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Safari C, Ghosh S, Andersson R, Johannesson J, Båth P, Uwangue O, Dahl P, Zoric D, Sandelin E, Vallejos A, Nango E, Tanaka R, Bosman R, Börjesson P, Dunevall E, Hammarin G, Ortolani G, Panman M, Tanaka T, Yamashita A, Arima T, Sugahara M, Suzuki M, Masuda T, Takeda H, Yamagiwa R, Oda K, Fukuda M, Tosha T, Naitow H, Owada S, Tono K, Nureki O, Iwata S, Neutze R, Brändén G. Time-resolved serial crystallography to track the dynamics of carbon monoxide in the active site of cytochrome c oxidase. Sci Adv 2023; 9:eadh4179. [PMID: 38064560 PMCID: PMC10708180 DOI: 10.1126/sciadv.adh4179] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 11/09/2023] [Indexed: 12/18/2023]
Abstract
Cytochrome c oxidase (CcO) is part of the respiratory chain and contributes to the electrochemical membrane gradient in mitochondria as well as in many bacteria, as it uses the energy released in the reduction of oxygen to pump protons across an energy-transducing biological membrane. Here, we use time-resolved serial femtosecond crystallography to study the structural response of the active site upon flash photolysis of carbon monoxide (CO) from the reduced heme a3 of ba3-type CcO. In contrast with the aa3-type enzyme, our data show how CO is stabilized on CuB through interactions with a transiently ordered water molecule. These results offer a structural explanation for the extended lifetime of the CuB-CO complex in ba3-type CcO and, by extension, the extremely high oxygen affinity of the enzyme.
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Affiliation(s)
- Cecilia Safari
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Swagatha Ghosh
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Rebecka Andersson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Jonatan Johannesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Petra Båth
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Owens Uwangue
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Peter Dahl
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Doris Zoric
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Emil Sandelin
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Adams Vallejos
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Eriko Nango
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rie Tanaka
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Robert Bosman
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Per Börjesson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Elin Dunevall
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Greger Hammarin
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Giorgia Ortolani
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Matthijs Panman
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Tomoyuki Tanaka
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Ayumi Yamashita
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Toshi Arima
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Michihiro Sugahara
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Mamoru Suzuki
- Laboratory of Supramolecular Crystallography, Research Center for Structural and Functional Proteomics, Institute for Protein Research, Osaka University, Osaka, Japan
| | - Tetsuya Masuda
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Japan
| | - Hanae Takeda
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
| | - Raika Yamagiwa
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
| | - Kazumasa Oda
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Masahiro Fukuda
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Takehiko Tosha
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Hisashi Naitow
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Shigeki Owada
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Kensuke Tono
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Osamu Nureki
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - So Iwata
- RIKEN SPring-8 Center, 1-1-1 Kuoto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Richard Neutze
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
| | - Gisela Brändén
- Department of Chemistry and Molecular Biology, University of Gothenburg, Box 462, SE-40530 Gothenburg, Sweden
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2
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Sawada Y, Kimura S, Watanabe K, Yamaguchi Y, Arima T, Kimura T. Nonreciprocal Directional Dichroism in Magnetoelectric Spin Glass. Phys Rev Lett 2022; 129:217201. [PMID: 36461975 DOI: 10.1103/physrevlett.129.217201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/29/2022] [Accepted: 10/18/2022] [Indexed: 06/17/2023]
Abstract
Optical absorption spectra in the visible and near-infrared light were measured for magnetoelectric spin glass Ni_{0.4}Mn_{0.6}TiO_{3} under various field-cooled conditions. Despite the absence of long-range magnetic-dipole order, this spin-glass system exhibits nonreciprocal directional dichroism (NDD) at zero external field after a magnetoelectric field-cooled procedure. This result is distinct from previous studies on NDD in systems with magnetic toroidal moments induced either by long-range magnetic-dipole order or by applying crossed electric and magnetic fields. The present Letter conclusively demonstrates that the observed NDD originates from magnetoelectrically induced ferroic order of magnetic toroidal moments without conventional magnetic-dipole order.
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Affiliation(s)
- Y Sawada
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - S Kimura
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - K Watanabe
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Y Yamaguchi
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
| | - T Arima
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T Kimura
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
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3
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Sakasegawa H, Nomura M, Sawayama K, Nakayama T, Yaita Y, Yonekawa H, Kobayashi N, Arima T, Hiyama T, Murata E. Liquid decontamination using acidic electrolyzed water for various uranium-contaminated steel surfaces in dismantled centrifuge. Progress in Nuclear Energy 2022. [DOI: 10.1016/j.pnucene.2022.104396] [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] [Indexed: 11/24/2022]
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4
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Yamada S, Sagayama H, Yamazaki M, Aoki H, Sugimoto K, Arima T. Physical properties and phase diagram of single crystal REBaMn2O6 (RE = Sm, Eu, Gd, Tb, Dy, and Y). J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123504] [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: 11/30/2022]
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5
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Murakawa T, Suzuki M, Arima T, Sugahara M, Tanaka T, Tanaka R, Iwata S, Nango E, Tono K, Hayashi H, Fukui K, Yano T, Tanizawa K, Okajima T. Microcrystal preparation for serial femtosecond X-ray crystallography of bacterial copper amine oxidase. Acta Crystallogr F Struct Biol Commun 2021; 77:356-363. [PMID: 34605440 PMCID: PMC8488853 DOI: 10.1107/s2053230x21008967] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/28/2021] [Indexed: 11/10/2022] Open
Abstract
Recent advances in serial femtosecond X-ray crystallography (SFX) using X-ray free-electron lasers have paved the way for determining radiation-damage-free protein structures under nonfreezing conditions. However, the large-scale preparation of high-quality microcrystals of uniform size is a prerequisite for SFX, and this has been a barrier to its widespread application. Here, a convenient method for preparing high-quality microcrystals of a bacterial quinoprotein enzyme, copper amine oxidase from Arthrobacter globiformis, is reported. The method consists of the mechanical crushing of large crystals (5-15 mm3), seeding the crushed crystals into the enzyme solution and standing for 1 h at an ambient temperature of ∼26°C, leading to the rapid formation of microcrystals with a uniform size of 3-5 µm. The microcrystals diffracted X-rays to a resolution beyond 2.0 Å in SFX measurements at the SPring-8 Angstrom Compact Free Electron Laser facility. The damage-free structure determined at 2.2 Å resolution was essentially identical to that determined previously by cryogenic crystallography using synchrotron X-ray radiation.
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Affiliation(s)
- Takeshi Murakawa
- Department of Biochemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
| | - Mamoru Suzuki
- Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Toshi Arima
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Michihiro Sugahara
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Tomoyuki Tanaka
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Rie Tanaka
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - So Iwata
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Yoshidakonoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Eriko Nango
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kensuke Tono
- SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Hideyuki Hayashi
- Department of Chemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
| | - Kenji Fukui
- Department of Biochemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
| | - Takato Yano
- Department of Biochemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
| | - Katsuyuki Tanizawa
- Institute of Scientific and Industrial Research (SANKEN), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Toshihide Okajima
- Department of Chemistry, Faculty of Medicine, Osaka Medical and Pharmaceutical University, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
- Institute of Scientific and Industrial Research (SANKEN), Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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6
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Yu XZ, Morikawa D, Nakajima K, Shibata K, Kanazawa N, Arima T, Nagaosa N, Tokura Y. Motion tracking of 80-nm-size skyrmions upon directional current injections. Sci Adv 2020; 6:eaaz9744. [PMID: 32596450 PMCID: PMC7299614 DOI: 10.1126/sciadv.aaz9744] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 05/05/2020] [Indexed: 05/29/2023]
Abstract
Nanometer-scale skyrmions are prospective candidates for information bits in low-power consumption devices owing to their topological nature and controllability with low current density. Studies on skyrmion dynamics in different classes of materials have exploited the topological Hall effect and current-driven fast motion of skyrmionic bubbles. However, the small current track motion of a single skyrmion and few-skyrmion aggregates remains elusive. Here, we report the tracking of creation and extinction and motion of 80-nm-size skyrmions upon directional one-current pulse excitations at low current density of the order of 109 A m-2 in designed devices with the notched hole. The Hall motion of a single skyrmion and the torque motions of few-skyrmion aggregates have been directly revealed. The results exemplify low-current density controls of skyrmions, which will pave the way for the application of skyrmions.
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Affiliation(s)
- X. Z. Yu
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - D. Morikawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - K. Nakajima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - K. Shibata
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - N. Kanazawa
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - T. Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - N. Nagaosa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
| | - Y. Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
- Tokyo College, University of Tokyo, Tokyo 113-8656, Japan
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7
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Yamada S, Abe N, Sagayama H, Ogawa K, Yamagami T, Arima T. Room-Temperature Low-Field Colossal Magnetoresistance in Double-Perovskite Manganite. Phys Rev Lett 2019; 123:126602. [PMID: 31633958 DOI: 10.1103/physrevlett.123.126602] [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: 01/11/2019] [Indexed: 06/10/2023]
Abstract
We have discovered room-temperature low-field colossal magnetoresistance (CMR) in an A-site ordered NdBaMn_{2}O_{6} crystal. The resistance changes more than 2 orders of magnitude at a magnetic field lower than 2 T near 300 K. When the temperature and magnetic field sweep from an insulating (metallic) phase to a metallic (insulating) phase, the insulating (metallic) conduction changes to the metallic (insulating) conduction within 1 K and 0.5 T, respectively. The CMR is ascribed to the melting of the charge and orbital ordering. The entropy change which is estimated from the B-T phase diagram is smaller than what is expected for the charge and orbital ordering. The suppression of the entropy change is attributable to the loss of the short-range ferromagnetic fluctuation of Mn spin moments, which is an important key of the high temperature and low magnetic field CMR effect.
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Affiliation(s)
- S Yamada
- Department of Materials System Science, Yokohama City University, Yokohama 236-0027, Japan
| | - N Abe
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - H Sagayama
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
- Department of Materials Structure Science, The Graduate University for Advanced Studies, Tsukuba, Ibaraki 305-0801, Japan
| | - K Ogawa
- Department of Materials System Science, Yokohama City University, Yokohama 236-0027, Japan
| | - T Yamagami
- Department of Materials System Science, Yokohama City University, Yokohama 236-0027, Japan
| | - T Arima
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
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8
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Abstract
In magnetoelectric materials, where the time-reversal and space-inversion symmetries are simultaneously broken, optical properties can differ between the opposite propagation directions of light. We report on an experimental observation of nonreciprocal trajectory of a light ray in magnetoelectric material CuB_{2}O_{4}. The light is refracted in different ways between the opposite propagation directions of light. We find a nonreciprocal refraction at the interface between a matter with macroscopic toroidal moment and vacuum. The resultant nonreciprocal deflection of the light is 0.005 deg, which is quantitatively explained using Fermat's principle.
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Affiliation(s)
- S Toyoda
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - N Abe
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - T Arima
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
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9
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Kocsis V, Nakajima T, Matsuda M, Kikkawa A, Kaneko Y, Takashima J, Kakurai K, Arima T, Kagawa F, Tokunaga Y, Tokura Y, Taguchi Y. Magnetization-polarization cross-control near room temperature in hexaferrite single crystals. Nat Commun 2019; 10:1247. [PMID: 30886147 PMCID: PMC6423030 DOI: 10.1038/s41467-019-09205-x] [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: 12/28/2018] [Accepted: 02/27/2019] [Indexed: 11/29/2022] Open
Abstract
Mutual control of the electricity and magnetism in terms of magnetic (H) and electric (E) fields, the magnetoelectric (ME) effect, offers versatile low power consumption alternatives to current data storage, logic gate, and spintronic devices. Despite its importance, E-field control over magnetization (M) with significant magnitude was observed only at low temperatures. Here we have successfully stabilized a simultaneously ferrimagnetic and ferroelectric phase in a Y-type hexaferrite single crystal up to 450 K, and demonstrated the reversal of large non-volatile M by E field close to room temperature. Manipulation of the magnetic domains by E field is directly visualized at room temperature by using magnetic force microscopy. The present achievement provides an important step towards the application of ME multiferroics. Mutual control of the electric polarization and magnetization promises for low power consumption spintronic devices but remains challenging. Here the authors show reversal of non-volatile magnetization by electric field as well as the polarization switching by magnetic field in a single-component material, close to room temperature.
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Affiliation(s)
- V Kocsis
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.
| | - T Nakajima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan
| | - M Matsuda
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - A Kikkawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan
| | - Y Kaneko
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan
| | - J Takashima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Engineering R & D Group, NGK Spark Plug Co., Ltd., Minato-ku, Tokyo, 108-8601, Japan
| | - K Kakurai
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki, 319-1106, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan
| | - F Kagawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Department of Applied Physics, University of Tokyo, Hongo, Tokyo, 113-8656, Japan
| | - Y Tokunaga
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Department of Advanced Materials Science, University of Tokyo, Kashiwa, 277-8561, Japan
| | - Y Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Department of Applied Physics, University of Tokyo, Hongo, Tokyo, 113-8656, Japan
| | - Y Taguchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.
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10
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Yamamoto S, Omi T, Akai H, Kubota Y, Takahashi Y, Suzuki Y, Hirata Y, Yamamoto K, Yukawa R, Horiba K, Yumoto H, Koyama T, Ohashi H, Owada S, Tono K, Yabashi M, Shigemasa E, Yamamoto S, Kotsugi M, Wadati H, Kumigashira H, Arima T, Shin S, Matsuda I. Element Selectivity in Second-Harmonic Generation of GaFeO_{3} by a Soft-X-Ray Free-Electron Laser. Phys Rev Lett 2018; 120:223902. [PMID: 29906133 DOI: 10.1103/physrevlett.120.223902] [Citation(s) in RCA: 6] [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: 10/21/2017] [Indexed: 05/27/2023]
Abstract
Nonlinear optical frequency conversion has been challenged to move down to the extreme ultraviolet and x-ray region. However, the extremely low signals have allowed researchers to only perform transmission experiments of the gas phase or ultrathin films. Here, we report second harmonic generation (SHG) of the reflected beam of a soft x-ray free-electron laser from a solid, which is enhanced by the resonant effect. The observation revealed that the double resonance condition can be met by absorption edges for transition metal oxides in the soft x-ray range, and this suggests that the resonant SHG technique can be applicable to a wide range of materials. We discuss the possibility of element-selective SHG spectroscopy measurements in the soft x-ray range.
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Affiliation(s)
- Sh Yamamoto
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - T Omi
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - H Akai
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Y Kubota
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Y Takahashi
- Tokyo University of Science, Katsushika 125-8585, Japan
| | - Y Suzuki
- Tokyo University of Science, Katsushika 125-8585, Japan
| | - Y Hirata
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - K Yamamoto
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - R Yukawa
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
| | - K Horiba
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
| | - H Yumoto
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - T Koyama
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - H Ohashi
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - S Owada
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - K Tono
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - M Yabashi
- RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - E Shigemasa
- UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
- Sokendai (the Graduate University for Advanced Studies), Okazaki 444- 8585, Japan
| | - S Yamamoto
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - M Kotsugi
- Tokyo University of Science, Katsushika 125-8585, Japan
| | - H Wadati
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - H Kumigashira
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
| | - T Arima
- Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - S Shin
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - I Matsuda
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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11
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Kamitani M, Bahramy MS, Nakajima T, Terakura C, Hashizume D, Arima T, Tokura Y. Superconductivity at the Polar-Nonpolar Phase Boundary of SnP with an Unusual Valence State. Phys Rev Lett 2017; 119:207001. [PMID: 29219367 DOI: 10.1103/physrevlett.119.207001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Indexed: 06/07/2023]
Abstract
Structural, magnetic, and electrical characterizations reveal that SnP with an unusual valence state (nominally Sn^{3+}) undergoes a ferroelectriclike structural transition from a simple NaCl-type structure to a polar tetragonal structure at approximately 250 K at ambient pressure. First-principles calculations indicate that the experimentally observed tetragonal distortion enhances the charge transfer from Sn to P, thereby making the polar tetragonal phase energetically more stable than the nonpolar cubic phase. Hydrostatic pressure is found to promptly suppress the structural phase transition in SnP, leading to the emergence of bulk superconductivity in a phase-competitive manner. These findings suggest that control of ferroelectriclike instability in a metal can be a promising way for creating novel superconductors.
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Affiliation(s)
- M Kamitani
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - M S Bahramy
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan
| | - T Nakajima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - C Terakura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - D Hashizume
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - Y Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan
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12
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Yokouchi T, Kanazawa N, Kikkawa A, Morikawa D, Shibata K, Arima T, Taguchi Y, Kagawa F, Tokura Y. Electrical magnetochiral effect induced by chiral spin fluctuations. Nat Commun 2017; 8:866. [PMID: 29021629 PMCID: PMC5636803 DOI: 10.1038/s41467-017-01094-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [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: 03/23/2017] [Accepted: 08/17/2017] [Indexed: 11/14/2022] Open
Abstract
Chirality of matter can produce unique responses in optics, electricity and magnetism. In particular, magnetic crystals transmit their handedness to the magnetism via antisymmetric exchange interaction of relativistic origin, producing helical spin orders as well as their fluctuations. Here we report for a chiral magnet MnSi that chiral spin fluctuations manifest themselves in the electrical magnetochiral effect, i.e. the nonreciprocal and nonlinear response characterized by the electrical resistance depending on inner product of current and magnetic field. Prominent electrical magnetochiral signals emerge at specific temperature-magnetic field-pressure regions: in the paramagnetic phase just above the helical ordering temperature and in the partially-ordered topological spin state at low temperatures and high pressures, where thermal and quantum spin fluctuations are conspicuous in proximity of classical and quantum phase transitions, respectively. The finding of the asymmetric electron scattering by chiral spin fluctuations may explore new electromagnetic functionality in chiral magnets. The magnetism-induced chirality in electron transportation is of fundamental importantance in condensed matter physics but the origin is still unclear. Here the authors demonstrate that the asymmetric electron scattering by chiral spin fluctuations can be the key to the electrical magnetochiral effect in MnSi.
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Affiliation(s)
- T Yokouchi
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan.
| | - N Kanazawa
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - A Kikkawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - D Morikawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - K Shibata
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.,Department of Advanced Materials Science, The University of Tokyo, Kashiwa, 277-8561, Japan
| | - Y Taguchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - F Kagawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - Y Tokura
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan. .,RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
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13
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Thomaston JL, Woldeyes RA, Nakane T, Koiwai K, Yamashita A, Tanaka T, Arima T, Kobayashi J, Masuda T, Suzuki M, Sugahara M, Tanaka R, Nango E, Iwata S, Yumoto F, Fraser JS, DeGrado WF. XFEL structures of the influenza M2 proton channel at 1.4 Å: room-temperature water networks and insights into proton conduction. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s0108767317099603] [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: 04/03/2023] Open
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14
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Nango E, Royant A, Kubo M, Nakane T, Wickstrand C, Kimura T, Tanaka T, Tono K, Song C, Tanaka R, Arima T, Yamashita A, Kobayashi J, Hosaka T, Mizohata E, Nogly P, Sugahara M, Nam D, Nomura T, Shimamura T, Im D, Fujiwara T, Yamanaka Y, Jeon B, Nishizawa T, Oda K, Fukuda M, Andersson R, Båth P, Dods R, Davidsson J, Matsuoka S, Kawatake S, Murata M, Nureki O, Owada S, Kameshima T, Hatsui T, Joti Y, Schertler G, Yabashi M, Bondar AN, Standfuss J, Neutze R, Iwata S. A three-dimensional movie of structural changes in bacteriorhodopsin. Science 2016; 354:1552-1557. [DOI: 10.1126/science.aah3497] [Citation(s) in RCA: 294] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 11/21/2016] [Indexed: 01/24/2023]
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15
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Suzuki S, Castrillon EE, Arima T, Kitagawa Y, Svensson P. Blood oxygenation of masseter muscle during sustained elevated muscle activity in healthy participants. J Oral Rehabil 2016; 43:900-910. [PMID: 27743403 DOI: 10.1111/joor.12450] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2016] [Indexed: 11/30/2022]
Abstract
Myofascial pain associated with temporomandibular disorders has often been linked to pathological muscle hyperactivity. As a result, localised disturbances of intramuscular blood flow could lead to a lower level of oxygen distribution, hypoxia and microcirculatory changes. To assess haemodynamic changes in the masseter muscle during sustained elevated muscle activity (SEMA). Sixteen healthy participants performed thirty 1-min bouts of SEMA with intervals of 1-min 'rest' periods between the bouts on a bite force transducer device. The participants completed three sessions with different percentage of their maximal voluntary occlusal bite force (MVOBF): 0% (no task), 10% or 40% MVOBF tasks. The order of the sessions was randomised with 1- to 2-week intervals. Haemodynamic characteristics of the masseter muscle were estimated with use of a laser blood oxygenation monitor. Tissue blood oxygen saturation (StO2 ) during SEMA was lower than during rest (P < 0·001). The relative changes in total haemoglobin (Total-Hb) and StO2 were influenced by condition (SEMA and rest) and with interactions between condition and session (0%, 10% and 40% MVOBF tasks). These results suggest that SEMA may lead to hypoxia in the masseter muscle and that the haemodynamic characteristics and muscle symptoms depend on the magnitude of muscle contractions. Overall, the present findings may help to provide better insights into relationships between jaw muscle activity, haemodynamic changes and symptom developments with implications for clinical conditions such as bruxism characterised by different levels of tooth-grinding and tooth-clenching muscle activity.
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Affiliation(s)
- S Suzuki
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Malmö, Stockholm, Sweden.,Division of Oral Diagnosis and Medicine, Department of Oral Pathobiological Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - E E Castrillon
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Malmö, Stockholm, Sweden
| | - T Arima
- Division of International Affairs, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Y Kitagawa
- Division of Oral Diagnosis and Medicine, Department of Oral Pathobiological Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - P Svensson
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Aarhus, Denmark.,Scandinavian Center for Orofacial Neuroscience (SCON), Malmö, Stockholm, Sweden.,Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden
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16
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Murakami Y, Suzuki T, Nii Y, Murai S, Arima T, Kainuma R, Shindo D. Application of strain to orbital-spin-coupled system MnV2O4 at cryogenic temperatures within a transmission electron microscope. Microscopy (Oxf) 2016; 65:223-32. [PMID: 26754562 DOI: 10.1093/jmicro/dfv377] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Accepted: 11/30/2015] [Indexed: 11/14/2022] Open
Abstract
The impact of mechanical stress on the morphology of crystallographic and magnetic domains in shape-controlled specimens of an orbital-spin-coupled system, MnV2O4, was examined by cryogenic Lorentz microscopy. Because of the difference in thermal expansion coefficients of MnV2O4 and the supporting Mo mesh, compression on the order of 0.01% was applied to the thin-foil specimens near the structural/magnetic phase transformation temperatures. The extent of compression was comparable to the lattice striction associated with the cubic-to-tetragonal phase transformation in MnV2O4 The applied strain thus clearly influenced the morphology of crystallographic domains (i.e. twinning configuration in the tetragonal phase) produced during cooling. The magnetic domain structure was entirely dependent on the configuration of twinning in the tetragonal phase. The observations in this study provided useful information for understanding the relationship between the crystallographic domains and the magnetic domains in MnV2O4.
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Affiliation(s)
- Y Murakami
- The Ultramicroscopy Research Center, Kyushu University, Fukuoka 819-0395, Japan Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T Suzuki
- JEOL Ltd., Akishima 196-8558, Japan
| | - Y Nii
- Department of Basic Science, The University of Tokyo, Tokyo 153-8902, Japan
| | - S Murai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Department of Advanced Materials Science, The University of Tokyo, Kashiwa 277-8561, Japan
| | - R Kainuma
- Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
| | - D Shindo
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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17
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Toyoda S, Abe N, Kimura S, Matsuda YH, Nomura T, Ikeda A, Takeyama S, Arima T. One-Way Transparency of Light in Multiferroic CuB(2)O(4). Phys Rev Lett 2015; 115:267207. [PMID: 26765023 DOI: 10.1103/physrevlett.115.267207] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Indexed: 06/05/2023]
Abstract
We experimentally demonstrate one-way transparency of light in multiferroic CuB(2)O(4). The material is rendered transparent for light propagating in one direction, while opaque for light propagating in the opposite direction. The novel transparency results from a destructive interference of the electric dipole and magnetic dipole transitions. The realization of the effect has been accomplished by the application of a high magnetic field and the proper selection of the propagation direction of light in agreement with our quantum mechanical formulation of nonreciprocal directional dichroism.
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Affiliation(s)
- S Toyoda
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - N Abe
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - S Kimura
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Y H Matsuda
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - T Nomura
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - A Ikeda
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - S Takeyama
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - T Arima
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
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18
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Nii Y, Nakajima T, Kikkawa A, Yamasaki Y, Ohishi K, Suzuki J, Taguchi Y, Arima T, Tokura Y, Iwasa Y. Uniaxial stress control of skyrmion phase. Nat Commun 2015; 6:8539. [PMID: 26460119 PMCID: PMC4633814 DOI: 10.1038/ncomms9539] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 05/01/2015] [Accepted: 08/31/2015] [Indexed: 11/09/2022] Open
Abstract
Magnetic skyrmions, swirling nanometric spin textures, have been attracting increasing attention by virtue of their potential applications for future memory technology and their emergent electromagnetism. Despite a variety of theoretical proposals oriented towards skyrmion-based electronics (that is, skyrmionics), few experiments have succeeded in creating, deleting and transferring skyrmions, and the manipulation methodologies have thus far remained limited to electric, magnetic and thermal stimuli. Here, we demonstrate a new approach for skyrmion phase control based on a mechanical stress. By continuously scanning uniaxial stress at low temperatures, we can create and annihilate a skyrmion crystal in a prototypical chiral magnet MnSi. The critical stress is merely several tens of MPa, which is easily accessible using the tip of a conventional cantilever. The present results offer a new guideline even for single skyrmion control that requires neither electric nor magnetic biases and consumes extremely little energy. Chiral magnets can support particle-like magnetization textures called skyrmions which form in lattices and can be manipulated for potential device applications. Here, the authors demonstrate the controlled creation and annihilation of a skyrmion lattice in MnSi single crystals using mechanical stress.
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Affiliation(s)
- Y Nii
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T Nakajima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - A Kikkawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - Y Yamasaki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - K Ohishi
- Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - J Suzuki
- Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
| | - Y Taguchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.,Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - Y Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - Y Iwasa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.,Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
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19
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Fujioka J, Doi A, Okuyama D, Morikawa D, Arima T, Okada KN, Kaneko Y, Fukuda T, Uchiyama H, Ishikawa D, Baron AQR, Kato K, Takata M, Tokura Y. Ferroelectric-like metallic state in electron doped BaTiO3. Sci Rep 2015; 5:13207. [PMID: 26289749 PMCID: PMC4542543 DOI: 10.1038/srep13207] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [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: 04/30/2015] [Accepted: 07/16/2015] [Indexed: 12/05/2022] Open
Abstract
We report that a ferroelectric-like metallic state with reduced anisotropy of polarization is created by the doping of conduction electrons into BaTiO3, on the bases of x-ray/electron diffraction and infrared spectroscopic experiments. The crystal structure is heterogeneous in nanometer-scale, as enabled by the reduced polarization anisotropy. The enhanced infrared intensity of soft phonon along with the resistivity reduction suggests the presence of unusual electron-phonon coupling, which may be responsible for the emergent ferroelectric structure compatible with metallic state.
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Affiliation(s)
- J. Fujioka
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
| | - A. Doi
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
| | - D. Okuyama
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - D. Morikawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T. Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 227-8561 Japan
| | - K. N. Okada
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
| | - Y. Kaneko
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - T. Fukuda
- Syncrotron Radiation Research Unit, JAEA/SPring-8, Sayo, Hyogo 679-5148, Japan
- Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - H. Uchiyama
- Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan
| | - D. Ishikawa
- Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan
| | - A. Q. R. Baron
- Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
- Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan
| | - K. Kato
- Structural Materials Science Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - M. Takata
- Structural Materials Science Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - Y. Tokura
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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20
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Fujita TC, Kozuka Y, Uchida M, Tsukazaki A, Arima T, Kawasaki M. Odd-parity magnetoresistance in pyrochlore iridate thin films with broken time-reversal symmetry. Sci Rep 2015; 5:9711. [PMID: 25959576 PMCID: PMC4426595 DOI: 10.1038/srep09711] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [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: 11/12/2014] [Accepted: 03/17/2015] [Indexed: 11/26/2022] Open
Abstract
A new class of materials termed topological insulators have been intensively investigated due to their unique Dirac surface state carrying dissipationless edge spin currents. Recently, it has been theoretically proposed that the three dimensional analogue of this type of band structure, the Weyl Semimetal phase, is materialized in pyrochlore oxides with strong spin-orbit coupling, accompanied by all-in-all-out spin ordering. Here, we report on the fabrication and magnetotransport of Eu2Ir2O7 single crystalline thin films. We reveal that one of the two degenerate all-in-all-out domain structures, which are connected by time-reversal operation, can be selectively formed by the polarity of the cooling magnetic field. Once formed, the domain is robust against an oppositely polarised magnetic field, as evidenced by an unusual odd field dependent term in the magnetoresistance and an anomalous term in the Hall resistance. Our findings pave the way for exploring the predicted novel quantum transport phenomenon at the surfaces/interfaces or magnetic domain walls of pyrochlore iridates.
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Affiliation(s)
- T C Fujita
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - Y Kozuka
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - M Uchida
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - A Tsukazaki
- 1] Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan [2] Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan [3] PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan
| | - T Arima
- 1] Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan [2] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - M Kawasaki
- 1] Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan [2] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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21
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Tanosoto T, Bendixen KH, Arima T, Hansen J, Terkelsen AJ, Svensson P. Effects of the Paced Auditory Serial Addition Task (PASAT) with different rates on autonomic nervous system responses and self-reported levels of stress. J Oral Rehabil 2014; 42:378-85. [DOI: 10.1111/joor.12257] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2014] [Indexed: 11/28/2022]
Affiliation(s)
- T. Tanosoto
- Department of Crown and Bridge Prosthodontics; Graduate School of Dental Medicine; Hokkaido University; Sapporo Japan
| | - K. H. Bendixen
- Section of Clinical Oral Physiology; Department of Dentistry; Aarhus University; Aarhus Denmark
- Scandinavian Centre for Orofacial Neurosciences (SCON); Aarhus University; Aarhus Denmark
| | - T. Arima
- Department of Crown and Bridge Prosthodontics; Graduate School of Dental Medicine; Hokkaido University; Sapporo Japan
| | - J. Hansen
- Department of Health Science and Technology; Aalborg University; Aalborg Denmark
| | - A. J. Terkelsen
- Danish Pain Research Center and Department of Neurology; Aarhus University; Aarhus Denmark
| | - P. Svensson
- Section of Clinical Oral Physiology; Department of Dentistry; Aarhus University; Aarhus Denmark
- Scandinavian Centre for Orofacial Neurosciences (SCON); Aarhus University; Aarhus Denmark
- Department of Dental Medicine; Karolinska Institute; Huddinge Sweden
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22
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Hiura H, Sugawara A, Ogawa H, John RM, Miyauchi N, Miyanari Y, Horiike T, Li Y, Yaegashi N, Sasaki H, Kono T, Arima T. A tripartite paternally methylated region within the Gpr1-Zdbf2 imprinted domain on mouse chromosome 1 identified by meDIP-on-chip. Nucleic Acids Res 2014; 42:10869. [PMID: 25016528 PMCID: PMC4176375 DOI: 10.1093/nar/gku624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Sato A, Otsu E, Arima T, Utsunomiya T. Relation of sperm methylation abnormality to miscarriage villus methylation abnormality. Fertil Steril 2014. [DOI: 10.1016/j.fertnstert.2014.07.240] [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: 11/24/2022]
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Tokunaga Y, Taguchi Y, Arima T, Tokura Y. Magnetic biasing of a ferroelectric hysteresis loop in a multiferroic orthoferrite. Phys Rev Lett 2014; 112:037203. [PMID: 24484164 DOI: 10.1103/physrevlett.112.037203] [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: 10/06/2013] [Indexed: 06/03/2023]
Abstract
In a multiferroic orthoferrite Dy0.7Tb0.3FeO3, which shows electric-field-(E-)driven magnetization (M) reversal due to a tight clamping between polarization (P) and M, a gigantic effect of magnetic-field (H) biasing on P-E hysteresis loops is observed in the case of rapid E sweeping. The magnitude of the bias E field can be controlled by varying the magnitude of H, and its sign can be reversed by changing the sign of H or the relative clamping direction between P and M. The origin of this unconventional biasing effect is ascribed to the difference in the Zeeman energy between the +P and -P states coupled with the M states with opposite sign.
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Affiliation(s)
- Y Tokunaga
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Y Taguchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - T Arima
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan and Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan and RIKEN SPring-8 Center, Hyogo 679-5148, Japan
| | - Y Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan and Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
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Fujiyama S, Ohsumi H, Ohashi K, Hirai D, Kim BJ, Arima T, Takata M, Takagi H. Spin and orbital contributions to magnetically ordered moments in 5d layered perovskite Sr2IrO4. Phys Rev Lett 2014; 112:016405. [PMID: 24483915 DOI: 10.1103/physrevlett.112.016405] [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: 08/07/2013] [Indexed: 06/03/2023]
Abstract
The ratio of orbital (L) and spin (S) contributions to the magnetically ordered moments of a 5d transition metal oxide, Sr2IrO4 was evaluated by nonresonant magnetic x-ray diffraction. We applied an improved experimental setting that minimized the experimental error, in which we varied only the linear polarization of incident x ray at a fixed scattering angle. Strong polarization dependence of the intensity of magnetic diffraction was observed, from which we conclude that the ordered moments contain substantial contribution from the orbital degree of freedom with the ratio of <L>/<S>∼5.0, evidencing the pronounced effect of spin-orbit coupling. The obtained ratio is close to, but slightly larger than the expected value for the ideal J(eff) = 1/2 moment of a spin-orbital Mott insulator, |<J(1/2)|L(z)|J(1/2)>|/|<J(1/2)|S(z)|J(1/2)>| = 4, which cannot be accounted for by the redistribution of orbital components within the t(2g) bands associated with the elongation of the IrO6 octahedra.
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Affiliation(s)
- S Fujiyama
- RIKEN, Magnetic Materials Laboratory, Wako 351-0198, Japan
| | - H Ohsumi
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - K Ohashi
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - D Hirai
- Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
| | - B J Kim
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T Arima
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan and Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - M Takata
- RIKEN, SPring-8 Center, Sayo, Hyogo 679-5148, Japan
| | - H Takagi
- RIKEN, Magnetic Materials Laboratory, Wako 351-0198, Japan and Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
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Niitaka S, Ohsumi H, Sugimoto K, Lee S, Oshima Y, Kato K, Hashizume D, Arima T, Takata M, Takagi H. A-type antiferro-orbital ordering with I4(1)/a symmetry and geometrical frustration in the spinel vanadate MgV2O4. Phys Rev Lett 2013; 111:267201. [PMID: 24483811 DOI: 10.1103/physrevlett.111.267201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Indexed: 06/03/2023]
Abstract
We conduct a detailed structural analysis of the S=1 pyrochlore antiferromagnet MgV2O4, which exhibits an antiferromagnetic ordering marginally at TN=40 K, triggered by a structural transition from cubic to tetragonal symmetry at TS=62 K, using high resolution synchrotron x-ray diffraction and convergent beam electron diffraction. We reveal that the tetragonal phase below TS has the symmetry of I4(1)/a and that the distortion pattern of VO6 octahedra is consistent with A-type antiferro-orbital ordering with alternating stacking of layers with yz/xy orbital chains and zx/xy orbital chains along the tetragonal c axis. This implies that an anisotropic coupling of V moments produced by the orbital ordering below TS primarily brings about the antiferromagnetic ordering.
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Affiliation(s)
- S Niitaka
- RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Ohsumi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - K Sugimoto
- Japan Synchrotron Radiation Research Institute (JASRI) 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 Japan
| | - S Lee
- Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Y Oshima
- Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Osaka, Ibaraki 567-0047, Japan
| | - K Kato
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - D Hashizume
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Arima
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - M Takata
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - H Takagi
- RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Takeuchi K, Mashimo Y, Shimojo N, Arima T, Inoue Y, Morita Y, Sato K, Suzuki S, Nishimuta T, Watanabe H, Hoshioka A, Tomiita M, Yamaide A, Watanabe M, Okamoto Y, Kohno Y, Hata A, Suzuki Y. Functional variants in the thromboxane A2 receptor gene are associated with lung function in childhood-onset asthma. Clin Exp Allergy 2013; 43:413-24. [PMID: 23517037 DOI: 10.1111/cea.12058] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 09/24/2012] [Accepted: 10/25/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND The thromboxane A2 receptor (TBXA2R) gene is associated with asthma, but no functional genetic variations are known to associate with the disease or its related phenotypes. OBJECTIVE To investigate the association of TBXA2R polymorphisms with asthma susceptibility and related phenotypes and to identify functionally relevant polymorphisms. METHODS We performed comprehensive sequencing of the TBXA2R gene in 48 Japanese control subjects and found a set of variants (SNP1 G>T rs2238634, SNP2 T>G rs2238633, SNP3 C>T rs2238632 and SNP4 G>A rs2238631) in intron 1 in linkage disequilibrium with c.795 T>C rs1131882, which was previously reported to be associated with asthma and related phenotypes. To investigate the effect of four common haplotypes (H1, H2, H3 and H4) on transcriptional activity, we performed a luciferase assay in primary bronchial smooth muscle cells (BSMCs) and human airway epithelial cells (BEAS-2B). We also studied the haplotype association with lung function, TBXA2R mRNA levels, and eosinophil fraction/count in peripheral blood in childhood-onset asthma patients and/or controls. RESULTS H2 and H4, containing minor alleles of SNP2 and SNP3, had significantly higher transcriptional activities than H1 consisting of major alleles (P < 0.001 in BSMCs and BEAS-2B). Homozygotes for redefined haplotype h2 corresponding to minor alleles of SNP2 and SNP3 were associated with lower lung function in childhood-onset asthma patients compared to other zygotes (baseline Forced expiratory volume in one second (FEV1)/ Forced vital capacity (FVC) and Forced expiratory flow between 25% and 75% of the FVC (%FEF(25-75%)): P = 0.00201 and 0.0128, respectively, and post-bronchodilator FEV1/FVC and %FEF(25-75%): P = 0.00224 and 0.0393 respectively). Haplotype h2 was also associated with higher mRNA levels in control peripheral blood cells and higher blood eosinophil fractions and counts in female controls. CONCLUSIONS AND CLINICAL RELEVANCE Genetic variants were identified in the TBXA2R gene that influenced transcriptional activity and were associated with asthma-related phenotypes. Thromboxane pathways may therefore play important roles in airway inflammation and remodelling in asthma patients.
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Affiliation(s)
- K Takeuchi
- Department of Public Health, Graduate School of Medicine, Chiba University, Chiba, Japan
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Utsunomiya T, Arima T. DNA methylation errors at imprinted loci after assisted reproductive technologies (ART) conception originate in the parental sperm. Fertil Steril 2013. [DOI: 10.1016/j.fertnstert.2013.07.394] [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: 11/28/2022]
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29
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Arima T, Takeuchi T, Honda K, Tomonaga A, Tanosoto T, Ohata N, Svensson P. Effects of interocclusal distance on bite force and masseter EMG in healthy participants. J Oral Rehabil 2013; 40:900-8. [PMID: 24033381 DOI: 10.1111/joor.12097] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2013] [Indexed: 11/29/2022]
Abstract
The aim of this study was to investigate effects of interocclusal distance (IOD) on bite force and masseter electromyographic (EMG) activity during different isometric contraction tasks. Thirty-one healthy participants (14 women and 17 men, 21·2 ± 1·8 years) were recruited. Maximal Voluntary Occlusal Bite Force (MVOBF) between the first molars and masseter EMG activity during all the isometric-biting tasks were measured. The participants were asked to bite at submaximal levels of 20%, 40%, 60% and 80% MVOBF with the use of visual feedback. The thickness of the force transducer was set at 8, 12, 16 and 20 mm (= IOD), and sides were tested in random sequence. MVOBF was significantly higher at 8 mm compared with all other IODs (P < 0·001). Only in women, IOD always had significant influence on the corresponding root-mean-square (RMS) value of EMG (P < 0·011). When biting was performed on the ipsilateral side to the dominant hand, the working side consistently showed higher masseter EMG activity compared with the balancing side (P < 0·020). On the contralateral side, there was no difference between the masseter EMG at any IODs. The results replicated the finding that higher occlusal forces can be generated between the first molars at shorter IODs. The new finding in this study was that an effect of hand dominance could be found on masseter muscle activity during isometric biting. This may suggest that there can be a general dominant side effect on human jaw muscles possibly reflecting differences in motor unit recruitment strategies.
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Affiliation(s)
- T Arima
- Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
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30
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Asaka T, Abe N, Kudo T, Fukuda K, Kimoto K, Matsui Y, Ishizawa N, Arima T. Structural phase transition and magnetic-field effect on the modulated structure in GdBaCo2O5+δ (δ < 0.5). Phys Rev Lett 2013; 110:125502. [PMID: 25166819 DOI: 10.1103/physrevlett.110.125502] [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] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/18/2012] [Indexed: 06/03/2023]
Abstract
We investigated the crystal structures of an ordered perovskite-type cobaltate, GdBaCo2O(5+δ) (δ < 0.5), at elevated temperatures by transmission electron microscopy. Above the magnetic ordering temperature, we observed a first-order structural phase transition between the low-temperature tetragonal 3a(p) × 3a(p) and high-temperature orthorhombic 1a(p) × 2a(p) superstructure phases (where a(p) is the perovskite-unit cell). Upon the application of a magnetic field, an incommensurate phase emerges around the structural phase-transition temperature, which indicates a magnetic-field-induced structural phase transition via no magnetic ordering in the ordered perovskite-type cobaltate.
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Affiliation(s)
- T Asaka
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - N Abe
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
| | - T Kudo
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - K Fukuda
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - K Kimoto
- National Institute for Materials Science, Tsukuba 305-0044, Japan
| | - Y Matsui
- National Institute for Materials Science, Tsukuba 305-0044, Japan
| | - N Ishizawa
- Advanced Ceramics Research Center, Nagoya Institute of Technology, Tajimi 507-0071, Japan
| | - T Arima
- Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
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31
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Ishikawa T, Yamada K, Itoh H, Iwai S, Arima T, Yamada S, Sasaki T. Photoinduced Coherent Spin Fluctuation in Primary Dynamics of Insulator to Metal Transition in Perovskite Cobalt Oxide. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134103013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kuroda Y, Idemitsu K, Furuya H, Inagaki Y, Arima T. Diffusion of Technetium in Compacted Bentonites in the Reducing
Condition with Corrosion Products of Iron. ACTA ACUST UNITED AC 2012. [DOI: 10.1557/proc-465-909] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTIn the vicinity of a high-level waste repository, corrosion of carbon steel
overpacks will create a reducing environment. Reducing conditions are
expected to retard the migration of redox-sensitive radionuclides such as
technetium.The apparent diffusion coefficients of technetium were measured in compacted
bentonites (Kunigel VI® and Kunipia F®, JAPAN) in contact with carbon steel
and its corrosion products under reducing conditions or without carbon steel
under oxidizing conditions for comparison. The apparent diffusion
coefficients measured were 10-12 to 10-13
m2/s under oxidizing conditions and 10-12 to
10-13 m2/s under reducing conditions. There were
significant effects of redox condition, dry density (0.2 to 2.3 g /
cm3) and montmorillonite content (50% for Kunigel VI or 100%
for Kunipia F) on the apparent diffusion coefficients. Montmorillonite
density could be a good index to explain density dependence of the diffusion
coefficients under both reducing and oxidizing conditions.
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33
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Utsunomiya T, Arima T. Methylation errors at imprinted loci after assisted reproductive technologies (ART) conception originate in the parental sperm. Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.1043] [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]
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Yamaura J, Ohgushi K, Ohsumi H, Hasegawa T, Yamauchi I, Sugimoto K, Takeshita S, Tokuda A, Takata M, Udagawa M, Takigawa M, Harima H, Arima T, Hiroi Z. Tetrahedral magnetic order and the metal-insulator transition in the pyrochlore lattice of Cd2Os2O7. Phys Rev Lett 2012; 108:247205. [PMID: 23004317 DOI: 10.1103/physrevlett.108.247205] [Citation(s) in RCA: 14] [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: 11/26/2011] [Indexed: 06/01/2023]
Abstract
Cd2Os2O7 shows a peculiar metal-insulator transition at 227 K with magnetic ordering in a frustrated pyrochlore lattice, but its magnetic structure in the ordered state and the transition origin are yet uncovered. We observed a commensurate magnetic peak by resonant x-ray scattering in a high-quality single crystal. X-ray diffraction and Raman scattering experiments confirmed that the transition is not accompanied with any spatial symmetry breaking. We propose a noncollinear all-in-all-out spin arrangement on the tetrahedral network made of Os atoms. Based on this we suggest that the transition is not caused by the Slater mechanism as believed earlier but by an alternative mechanism related to the formation of the specific tetrahedral magnetic order on the pyrochlore lattice in the presence of strong spin-orbit interactions.
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Affiliation(s)
- J Yamaura
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Fujiyama S, Ohsumi H, Komesu T, Matsuno J, Kim BJ, Takata M, Arima T, Takagi H. Two-dimensional Heisenberg behavior of J(eff)=1/2 isospins in the paramagnetic state of the spin-orbital Mott insulator Sr2IrO4. Phys Rev Lett 2012; 108:247212. [PMID: 23004324 DOI: 10.1103/physrevlett.108.247212] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Indexed: 06/01/2023]
Abstract
The dynamical correlations of J(eff)=1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4 were revealed by resonant magnetic x-ray diffuse scattering. We found a two-dimensional antiferromagnetic fluctuation with a large in-plane correlation length exceeding 100 lattice spacings at even 20 K above the magnetic ordering temperature. In marked contrast to the naive expectation of the strong magnetic anisotropy associated with an enhanced spin-orbit coupling, we discovered an isotropic isospin correlation that is well described by the two-dimensional S=1/2 quantum Heisenberg model. The estimated antiferromagnetic coupling constant as large as J∼0.1 eV that is comparable to the small Mott gap (<0.5 eV) points out the weak and marginal Mott character of this spin-orbital entangled system.
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Affiliation(s)
- S Fujiyama
- RIKEN Advanced Science Institute, Wako 351-0198, Japan.
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Yachida W, Castrillon E, Baad-Hansen L, Jensen R, Arima T, Tomonaga A, Ohata N, Svensson P. Craniofacial Pain and Jaw-muscle Activity during Sleep. J Dent Res 2012; 91:562-7. [DOI: 10.1177/0022034512446340] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This study compared the jaw-muscle electromyographic (EMG) activity during sleep in patients with craniofacial pain (n = 63) or no painful conditions (n = 52) and between patients with tension-type headache (TTH: n = 30) and healthy control individuals (n = 30). All participants used a portable single-channel EMG device (Medotech A/S) for four nights. There was no significant difference in EMG activity between craniofacial pain (24.5 ± 17.9 events/hr) and no painful conditions (19.7 ± 14.5), or between TTH (20.8 ± 15.0) and healthy control individuals (15.2 ± 11.6, p >.050). There were positive correlations between EMG activity and number of painful muscles (r = 0.188; p = 0.044), characteristic pain intensity (r = 0.187; p = 0.046), McGill Pain Questionnaire (r = 0.251; p = 0.008), and depression scores (r = 0.291; p = 0.002). Patients with painful conditions had significantly higher night-to-night variability compared with pain-free individuals (p < 0.050). This short-term observational study suggests that there are no major differences between patients with different craniofacial pain conditions and pain-free individuals in terms of jaw-muscle EMG activity recorded with a single-channel EMG device during sleep. However, some associations may exist between the level of EMG activity and various parameters of craniofacial pain. Longitudinal studies are warranted to further explore the relationship between sleep bruxism and craniofacial pain.
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Affiliation(s)
- W. Yachida
- Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - E.E. Castrillon
- Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Aarhus, Denmark
| | - L. Baad-Hansen
- Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Aarhus, Denmark
| | - R. Jensen
- Danish Headache Center, Department of Neurology, Glostrup Hospital, University of Copenhagen, Copenhagen, Denmark
| | - T. Arima
- Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - A. Tomonaga
- Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - N. Ohata
- Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - P. Svensson
- Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Aarhus, Denmark
- Center for Functionally Integrative Neuroscience (CFIN), MindLab, Aarhus University Hospital, Denmark
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Sakai H, Fujioka J, Fukuda T, Okuyama D, Hashizume D, Kagawa F, Nakao H, Murakami Y, Arima T, Baron AQR, Taguchi Y, Tokura Y. Displacement-type ferroelectricity with off-center magnetic ions in perovskite Sr(1-x)Ba(x)MnO3. Phys Rev Lett 2011; 107:137601. [PMID: 22026905 DOI: 10.1103/physrevlett.107.137601] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Indexed: 05/31/2023]
Abstract
We report a ferroelectric transition driven by the off-centering of magnetic Mn(4+) ions in antiferromagnetic Mott insulators Sr(1-x)Ba(x)MnO(3) with a perovskite structure. As x increases, the perovskite lattice shows the typical soft-mode dynamics, as revealed by the momentum-resolved inelastic x-ray scattering and far-infrared spectroscopy, and the ferroelectricity shows up for x ≥ 0.45. The observed polarization is comparable to that for a prototypical ferroelectric BaTiO(3). We further demonstrate that the magnetic order suppresses the ferroelectric lattice dilation by ∼70% and increases the soft-phonon energy by ∼50%, indicating the largest magnetoelectric effects yet attained.
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Affiliation(s)
- H Sakai
- Cross-Correlated Materials Research Group, Advanced Science Institute, RIKEN, Wako, Japan
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Morikawa D, Tsuda K, Yamada S, Arima T. Structure analysis of charge-orbital ordered phases in A-site ordered SmBaMn 2O 6using CBED. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311082353] [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: 11/11/2022] Open
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39
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Kanazawa N, Onose Y, Arima T, Okuyama D, Ohoyama K, Wakimoto S, Kakurai K, Ishiwata S, Tokura Y. Large topological Hall effect in a short-period helimagnet MnGe. Phys Rev Lett 2011; 106:156603. [PMID: 21568591 DOI: 10.1103/physrevlett.106.156603] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Indexed: 05/30/2023]
Abstract
We have observed an unconventional, likely topological, Hall effect over a wide temperature region in the magnetization process of a chiral-lattice helimagnet MnGe. The magnitude of the topological Hall resistivity is nearly temperature-independent below 70 K, which reflects the real-space fictitious magnetic field proportional to a geometric quantity (scalar spin chirality) of the underlying spin texture. From the neutron diffraction study, it is anticipated that a relatively short-period (3-6 nm) noncoplanar spin structure is stabilized from the proper screw state in a magnetic field to produce the largest topological Hall response among the B20-type (FeSi-type) chiral magnets.
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Affiliation(s)
- N Kanazawa
- Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
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Maeda T, Oyama JI, Sasaki M, Arima T, Makino N. The correlation between the clinical laboratory data and the telomere length in peripheral blood leukocytes of Japanese female patients with hypertension. J Nutr Health Aging 2011; 15:240-4. [PMID: 21369674 DOI: 10.1007/s12603-010-0137-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
OBJECTIVE This study investigated the correlation between the chronological age, telomere length in peripheral blood leukocytes and blood laboratory data of female patients with mild hypertension to identify laboratory data that reflect the biological aging of individuals. DESIGN Cross-sectional population-based study. SETTING Outpatient clinic of the Department of Cardiovascular, Respiratory, and Geriatric Medicine Kyushu University Hospital at Beppu in Japan. PARTICIPANTS Outpatients with mild hypertension treated with a low dose of amlodipine. MEASUREMENTS The laboratory data of female patients were collected and the telomere length parameters in their peripheral blood leukocytes were determined by Southern blotting. Any correlations between the laboratory data and the telomere length parameters were assessed. RESULTS The patients showed a positive correlation between the telomere length and the high density lipoprotein, albumin, creatinine, hemoglobin levels, red blood cell counts, and a negative correlation with the globulin level. The extent of subtelomeric methylation of long telomeres tended to correlate negatively with the telomeric attrition. Only the creatinine level correlated with subtelomeric methylation, but not with telomeric length. CONCLUSION HDL and the albumin/globulin ratio were potential indicators for individual somatic genomic aging. Creatinine may therefore be a useful indicator for a predisposition for telomeric attrition.
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Affiliation(s)
- T Maeda
- The Division of Molecular and Clinical Gerontology, Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Oita, 874-0838, Japan.
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Idemitsu K, Tachi Y, Furuya H, Inagaki Y, Arima T. Diffusion of Uranium in Compacted Bentonites in the Reducing Condition with Corrosion Products of Iron. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-412-683] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractIn high-level waste repository, a carbon steel overpack will be corroded after closure. This will create a reducing environment in the vicinity of the repository. Reducing conditions are expected to retard the migration of redox-sensitive radionuclides such as uranium.The apparent diffusion coefficients of uranium were measured in compacted bentonites (Kunigel VI® and Kunipia F®, JAPAN) in contact with carbon steel and its corrosion products under reducing conditions or without carbon steel under oxidizing conditions for comparison. The apparent diffusion coefficients measured were 10-12 to 10-14 m2/s under oxidizing conditions and 10-13 to 10-14 m2/s under reducing conditions. There were significant effects of redox conditions, dry density (0.8 to 2.0 g/cm3) and montmorillonite contents (60% for Kunigel VI or 100% for Kunipia F) on the apparent diffusion coefficients. The sorption of uranium on corrosion products of iron was smaller than that on montmorillonite. Montmorillonite density could be a good index to explain density dependence of the diffusion coefficients under the reducing conditions. Uranium would diffuse in free pore water with diffusion coefficients greater than 10-13 m2/s in low density bentonites under both redox conditions because the diffusion coefficients depended on sorption coefficients. Since diffusion coefficients were independent of sorption coefficients in high density bentonites where free pore water is scarce, surface diffusion might occur with coefficients were of about 10-13 m2/s.
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Makigaki H, Inagaki Y, Idemitsu K, Arima T, Mitsui S, Banba T, Noshita K. Measurement of initial dissolution rate of P0798 simulated HLW glass by using micro-reactor flow-through test method. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-1193-307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractWe applied a new type of flow-through test method using micro-reactor consisting of a simple test apparatus with compact size to measurement of the dissolution rate of a Japanese type of simulated waste glass (P0798 glass). In this test method, a solution flows through a micro-channel (20 mm length, 2 mm width, 0.16 mm depth) in contact with a face of coupon shaped glass specimen, and the output solution is retrieved at certain intervals to be analyzed for determination of the glass dissolution rate. By using this test method the initial dissolution rate of glass matrix or forward dissolution rate was measured as a function of pH (3 to 11) and temperature (25°C to 90°C). The present test results indicated that the initial dissolution rate has ‘V-shaped’ pH dependence, and the effect of pH on the dissolution rate decreases with increase in temperature similar to the results measured by using the Single-pass flow-through (SPFT) method. The present test results also indicated that the dissolution of B is controlled by diffusion process and that of Si is controlled by surface reaction process.
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Idemitsu K, Tachi Y, Furuya H, Inagaki Y, Arima T. Diffusion of Cs and Sr in Compacted Bentonites Under Reducing Conditions and in the Presence of Corrosion Products of Iron. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-506-351] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTIn high-level waste repositories, a carbon steel overpack will be corroded by consuming oxygen trapped in the repository after closure. Iron corrosion products are expected to interfere with migration of radionuclides by filling the pore in bentonite and sorbing radionuclides. In this study the apparent diffusion coefficients of cesium and strontium were measured in compacted Na-bentonites (Kunigel VI® and Kunipia F®, JAPAN) contacted with carbon steel and its corrosion products under reducing conditions or without carbon steel under oxidizing conditions for comparison. The apparent diffusion coefficients of cesium with and without corrosion product were 2.2 to 13 × 10−12 m2/s. The apparent diffusion coefficients of strontium with and without corrosion product were 3.1 to 25 × 10−12 m2/s. There were significant effects of dry density (0.8 to 2.0 g/cm3) and montmorillonite contents (50% for Kunigel V1 or 100% for Kunipia F). The presence of corrosion product decreased the apparent diffusion coefficients of Cs in both bentonites and that of Sr in Kunigel V1, especially at low dry density. This may be due to corrosion product filling the pore in the bentonite, decreasing the free pore size and density for diffusion.
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Inagaki Y, Sakata H, Furuya H, Idemitsu K, Arima T, Banba T, Maeda T, Matsumoto S, Tamura Y, Kikkawa S. Effects of Water Redox Conditions and Presence of Magnetite on Leaching of Pu and Np From HLW Glass. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-506-177] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThe objective of this study is to evaluate the effects of water redox conditions and of the presence of iron corrosion products (magnetite) on the release of actinides from HLW glasses. Static corrosion tests were performed on a simulated HLW glass doped with Pu and Np in deionized water in the presence of magnetite under oxidizing and reducing conditions. The tests under oxidizing conditions were performed in air, while the tests under reducing conditions were performed in mixed gas (Ar+5%H2) atmosphere.The following results were obtained: (1) The presence of magnetite enhances formation of colloids containing Pu and Np in the leachates under both redox conditions. (2) Redox conditions have no remarkable influence on the release of Pu. (3) The reducing conditions combined with the presence of magnetite cause a decrease in the concentrations of Np dissolved species, which is probably the result of the reduction of Np(V) to Np(IV) at the magnetite surface.
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Inoue Y, Shimojo N, Suzuki Y, Nakano T, Morita Y, Arima T, Tomiita M, Kohno Y. Serum Levels of Human Chitinase-like Protein YKL-39 was Lower in Childhood Asthma. J Allergy Clin Immunol 2011. [DOI: 10.1016/j.jaci.2010.12.260] [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: 11/25/2022]
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Tokunaga Y, Kaneko Y, Okuyama D, Ishiwata S, Arima T, Wakimoto S, Kakurai K, Taguchi Y, Tokura Y. Multiferroic M-type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity. Phys Rev Lett 2010; 105:257201. [PMID: 21231619 DOI: 10.1103/physrevlett.105.257201] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Indexed: 05/30/2023]
Abstract
Magnetic and magnetoelectric (ME) properties have been studied for single crystals of Sc-doped M-type barium hexaferrites. Magnetization (M) and neutron diffraction measurements revealed that by tuning Sc concentration a longitudinal conical state is stabilized up to above room temperatures. ME measurements have shown that a transverse magnetic field (H) can induce electric polarization (P) at lower temperatures and that the spin helicity is nonvolatile and endurable up to near the conical magnetic transition temperature. It was also revealed that the response (reversal or retention) of the P vector upon the reversal of M varies with temperature. In turn, this feature allows us to control the relation between the spin helicity and the M vectors with H and temperature.
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Affiliation(s)
- Y Tokunaga
- Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), Wako, Saitama 351-0198, Japan
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Maeda T, Oyama JI, Higuchi Y, Arima T, Mimori K, Makino N. The correlation between the telomeric parameters and the clinical laboratory data in the patients with brain infarct and metabolic disorders. J Nutr Health Aging 2010; 14:793-7. [PMID: 21085912 DOI: 10.1007/s12603-010-0136-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To elucidate the correlation between the telomere length and subtelomeric methylated status in peripheral leukocytes and the laboratory data of inpatients with brain infarction and metabolic disorders. This is the first report describing a link between routine clinical laboratory data and genomic aging. DESIGN Cross-sectional population-based study. SETTING Chronic disease ward of Kyushu University Hospital at Beppu in Japan. PARTICIPANTS Inpatients with brain infarction and metabolic disorders. MEASUREMENTS The laboratory data of male patients were collected and the telomeric parameters in their peripheral leukocytes were determined by a Southern blot analysis with methylation-sensitive and insensitive isoschizomers. Any correlations between the laboratory data and the telomeric parameters were assessed. RESULTS The patients revealed a significant correlation among the fasting blood sugar, HbA1c, serum creatinine and urea nitrogen levels with the mean telomere length, expression of long telomeres ( > 9.4 kb), or the subtelomeric hypermethylation status of long telomeres. CONCLUSION Our results suggested that the hyperglycemia and renal function of patients with metabolic disorders correlated positively with the aging-associated telomeric changes.
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Affiliation(s)
- T Maeda
- Division of Molecular and Clinical Gerontology, Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Oita, Japan.
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Ohtani S, Watanabe Y, Saito M, Abe N, Taniguchi K, Sagayama H, Arima T, Watanabe M, Noda Y. Orbital dilution effect in ferrimagnetic Fe(1-x)Mn(x)Cr(2)O(4): competition between anharmonic lattice potential and spin-orbit coupling. J Phys Condens Matter 2010; 22:176003. [PMID: 21393678 DOI: 10.1088/0953-8984/22/17/176003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetic and structural phase diagram in a spinel-type solid solution system Fe(1-x)Mn(x)Cr(2)O(4) has been investigated. The cubic-to-tetragonal transition temperature T(s 1) is gradually reduced by the substitution of Mn(2+) (3d(5)) for Jahn-Teller-active Fe(2+) (3d(6)) ions, implying the long-range nature of the ferroic interaction between orbitals. In the paramagnetic tetragonal phase for x < 0.5, the c parameter is shorter than a because of the anharmonicity of the elastic energy. The crystal structure further changes to orthorhombic at around the ferrimagnetic transition temperature T(N 1). T(s 1) and T(N 1) meet at x = 0.5, and Mn substitution of more than 0.5 gives rise to another tetragonal phase with a < c. The systematic change in crystal structure is discussed in terms of competition between the anharmonic lattice potential and the intra-atomic spin-orbit interaction at Fe(2+).
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Affiliation(s)
- S Ohtani
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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Arima T, Saito M. Comment on 'Calculated chiral and magneto-electric dichroic signals for copper metaborate (CuB(2)O(4)) in an applied magnetic field'. J Phys Condens Matter 2009; 21:498001. [PMID: 21836208 DOI: 10.1088/0953-8984/21/49/498001] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Contrary to a claim by Lovesey and Staub (2009 J. Phys.: Condens. Matter 21 142201), a careful treatment of symmetry shows that the application of a magnetic field along a twofold axis can induce the crystallographic chirality in a tetragonal system with the point group [Formula: see text] like CuB(2)O(4). The chirality is reversed by a 90° rotation of the magnetic field around the c axis.
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Affiliation(s)
- T Arima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
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Fukunaga M, Sakamoto Y, Kimura H, Noda Y, Abe N, Taniguchi K, Arima T, Wakimoto S, Takeda M, Kakurai K, Kohn K. Magnetic-field-induced polarization flop in multiferroic TmMn2O5. Phys Rev Lett 2009; 103:077204. [PMID: 19792682 DOI: 10.1103/physrevlett.103.077204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2009] [Indexed: 05/28/2023]
Abstract
We discovered a reversible electric polarization flop from the a axis (P(a)) to the b axis (P(b)) in multiferroic TmMn2O5 below 5 K by applying a magnetic field of approximately 0.5 T along the c axis. This phenomenon is the first example of the rare-earth (R) compound RMn2O5. This magnetic-field-induced polarization flop corresponds to a magnetic phase transition from one incommensurate magnetic (ICM) P(a) phase to another ICM P(b) phase, which is equivalent to an ICM P(b) phase above 5 K under no magnetic field. The spin chirality in the bc plane, which was observed in the P(b) phase by polarized neutron diffraction, disappeared in the ICM P(a) phase. This indicates that the polarization in the ICM phases of TmMn2O5 was induced by an S(i) x S(j)-type interaction.
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Affiliation(s)
- M Fukunaga
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
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