the pseudogap of P-doped and Co-doped high-temperature BaFe2As2 superconductors. Phys Rev Lett 2012; 109:027006. [PMID: 23030200 DOI: 10.1103/physrevlett.109.027006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Indexed: 06/01/2023]
Abstract
We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe2As2 family. Our experiments have identified hallmarks of the pseudogap state in the BaFe2As2 system that mirror the spectroscopic manifestations of the pseudogap in the cuprates. The magnitude of the infrared pseudogap is in accord with that of the spin-density-wave gap of the parent compound. By monitoring the superconducting gap of both P- and Co-doped compounds, we find that the infrared pseudogap is unrelated to superconductivity. The appearance of the pseudogap is found to correlate with the evolution of the antiferromagnetic fluctuations associated with the spin-density-wave instability. The strong-coupling analysis of infrared data further reveals the interdependence between the magnetism and the pseudogap in the iron pnictides.
Collapse
Affiliation(s)
- S J Moon
- Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Kasahara S. [Congenital heart disease having left to right shunts combined with pulmonary hypertension]. Kyobu Geka 2012; 65:660-664. [PMID: 22868424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A large population of patients with congenital heart disease with relevant systemic to pulmonary shunts( left to right shunts) will develop pulmonary arterial hypertension if left untreated. There are 2 different statuses of an increase in pulmonary arterial pressure. One is high resistance due to high pulmonary blood flow( high flow with high resistance), another one is low pulmonary flow due to high resistance( low flow with high resistance). Chronic large left-to-right shunt induced severe pulmonary vascular disease and pulmonary hypertension. This was then subsequence of low pulmonary blood flow with high pulmonary vascular resistance. We have to avoid this situation and have to do intervention while the pulmonary vascular reactivity has been left. Therefore accurate diagnosis, preoperative treatment for avoidance of high flow, appropriate timing of interventions and post operative various managements are important factors as aiming of low pulmonary resistance in this group. It is important to be familiar with.
Collapse
Affiliation(s)
- S Kasahara
- Department of Cardiovascular Surgery, Okayama University School of Medicine, Japan
| |
Collapse
|
47
|
Putzke C, Coldea AI, Guillamón I, Vignolles D, McCollam A, Leboeuf D, Watson MD, Mazin II, Kasahara S, Terashima T, Shibauchi T, Matsuda Y, Carrington A. de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs. Phys Rev Lett 2012; 108:047002. [PMID: 22400881 DOI: 10.1103/physrevlett.108.047002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Indexed: 05/31/2023]
Abstract
We report a de Haas-van Alphen oscillation study of the 111 iron pnictide superconductors LiFeAs with T(c) ≈ 18 K and LiFeP with T(c) ≈ 5 K. We find that for both compounds the Fermi surface topology is in good agreement with density functional band-structure calculations and has almost nested electron and hole bands. The effective masses generally show significant enhancement, up to ~3 for LiFeP and ~5 for LiFeAs. However, one hole Fermi surface in LiFeP shows a very small enhancement, as compared with its other sheets. This difference probably results from k-dependent coupling to spin fluctuations and may be the origin of the different nodal and nodeless superconducting gap structures in LiFeP and LiFeAs, respectively.
Collapse
Affiliation(s)
- C Putzke
- HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Hashimoto K, Kasahara S, Katsumata R, Mizukami Y, Yamashita M, Ikeda H, Terashima T, Carrington A, Matsuda Y, Shibauchi T. Nodal versus nodeless behaviors of the order parameters of LiFeP and LiFeAs superconductors from magnetic penetration-depth measurements. Phys Rev Lett 2012; 108:047003. [PMID: 22400882 DOI: 10.1103/physrevlett.108.047003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Indexed: 05/31/2023]
Abstract
High-precision measurements of magnetic penetration depth λ in clean single crystals of LiFeAs and LiFeP superconductors reveal contrasting behaviors. In LiFeAs the low-temperature λ(T) shows a flat dependence indicative of a fully gapped state, which is consistent with previous studies. In contrast, LiFeP exhibits a T-linear dependence of superfluid density infinity λ(-2), indicating a nodal superconducting order parameter. A systematic comparison of quasiparticle excitations in the 1111, 122, and 111 families of iron-pnictide superconductors implies that the nodal state is induced when the pnictogen height from the iron plane decreases below a threshold value of ~1.33 Å.
Collapse
Affiliation(s)
- K Hashimoto
- Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Badman SV, Achilleos N, Arridge CS, Baines KH, Brown RH, Bunce EJ, Coates AJ, Cowley SWH, Dougherty MK, Fujimoto M, Hospodarsky G, Kasahara S, Kimura T, Melin H, Mitchell DG, Stallard T, Tao C. Cassini observations of ion and electron beams at Saturn and their relationship to infrared auroral arcs. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011ja017222] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
50
|
Itoh H, Ichiba S, Ujike Y, Kasahara S, Arai S, Sano S. Extracorporeal membrane oxygenation following pediatric cardiac surgery: development and outcomes from a single-center experience. Perfusion 2012; 27:225-9. [DOI: 10.1177/0267659111434857] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Extracorporeal membrane oxygenation (ECMO) has emerged as an effective mechanical support following cardiac surgery with respiratory and cardiac failure. However, there are no clear indications for ECMO use after pediatric cardiac surgery. We retrospectively reviewed medical records of 76 pediatric patients [mean age, 10.8 months (0–86); mean weight, 5.16 kg (1.16–16.5)] with congenital heart disease who received ECMO following cardiac surgery between January 1997 and October 2010. Forty-five patients were treated with an aggressive ECMO approach (aggressive ECMO group, April 2005–October 2010) and 31 with a delayed ECMO approach (delayed ECMO group, January 1997–March 2005). Demographics, diagnosis, operative variables, ECMO indication, and duration of survivors and non-survivors were compared. Thirty-four patients (75.5%) were successfully weaned from ECMO in the aggressive ECMO group and 26 (57.7%) were discharged. Conversely, eight patients (25.8%) were successfully weaned from ECMO in the delayed ECMO group and two (6.5%) were discharged. Forty-five patients with shunted single ventricle physiology (aggressive: 29 patients, delayed: 16 patients) received ECMO, but only 15 (33.3%) survived and were discharged. The survival rate of the aggressive ECMO group was significantly better when compared with the delayed ECMO group (p<0.01). Also, ECMO duration was significantly shorter among the aggressive ECMO group survivors (96.5 ± 62.9 h, p<0.01). Thus, the aggressive ECMO approach is a superior strategy compared to the delayed ECMO approach in pediatric cardiac patients. The aggressive ECMO approach improved our outcomes of neonatal and pediatric ECMO.
Collapse
Affiliation(s)
- H Itoh
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
- Department of Emergency and Critical Care Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - S Ichiba
- Department of Community and Emergency Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Y Ujike
- Department of Emergency and Critical Care Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - S Kasahara
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - S Arai
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| | - S Sano
- Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan
| |
Collapse
|