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Wang Y, Fu P, Takatsu H, Tassel C, Hayashi N, Cao J, Bataille T, Koo HJ, Ouyang Z, Whangbo MH, Kageyama H, Lu H. Construction of Ideal One-Dimensional Spin Chains by Topochemical Dehydration/Rehydration Route. J Am Chem Soc 2024; 146:8320-8326. [PMID: 38489763 DOI: 10.1021/jacs.3c13902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
One-dimensional (1D) Heisenberg antiferromagnets are of great interest due to their intriguing quantum phenomena. However, the experimental realization of such systems with large spin S remains challenging because even weak interchain interactions induce long-range ordering. In this study, we present an ideal 1D S = 5/2 spin chain antiferromagnet achieved through a multistep topochemical route involving dehydration and rehydration. By desorbing three water molecules from (2,2'-bpy)FeF3(H2O)·2H2O (2,2'-bpy = 2,2'-bipyridyl) at 150 °C and then intercalating two water molecules at room temperature (giving (2,2'-bpy)FeF3·2H2O 1), the initially isolated FeF3ON2 octahedra combine to form corner-sharing FeF4N2 octahedral chains, which are effectively separated by organic and added water molecules. Mössbauer spectroscopy reveals significant dynamical fluctuations down to 2.7 K, despite the presence of strong intrachain interactions. Moreover, results from electron spin resonance (ESR) and heat capacity measurements indicate the absence of long-range order down to 0.5 K. This controlled topochemical dehydration/rehydration approach is further extended to (2,2'-bpy)CrF3·2H2O with S = 3/2 1D chains, thus opening the possibility of obtaining other low-dimensional spin lattices.
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Affiliation(s)
- Yanhong Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Peng Fu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Naoaki Hayashi
- Research Institute for Production Development, Shimogamo, Sakyo, Kyoto 606-0805, Japan
| | - Jiaojiao Cao
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Thierry Bataille
- Institut des Sciences Chimiques de Rennes UMR 6226 CNRS, UBL, Ecole Nationale Supérieure de Chimie de Rennes, 11, allée de Beaulieu, Rennes F-35708, France
| | - Hyun-Joo Koo
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Zhongwen Ouyang
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Myung-Hwan Whangbo
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Hongcheng Lu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Huazhong University of Science and Technology, Wuhan 430074, China
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
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2
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Zhu T, Lu XZ, Aoyama T, Fujita K, Nambu Y, Saito T, Takatsu H, Kawasaki T, Terauchi T, Kurosawa S, Yamaji A, Li HB, Tassel C, Ohgushi K, Rondinelli JM, Kageyama H. Thermal multiferroics in all-inorganic quasi-two-dimensional halide perovskites. Nat Mater 2024; 23:182-188. [PMID: 38182809 DOI: 10.1038/s41563-023-01759-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 11/13/2023] [Indexed: 01/07/2024]
Abstract
Multiferroic materials, particularly those possessing simultaneous electric and magnetic orders, offer a platform for design technologies and to study modern physics. Despite the substantial progress and evolution of multiferroics, one priority in the field remains to be the discovery of unexplored materials, especially those offering different mechanisms for controlling electric and magnetic orders1. Here we demonstrate the simultaneous thermal control of electric and magnetic polarizations in quasi-two-dimensional halides (K,Rb)3Mn2Cl7, arising from a polar-antipolar transition, as evidenced using both X-ray and neutron powder diffraction data. Our density functional theory calculations indicate a possible polarization-switching path including a strong coupling between the electric and magnetic orders in our halide materials, suggesting a magnetoelectric coupling and a situation not realized in oxide analogues. We expect our findings to stimulate the exploration of non-oxide multiferroics and magnetoelectrics to open access to alternative mechanisms, beyond conventional electric and magnetic control, for coupling ferroic orders.
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Affiliation(s)
- Tong Zhu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Xue-Zeng Lu
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Takuya Aoyama
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Koji Fujita
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Yusuke Nambu
- Institute for Materials Research, Tohoku University, Sendai, Japan
- Organization for Advanced Studies, Tohoku University, Sendai, Japan
- FOREST, Japan Science and Technology Agency, Kawaguchi, Japan
| | - Takashi Saito
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Tatsushi Kawasaki
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Takumi Terauchi
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Shunsuke Kurosawa
- Institute for Materials Research, Tohoku University, Sendai, Japan
- New Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Japan
- Institute of Laser Engineering, Osaka University, Suita, Japan
| | - Akihiro Yamaji
- Institute for Materials Research, Tohoku University, Sendai, Japan
- New Industry Creation Hatchery Center (NICHe), Tohoku University, Sendai, Japan
| | - Hao-Bo Li
- SANKEN, Osaka University, Ibaraki, Japan
- Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan
| | - Kenya Ohgushi
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Japan
| | - James M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA.
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Japan.
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3
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Namba M, Takatsu H, Mikita R, Sijia Y, Murayama K, Li HB, Terada R, Tassel C, Ubukata H, Ochi M, Saez-Puche R, Latasa EP, Ishimatsu N, Shiga D, Kumigashira H, Kinjo K, Kitagawa S, Ishida K, Terashima T, Fujita K, Mashiko T, Yanagisawa K, Kimoto K, Kageyama H. Large Perpendicular Magnetic Anisotropy Induced by an Intersite Charge Transfer in Strained EuVO 2H Films. J Am Chem Soc 2023; 145:21807-21816. [PMID: 37770040 DOI: 10.1021/jacs.3c04521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Perovskite oxides ABO3 continue to be a major focus in materials science. Of particular interest is the interplay between A and B cations as exemplified by intersite charge transfer (ICT), which causes novel phenomena including negative thermal expansion and metal-insulator transition. However, the ICT properties were achieved and optimized by cationic substitution or ordering. Here we demonstrate an anionic approach to induce ICT using an oxyhydride perovskite, EuVO2H, which has alternating layers of EuH and VO2. A bulk EuVO2H behaves as a ferromagnetic insulator with a relatively high transition temperature (TC) of 10 K. However, the application of external pressure to the EuIIVIIIO2H bulk or compressive strain from the substrate in the thin films induces ICT from the EuIIH layer to the VIIIO2 layer due to the extended empty V dxy orbital. The ICT phenomenon causes the VO2 layer to become conductive, leading to an increase in TC that is dependent on the number of carriers in the dxy orbitals (up to a factor of 4 for 10 nm thin films). In addition, a large perpendicular magnetic anisotropy appears with the ICT for the films of <100 nm, which is unprecedented in materials with orbital-free Eu2+, opening new perspectives for applications. The present results provide opportunities for the acquisition of novel functions by alternating transition metal/rare earth layers with heteroanions.
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Affiliation(s)
- Morito Namba
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Riho Mikita
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yao Sijia
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Kantaro Murayama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hao-Bo Li
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Ryo Terada
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroki Ubukata
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront Research Center, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Regino Saez-Puche
- Departamento Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040, Madrid, Spain
| | - Elias Palacios Latasa
- INMA, CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain
- Departamento de Ciencia y Tecnología de Materiales y Fluidos, Universidad de Zaragoza, 50018, Zaragoza, Spain
| | - Naoki Ishimatsu
- Department of Physical Science, Graduate School of Science, Hiroshima University, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Daisuke Shiga
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
| | | | - Katsuki Kinjo
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Shunsaku Kitagawa
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Kenji Ishida
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Takahito Terashima
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Koji Fujita
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Takeaki Mashiko
- National Institute for Materials Science, Ibaraki 305-0044, Japan
| | | | - Koji Kimoto
- National Institute for Materials Science, Ibaraki 305-0044, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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4
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Yamada T, Yoshiya M, Kanno M, Takatsu H, Ikeda T, Nagai H, Yamane H, Kageyama H. Correlated Rattling of Sodium-Chains Suppressing Thermal Conduction in Thermoelectric Stannides. Adv Mater 2023; 35:e2207646. [PMID: 36527352 DOI: 10.1002/adma.202207646] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/18/2022] [Indexed: 06/17/2023]
Abstract
Tin-based intermetallics with tunnel frameworks containing zigzag Na chains that excite correlated rattling impinging on the framework phonons are attractive as thermoelectric materials owing to their low lattice thermal conductivity. The correlated rattling of Na atoms in the zigzag chains and the origin of the low thermal conductivity is uncovered via experimental and computational analyses. The Na atoms behave as oscillators along the tunnel, resulting in substantial interactions between Na atoms in the chain and between the chain and framework. In these intermetallic compounds, a shorter inter-rattler distance results in lower thermal conductivity, suggesting that phonon scattering by the correlated rattling Na-chains is enhanced. These results provide new insights into the behavior of thermoelectric materials with low thermal conductivity and suggest strategies for the development of such materials that utilize the correlated rattling.
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Affiliation(s)
- Takahiro Yamada
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, 332-0012, Japan
| | - Masato Yoshiya
- Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masahiro Kanno
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
- Department of Metallurgy, Materials Science and Materials Processing, Graduate School of Engineering, Tohoku University, 6-6-04 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-8579, Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Takuji Ikeda
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST Tohoku), 4-2-1 Nigatake, Miyagino-ku, Sendai, 983-8551, Japan
| | - Hideaki Nagai
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Hisanori Yamane
- Institute of Multidisciplinary Research for Advanced Material, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
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5
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Li HB, Kobayashi S, Zhong C, Namba M, Cao Y, Kato D, Kotani Y, Lin Q, Wu M, Wang WH, Kobayashi M, Fujita K, Tassel C, Terashima T, Kuwabara A, Kobayashi Y, Takatsu H, Kageyama H. Dehydration of Electrochemically Protonated Oxide: SrCoO 2 with Square Spin Tubes. J Am Chem Soc 2021; 143:17517-17525. [PMID: 34647722 DOI: 10.1021/jacs.1c07043] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Controlling oxygen deficiencies is essential for the development of novel chemical and physical properties such as high-Tc superconductivity and low-dimensional magnetic phenomena. Among reduction methods, topochemical reactions using metal hydrides (e.g., CaH2) are known as the most powerful method to obtain highly reduced oxides including Nd0.8Sr0.2NiO2 superconductor, though there are some limitations such as competition with oxyhydrides. Here we demonstrate that electrochemical protonation combined with thermal dehydration can yield highly reduced oxides: SrCoO2.5 thin films are converted to SrCoO2 by dehydration of HSrCoO2.5 at 350 °C. SrCoO2 forms square (or four-legged) spin tubes composed of tetrahedra, in contrast to the conventional infinite-layer structure. Detailed analyses suggest the importance of the destabilization of the SrCoO2.5 precursor by electrochemical protonation that can greatly alter reaction energy landscape and its gradual dehydration (H1-xSrCoO2.5-x/2) for the SrCoO2 formation. Given the applicability of electrochemical protonation to a variety of transition metal oxides, this simple process widens possibilities to explore novel functional oxides.
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Affiliation(s)
- Hao-Bo Li
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Shunsuke Kobayashi
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
| | - Chengchao Zhong
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Morito Namba
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yu Cao
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Daichi Kato
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yoshinori Kotani
- Japan Synchrotron Radiation Research Institute, Sayo-cho, Hyogo 679-5198, Japan
| | - Qianmei Lin
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Maokun Wu
- Department of Electronic Science and Engineering and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071, China
| | - Wei-Hua Wang
- Department of Electronic Science and Engineering and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, Nankai University, Tianjin 300071, China
| | - Masaki Kobayashi
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Koji Fujita
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Takahito Terashima
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Akihide Kuwabara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
| | - Yoji Kobayashi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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Chiba Y, Shibata K, Takatsu H, Fujii K, Saito M, Kageyama H, Maeda K, Yashima M, Motohashi T. Electrochemical Crystal Growth of Titanium Oxyfluorides-A Strategy for Development of Electron-Doped Materials. Inorg Chem 2021; 60:14613-14621. [PMID: 34463090 DOI: 10.1021/acs.inorgchem.1c01640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report on the growth of single crystals of an electron-doped titanium oxyfluoride, Li2Ti(O,F)3, employing high-temperature electrolysis of TiO2 with a eutectic Li2MoO4-LiF melt. Greenish octahedral-shaped crystals (∼30 μm in size) with a cubic rocksalt-type structure were successfully obtained by precisely tuning the applied voltage. The temperature-dependent magnetic susceptibility data revealed a paramagnetic behavior at low temperatures, ensuring the presence of Ti3+ ions (mean valence number of +3.78; F/Ti ∼ 0.15). The crystals exhibited clear visible-light absorption and produced H2 from water in the presence of a sacrificial reagent under UV-light irradiation. Li2Ti(O,F)3 more efficiently produced H2 compared with a nondoped oxyfluoride Li5Ti2O6F, likely due to the doped electrons for the former. This work highlights a promising electrochemical approach toward growing electron-doped oxyfluoride crystals.
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Affiliation(s)
- Yusuke Chiba
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan.,Japan Society for the Promotion of Science (JSPS), Kojimachi Business Center Building, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Kengo Shibata
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Miwa Saito
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kazuhiko Maeda
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-NE-2 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Teruki Motohashi
- Department of Materials and Life Chemistry, Faculty of Engineering, Kanagawa University, Yokohama, Kanagawa 221-8686, Japan
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7
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Takatsu H, Onoda S, Kittaka S, Kasahara A, Kono Y, Sakakibara T, Kato Y, Fåk B, Ollivier J, Lynn JW, Taniguchi T, Wakita M, Kadowaki H. Erratum: Quadrupole Order in the Frustrated Pyrochlore Tb_{2+x}Ti_{2-x}O_{7+y} [Phys. Rev. Lett. 116, 217201 (2016)]. Phys Rev Lett 2021; 127:069902. [PMID: 34420355 DOI: 10.1103/physrevlett.127.069902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Indexed: 06/13/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.116.217201.
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8
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Higashi K, Ochi M, Nambu Y, Yamamoto T, Murakami T, Yamashina N, Tassel C, Matsumoto Y, Takatsu H, Brown CM, Kageyama H. Enhanced Magnetic Interaction by Face-Shared Hydride Anions in 6H-BaCrO 2H. Inorg Chem 2021; 60:11957-11963. [PMID: 34309363 DOI: 10.1021/acs.inorgchem.1c00992] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Studies on magnetic oxyhydrides have been almost limited to perovskite-based lattices with corner-sharing octahedra with a M-H-M (M: transition metal) angle of θ ∼ 180°. Using a high-pressure method, we prepared BaCrO2H with a 6H-type hexagonal perovskite structure with corner- and face-sharing octahedra, offering a unique opportunity to investigate magnetic interactions based on a θ ∼ 90° case. Neutron diffraction for BaCrO2H revealed an antiferromagnetic (AFM) order at TN ∼ 375 K, which is higher than ∼240 K in BaCrO3-xFx. The relatively high TN of BaCrO2H can be explained by the preferred occupancy of H- at the face-sharing site that provides AFM superexchange in addition to AFM direct exchange interactions. First-principles calculations on BaCrO2H in comparison with BaCrO2F and BaMnO3 further reveal that the direct Cr-Cr interaction is significantly enhanced by shortening the Cr-Cr distance due to the covalent nature of H-. This study provides a useful strategy for the extensive control of magnetic interactions by exploiting the difference in the covalency of multiple anions.
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Affiliation(s)
- Kentaro Higashi
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Yusuke Nambu
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.,FOREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.,Japan Organization for Advanced Studies, Tohoku University, Sendai 980-8577, Japan
| | - Takafumi Yamamoto
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Taito Murakami
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Naoya Yamashina
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yuki Matsumoto
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Craig M Brown
- Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, United States
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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9
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Ishida K, Tassel C, Watabe D, Takatsu H, Brown CM, Nilsen GJ, Kageyama H. Spin Frustration in Double Perovskite Oxides and Oxynitrides: Enhanced Frustration in La 2MnTaO 5N with a Large Octahedral Rotation. Inorg Chem 2021; 60:8252-8258. [PMID: 34029076 PMCID: PMC10494547 DOI: 10.1021/acs.inorgchem.1c00927] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The B-site sublattice in the double perovskite oxides A2BB'O6 (B: magnetic cation; B': nonmagnetic cation) causes spin frustration, but the relationship between the structure and spin frustration remains unclear although a number of compounds have been studied. The present study systematically investigated A2MnIIB'O6 (S = 5/2) and found that the frustration factor, defined by f = |θW|/TN (θW: Weiss temperature; TN: Néel temperature), scales linearly with the tolerance factor t, i.e., octahedral rotation. Unexpectedly, La2MnTaO5N (space group: P21/n) synthesized under high pressure is more frustrated (f = 6) than oxides with similar t values, despite the large octahedral rotation due to the small t value of 0.914. Structural analysis suggests that the enhanced frustration can be attributed to the site preference of nitride anions at the equatorial positions, which reduces the variance of neighboring Mn-Mn distances. Our findings provide a new guide to control and improve spin frustration in double perovskites with multiple anions.
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Affiliation(s)
- Kohdai Ishida
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Daichi Watabe
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Craig M. Brown
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Gøran Jan Nilsen
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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10
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Ogiwara N, Tomoda M, Miyazaki S, Weng Z, Takatsu H, Kageyama H, Misawa T, Ito T, Uchida S. Integrating molecular design and crystal engineering approaches in non-humidified intermediate-temperature proton conductors based on a Dawson-type polyoxometalate and poly(ethylene glycol) derivatives. Nanoscale 2021; 13:8049-8057. [PMID: 33956921 DOI: 10.1039/d1nr01220g] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Anionic metal-oxygen clusters known as polyoxometalates (POMs) have been widely researched as components of proton conductors. While proton conduction under non-humidified intermediate-temperature (100-250 °C) conditions is advantageous from the viewpoint of kinetics, few solid-state materials, not to mention POM-based crystals, show truly effective proton conduction without the aid of water vapor. In this context, non-volatile proton-conductive polymers have been confined into POM-based frameworks, while fast proton conduction was infeasible. Herein, we demonstrate a new strategy to synthesize POM-polymer composites exhibiting fast proton conduction under non-humidified intermediate-temperature conditions. Specifically, a molecular design approach utilizing poly(ethylene glycol)s (PEGs) of different terminal groups or chain lengths controls the proton carrier density, and a crystal engineering approach using a large Dawson-type POM ([α-P2W18O62]6-) with an anisotropic molecular shape and alkali metal ions as counter cations fine-tunes the mobility of the confined PEGs as proton carriers. By integrating these approaches, proton conductivity over 10-4 S cm-1 at 150 °C, comparable to the well-known highly proton-conductive solid-state materials, is achieved. The proton conduction mechanism is discussed with alternative current impedance spectroscopy jointly with specific heat capacity measurements and solid-state NMR spectroscopy.
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Affiliation(s)
- Naoki Ogiwara
- Department of Basic Science, School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan.
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11
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Yamamoto T, Chikamatsu A, Kitagawa S, Izumo N, Yamashita S, Takatsu H, Ochi M, Maruyama T, Namba M, Sun W, Nakashima T, Takeiri F, Fujii K, Yashima M, Sugisawa Y, Sano M, Hirose Y, Sekiba D, Brown CM, Honda T, Ikeda K, Otomo T, Kuroki K, Ishida K, Mori T, Kimoto K, Hasegawa T, Kageyama H. Strain-induced creation and switching of anion vacancy layers in perovskite oxynitrides. Nat Commun 2020; 11:5923. [PMID: 33230157 PMCID: PMC7683707 DOI: 10.1038/s41467-020-19217-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 05/05/2020] [Accepted: 09/28/2020] [Indexed: 11/09/2022] Open
Abstract
Perovskite oxides can host various anion-vacancy orders, which greatly change their properties, but the order pattern is still difficult to manipulate. Separately, lattice strain between thin film oxides and a substrate induces improved functions and novel states of matter, while little attention has been paid to changes in chemical composition. Here we combine these two aspects to achieve strain-induced creation and switching of anion-vacancy patterns in perovskite films. Epitaxial SrVO3 films are topochemically converted to anion-deficient oxynitrides by ammonia treatment, where the direction or periodicity of defect planes is altered depending on the substrate employed, unlike the known change in crystal orientation. First-principles calculations verified its biaxial strain effect. Like oxide heterostructures, the oxynitride has a superlattice of insulating and metallic blocks. Given the abundance of perovskite families, this study provides new opportunities to design superlattices by chemically modifying simple perovskite oxides with tunable anion-vacancy patterns through epitaxial lattice strain.
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Affiliation(s)
- Takafumi Yamamoto
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan.,Laboratory for Materials and Structures, Tokyo Institute of Technology, Yokohama, 226-8503, Japan
| | - Akira Chikamatsu
- Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Shunsaku Kitagawa
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Nana Izumo
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan
| | | | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Takahiro Maruyama
- Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Morito Namba
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Wenhao Sun
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Takahide Nakashima
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Fumitaka Takeiri
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Kotaro Fujii
- Department of Chemistry, School of Science, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
| | - Masatomo Yashima
- Department of Chemistry, School of Science, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
| | - Yuki Sugisawa
- Tandem Accelerator Complex, University of Tsukuba, Ibaraki, 305-8577, Japan
| | - Masahito Sano
- Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Yasushi Hirose
- Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Daiichiro Sekiba
- Tandem Accelerator Complex, University of Tsukuba, Ibaraki, 305-8577, Japan
| | - Craig M Brown
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Takashi Honda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan
| | - Kazutaka Ikeda
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan
| | - Toshiya Otomo
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan
| | - Kazuhiko Kuroki
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan
| | - Kenji Ishida
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Takao Mori
- National Institute for Materials Science, Ibaraki, 305-0044, Japan
| | - Koji Kimoto
- National Institute for Materials Science, Ibaraki, 305-0044, Japan
| | - Tetsuya Hasegawa
- Department of Chemistry, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate school of Engineering, Graduate School of Engineering, Nishikyo-ku, Kyoto, 615-8510, Japan. .,CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan. .,Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan.
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12
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Muramatsu T, Ishikawa M, Nanasato M, Nagasaka R, Takatsu H, Yoshiki Y, Hashimoto Y, Ohota M, Kamiya H, Yoshida Y, Murohara T, Ozaki Y, Izawa H. Comparison between optical frequency domain imaging and intravascular ultrasound in PCI guidance for Biolimus A9 eluting stent implantation. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.2466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
It has been reported that intravascular ultrasound (IVUS) guided PCI reduced a risk of major adverse cardiac event compared to conventional angiography guided PCI, while comparison between IVUS-guided and optical frequency domain imaging (OFDI)-guided PCI specifically in long-term clinical outcomes (>1 year) has been unexplored.
Purpose
We sought to compare imaging surrogates at 8 months and clinical outcomes beyond 1 year after drug-eluting stent implantation between IVUS and OFDI guidance.
Methods
The MISTIC-1 is a prospective, multi-centre, single-blinded, randomised-controlled, non-inferiority trial comparing OFDI-guided and IVUS-guided PCI using Biolimus A9 eluting Nobori stent. We enrolled patients with stable coronary artery disease who have symptoms or clinically relevant myocardial ischemia. Stent landing zones were selected in the most normal looking sites with largest lumen and without percentage plaque area >50% in IVUS group while without lipidic plaque of >2 quadrants or suggestive thin-cap fibroatheroma in OFDI group. Stent sizing was based on external elastic lamina (EEL) in IVUS group, while by taking 10% or 0.25mm larger than mean lumen diameter at reference sites in OFDI group. Stent optimisation with in-stent minimum lumen area ≥80% of the average lumen area at proximal and distal reference sites was encouraged in both groups. Primary efficacy endpoint is in-segment minimum lumen area (MLA) assessed by OFDI at 8 months. Secondary safety endpoint is a composite of cardiovascular death, target vessel myocardial infarction, or target lesion revascularisation. Based on the assumption that mean in-segment MLA at follow-up was 4.5mm2 with a standard deviation of 2.0mm2 in the control (IVUS) group and a non-inferiority limit of 1.2mm2 for OFDI group, sample size was estimated as 48 cases in each group with 5% type I error and 90% statistical power.
Results
Since June-2014 and August-2016, we prospectively enrolled 109 patients (mean age 70 years, male 78%) with 126 lesions. Baseline patient and lesion characteristics were well balanced and average nominal size and length of stent used did not differ between OFDI-guided and IVUS-guided PCI (3.0 and 19.1mm vs. 3.1 and 19.3mm, respectively). Post-procedural minimum stent area was 6.24mm2 in OFDI group and 6.72mm2 in IVUS group (p=0.20). At 8-month follow-up, in-segment MLA was 4.56mm2 in OFDI group and 4.13mm2 in IVUS group (P for non-inferiority <0.001). During the follow-up (median 4.5 years [1654 days]), incidence rates of major adverse cardiac event were comparable between the two groups (7.4% in OFDI group and 7.3% in IVUS group, hazard ratio 0.96, 95% CI 0.24–3.83, p=0.95). No definite or probable stent thrombosis were documented in both groups.
Conclusion
OFDI-guided PCI demonstrated comparable results in achieving satisfactory imaging surrogates as well as long-term clinical outcomes after newer generation DES implantation as compared to IVUS-guided PCI.
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): Suzuken Memorial Foundation
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Affiliation(s)
- T Muramatsu
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
| | - M Ishikawa
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
| | - M Nanasato
- Sakakibara Heart Institute, Department of Cardiology, Fucyu Tokyo, Japan
| | - R Nagasaka
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
| | - H Takatsu
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
| | - Y Yoshiki
- Fujita Health University Okazaki Medical Center, Department of Cardiology, Okazaki, Japan
| | - Y Hashimoto
- Fujita Health University Okazaki Medical Center, Department of Cardiology, Okazaki, Japan
| | - M Ohota
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
| | - H Kamiya
- Gifu Heart Center, Department of Cardiovascular Medicine, Gifu, Japan
| | - Y Yoshida
- Nagoya Daini Red Cross Hospital, Cardiovascular Center, Nagoya, Japan
| | - T Murohara
- Nagoya University Graduate School of Medicine, Department of Cardiology, Nagoya, Japan
| | - Y Ozaki
- Fujita Health University Okazaki Medical Center, Department of Cardiology, Okazaki, Japan
| | - H Izawa
- Fujita Health University Hospital, Cardiovascular Center, Department of Cardiology, Toyoake, Japan
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13
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Ohta M, Ozaki Y, Toriya T, Nagasaya R, Takatsu H, Yoshiki Y, Hashimoto Y, Ishikawa M, Kawai H, Muramatsu T, Naruse H, Takahashi H, Ishii J, Izawa H. Five-year major adverse cardiac and cerebrovascular events of patients with lipid core abutting lumen (LCAL) on integrated-backscatter intravascular ultrasound undergoing PCI with current DES. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.0322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Percutaneous Coronary Intervention (PCI) using the new generation drug-eluting stent (DES) has been extremely reduced target lesion revascularization (TLR) in recent years. However, a high incidence of non-target lesion-related cardiovascular events in patients undergoing PCI is an important problem to be solved. According to the previous findings, patients with vulnerable plaques particularly have a high recurrence of cardiovascular events. Little studies, however, has been done to examine the relationship between plaque characteristics on intravascular imaging in a target lesion and non-target lesion-related cardiovascular events.
Purpose
The main objective of this study is to investigate the five-year major adverse cardiac and cerebrovascular events (MACCE) of patients with lipid core abutting lumen (LCAL) on integrated backscatter intravascular ultrasound (IB-IVUS) in a target lesion undergoing PCI with current DES.
Methods and results
Between February 2010 and September 2013, in total 780 patients with ischemic heart disease undergoing PCI, 166 target lesions in 166 consecutive patients with non-ST segment elevation acute coronary syndrome (NSTE-ACS) and stable angina pectoris (SAP) undergoing IVUS-guided PCI were studied.
Plaque characteristics in all target lesions were analyzed by three-dimensional IB-IVUS system using the mechanical IVUS catheter. Our previous study has found that LCAL which is defined as a lipid pool directly in contact with the lumen visualizes the thin fibrous cap of less than 75μm on optical coherence tomography (OCT). On the basis of this data, LCAL at minimal lumen area (MLA) site was identified.
In total, 39 patients had lesions with LCAL at MLA site (LCAL(+)), and 127 patients had those without LCAL (LCAL(−)).
The primary endpoint was defined as MACCE, including cardiovascular death, non-fatal myocardial infarction, non-fatal stroke and non-TLR for the new lesion during a median follow up of five years. The MACCE occurred significantly higher in the LCAL(+) than in the LCAL(−) (38.5% vs. 17.3%; p<0.005). And the Kaplan-Meier estimates have shown that the cumulative incidence of MACCE was significantly higher in the LCAL(+) than in the LCAL(−) (log rank test, p=0.041). Additionally, after adjustment for confounders, gender, prior PCI and LCAL was the independent predictors for the MACCE of patients undergoing PCI with current DES.
Furthermore, after adding LCAL to a baseline model with established factors consisting of age, gender, diabetes mellitus, prior PCI and percentage lipid volume on IB-IVUS, the net reclassification (p<0.002) and integrated discrimination improvement (p<0.004) significantly improved compared to baseline model alone.
Conclusions
In this study, it has become clear that LCAL on IB-IVUS is likely to be a surrogate marker of MACCE in patients undergoing PCI with current DES.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Ohta
- Fujita Health University, Toyoake, Japan
| | - Y Ozaki
- Fujita Health University, Toyoake, Japan
| | - T Toriya
- Fujita Health University, Toyoake, Japan
| | - R Nagasaya
- Fujita Health University, Toyoake, Japan
| | - H Takatsu
- Fujita Health University, Toyoake, Japan
| | - Y Yoshiki
- Fujita Health University, Toyoake, Japan
| | | | - M Ishikawa
- Sakurabashi-Watanabe Hospital, Cardiology, Osaka, Japan
| | - H Kawai
- Fujita Health University, Toyoake, Japan
| | | | - H Naruse
- Fujita Health University, Toyoake, Japan
| | | | - J Ishii
- Fujita Health University, Toyoake, Japan
| | - H Izawa
- Fujita Health University Second Hospital, Cardiology, Nagoya, Japan
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14
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Takatsu H, Ochi M, Yamashina N, Namba M, Kuroki K, Terashima T, Kageyama H. Epitaxial Stabilization of SrCu 3O 4 with Infinite Cu 3/2O 2 Layers. Inorg Chem 2020; 59:10042-10047. [PMID: 32639728 DOI: 10.1021/acs.inorgchem.0c01213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
We report the epitaxial thin-film synthesis of SrCu3O4 with infinitely stacked Cu3O4 layers composed of edge-sharing CuO4 square planes, using molecular-beam epitaxy. Experimental and theoretical characterizations showed that this material is a metastable phase that can exist by applying tensile biaxial strain from the (001)-SrTiO3 substrate. SrCu3O4 shows an insulating electrical resistivity in accordance with the Cu2+ valence state revealed by X-ray photoelectron spectroscopy. First-principles calculations also indicated that the unoccupied d3z2-r2 band becomes substantially stabilized owing to the absence of apical anions, in contrast to A2Cu3O4Cl2 (A = Sr, Ba) with an A2Cl2 block layer and therefore a trans-CuO4Cl2 octahedron. These results suggest that SrCu3O4 is a suitable parent material for electron-doped superconductivity based on the Cu3O4 plane.
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Affiliation(s)
- Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Masayuki Ochi
- Department of Physics, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Naoya Yamashina
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Morito Namba
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Kazuhiko Kuroki
- Department of Physics, Osaka University, Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Takahito Terashima
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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15
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Abstract
Rattling phenomena have been observed in materials characterized by a large cage structure but not in a simple ABO3-type perovskite because the size mismatch, if it exists, can be relieved by octahedral rotations. Here, we demonstrate that a stoichiometric perovskite oxide NaWO3, prepared under high pressure, exhibits anharmonic phonon modes associated with low-energy rattling vibrations, leading to suppressed thermal conductivity. The structural analysis and the comparison with the ideal perovskite KWO3 without rattling behavior reveal that the presence of two crystallographic Na1 (2 a) and Na2 (6 b) sites in NaWO3 (space group Im3̅) accompanied by three in-phase WO6 octahedral (a+a+a+) rotations generates an open space Δ ∼ 0.5 Å for the latter site, which is comparable with those of well-known cage compounds of clathrates and filled skutterudites. The observed rattling in NaWO3 is distinct from a quadruple perovskite AA'3B4O12 (A, A': transition metals) where the A (2 a) site with lower multiplicity is the rattler. The present finding offers a general guide to induce rattling of atoms in pristine ABO3 perovskites.
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Affiliation(s)
- Yuya Ikeuchi
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Craig M. Brown
- Center for Neutron Research National Institute of Standards and Technology Gaithersburg, Maryland 20899, United States
| | - Taito Murakami
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yuki Matsumoto
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yoshihiko Okamoto
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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16
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Matsumoto Y, Yamamoto T, Nakano K, Takatsu H, Murakami T, Hongo K, Maezono R, Ogino H, Song D, Brown CM, Tassel C, Kageyama H. High-Pressure Synthesis of A 2 NiO 2 Ag 2 Se 2 (A=Sr, Ba) with a High-Spin Ni 2+ in Square-Planar Coordination. Angew Chem Int Ed Engl 2019; 58:756-759. [PMID: 30430710 PMCID: PMC6993455 DOI: 10.1002/anie.201810161] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/22/2018] [Indexed: 11/07/2022]
Abstract
Square-planar coordinate Ni2+ ions in oxides are exclusively limited to a low-spin state (S=0) owing to extensive crystal field splitting. Layered oxychalcogenides A2 NiII O2 Ag2 Se2 (A=Sr, Ba) with the S=1 NiO2 square lattice are now reported. The structural analysis revealed that the Ni2+ ion is under-bonded by a significant tensile strain from neighboring Ag2 Se2 layers, leading to the reduction in crystal field splitting. Ba2 NiO2 Ag2 Se2 exhibits a G-type spin order at 130 K, indicating fairly strong in-plane interactions. The high-pressure synthesis employed here possibly assists the expansion of NiO2 square lattice by taking the advantage of the difference in compressibility in oxide and selenide layers.
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Affiliation(s)
- Yuki Matsumoto
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
| | - Takafumi Yamamoto
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
| | - Kousuke Nakano
- School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292 (Japan)
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
| | - Taito Murakami
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
| | - Kenta Hongo
- School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292 (Japan)
- Research Center for Advanced Computing Infrastructure, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292 (Japan)
- National Institute for Materials Science, Tsukuba 305-0047 (Japan)
- PRESTO (Japan)
- Computational Engineering Applications Unit. RIKEN, 2-1 Hirosawa, Wako. Saitama 351-0198 (Japan)
| | - Ryo Maezono
- School of Information Science, JAIST, Asahidai 1-1, Nomi, Ishikawa 923-1292 (Japan)
- Computational Engineering Applications Unit. RIKEN, 2-1 Hirosawa, Wako. Saitama 351-0198 (Japan)
| | - Hiraku Ogino
- Electronics and Photonics Research Institute, AIST, Ibaraki 305-8568 (Japan)
| | - Dongjoon Song
- Electronics and Photonics Research Institute, AIST, Ibaraki 305-8568 (Japan)
| | - Craig M. Brown
- Center for Neutron Research, NIST, Gaithersburg, MD 20899-6102 (USA)
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan)
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17
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Yoshizane T, Tanaka R, Kato M, Hayano Y, Takai A, Ueno C, Kishi R, Iwata T, Otsuka M, Nagaya M, Sato H, Noda T, Takatsu H, Minatoguchi S, Kawasaki M. P1769Impact of left ventricular size and deformational parameters on ejection fraction in patients with hemodialysis: a study using 3-dimensional speckle tracking echocardiography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- T Yoshizane
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - R Tanaka
- Murakami memorial Hospital, Gifu, Japan
| | - M Kato
- Chuno Kosei Hospital, Seki, Japan
| | - Y Hayano
- Chuno Kosei Hospital, Seki, Japan
| | - A Takai
- Chuno Kosei Hospital, Seki, Japan
| | - C Ueno
- Chuno Kosei Hospital, Seki, Japan
| | - R Kishi
- Chuno Kosei Hospital, Seki, Japan
| | - T Iwata
- Chuno Kosei Hospital, Seki, Japan
| | - M Otsuka
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - M Nagaya
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - H Sato
- Sawada Hospital, Gifu, Japan
| | - T Noda
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | | | - S Minatoguchi
- Gifu University Graduate School of Medicine, Cardiology, Gifu, Japan
| | - M Kawasaki
- Gifu University Graduate School of Medicine, Cardiology, Gifu, Japan
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18
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Yoshizane T, Tanaka R, Minatoguchi S, Kawamura I, Sato H, Otsuka M, Nagaya M, Ueno T, Watanabe R, Warita S, Noda T, Nagata K, Takatsu H, Minatoguchi S, Kawasaki M. P866Noninvasive and comprehensive evaluation of the impact of left ventricular pressure overload on both systolic and diastolic function using speckle tracking echocardiography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- T Yoshizane
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - R Tanaka
- Murakami Memorial Hospital, Cardiology, GIfu, Japan
| | - S Minatoguchi
- Gifu University Graduate School of Medicine, Cardiology, Gifu, Japan
| | | | - H Sato
- Sawada Hospital, Gifu, Japan
| | - M Otsuka
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - M Nagaya
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - T Ueno
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - R Watanabe
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - S Warita
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | - T Noda
- Gifu Prefectural General Medical Center, Cardiology, Gifu, Japan
| | | | | | - S Minatoguchi
- Gifu University Graduate School of Medicine, Cardiology, Gifu, Japan
| | - M Kawasaki
- Gifu University Graduate School of Medicine, Cardiology, Gifu, Japan
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19
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Minatoguchi S, Yoshizane T, Kawamura I, Tanaka R, Kishi R, Nagaya M, Sato H, Iwata T, Ono K, Matsuo H, Noda T, Nagata K, Takatsu H, Minatoguchi S, Kawasaki M. P5649Impact of left ventricular pressure overload on relaxation and stiffness in patients with preserved ejection fraction: noninvasive study using speckle tracking echocardiography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Minatoguchi
- Gifu University Graduate School of Medicine, Department of Cardiology, Gifu, Japan
| | - T Yoshizane
- Gifu Prefectural General Medical Center, Department of Cardiology, Gifu, Japan
| | | | - R Tanaka
- Murakami Memorial Hospital, Department of Cardiology, Gifu, Japan
| | - R Kishi
- Chuno Kosei Hospital, Seki, Japan
| | - M Nagaya
- Gifu Prefectural General Medical Center, Department of Cardiology, Gifu, Japan
| | - H Sato
- Sawada Hospital, Gifu, Japan
| | - T Iwata
- Chuno Kosei Hospital, Seki, Japan
| | - K Ono
- Gifu Prefectural General Medical Center, Department of Cardiology, Gifu, Japan
| | | | - T Noda
- Gifu Prefectural General Medical Center, Department of Cardiology, Gifu, Japan
| | | | | | - S Minatoguchi
- Gifu University Graduate School of Medicine, Department of Cardiology, Gifu, Japan
| | - M Kawasaki
- Gifu University Graduate School of Medicine, Department of Cardiology, Gifu, Japan
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20
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Minatoguchi S, Yoshizane T, Kawamura I, Kawasaki M, Tanaka R, Sato H, Ono K, Noda T, Takatsu H, Minatoguchi S. P5238Noninvasive assessment of impact of left ventricular pressure overload on relaxation using speckle tracking echocardiography: Multicenter Study. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx493.p5238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Lu H, Hayashi N, Matsumoto Y, Takatsu H, Kageyama H. Mixed-Spin Diamond Chain Cu2FePO4F4(H2O)4 with a Noncollinear Spin Order and Possible Successive Phase Transitions. Inorg Chem 2017; 56:9353-9360. [DOI: 10.1021/acs.inorgchem.7b01533] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hongcheng Lu
- Graduate School
of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Naoaki Hayashi
- Research Institute for Production Development, 15 Morimoto, Shimogamo, Sakyo, Kyoto 606-0805, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida-ushinomiya, Sakyo, Kyoto 606-8501, Japan
| | - Yuki Matsumoto
- Graduate School
of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Takatsu
- Graduate School
of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hiroshi Kageyama
- Graduate School
of Engineering, Kyoto University, Kyoto 615-8510, Japan
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22
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Fukui K, Nakamura S, Nakanishi A, Okihiro S, Takatsu H. CALCIUM INFLUX ACCELERATES NEURITE DEGENERATION VIA MITOCHONDRIAL-DEPENDENT OXIDATION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- K. Fukui
- Shibaura Institute of Technology, Saitama, Japan,
| | - S. Nakamura
- Shibaura Institute of Technology, Saitama, Japan,
| | - A. Nakanishi
- Shibaura Institute of Technology, Saitama, Japan,
| | - S. Okihiro
- Shibaura Institute of Technology, Saitama, Japan,
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23
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Ikeuchi Y, Takatsu H, Tassel C, Goto Y, Murakami T, Kageyama H. High‐Pressure Synthesis of Fully Occupied Tetragonal and Cubic Tungsten Bronze Oxides. Angew Chem Int Ed Engl 2017; 56:5770-5773. [DOI: 10.1002/anie.201701732] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Yuya Ikeuchi
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Cédric Tassel
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Yoshihiro Goto
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Taito Murakami
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
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24
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Ikeuchi Y, Takatsu H, Tassel C, Goto Y, Murakami T, Kageyama H. High‐Pressure Synthesis of Fully Occupied Tetragonal and Cubic Tungsten Bronze Oxides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701732] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuya Ikeuchi
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Cédric Tassel
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Yoshihiro Goto
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Taito Murakami
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
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25
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Ghannadzadeh S, Licciardello S, Arsenijević S, Robinson P, Takatsu H, Katsnelson MI, Hussey NE. Simultaneous loss of interlayer coherence and long-range magnetism in quasi-two-dimensional PdCrO 2. Nat Commun 2017; 8:15001. [PMID: 28406142 PMCID: PMC5399288 DOI: 10.1038/ncomms15001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 02/16/2017] [Indexed: 11/11/2022] Open
Abstract
In many layered metals, coherent propagation of electronic excitations is often confined to the highly conducting planes. While strong electron correlations and/or proximity to an ordered phase are believed to be the drivers of this electron confinement, it is still not known what triggers the loss of interlayer coherence in a number of layered systems with strong magnetic fluctuations, such as cuprates. Here, we show that a definitive signature of interlayer coherence in the metallic-layered triangular antiferromagnet PdCrO2 vanishes at the Néel transition temperature. Comparison with the relevant energy scales and with the isostructural non-magnetic PdCoO2 reveals that the interlayer incoherence is driven by the growth of short-range magnetic fluctuations. This establishes a connection between long-range order and interlayer coherence in PdCrO2 and suggests that in many other low-dimensional conductors, incoherent interlayer transport also arises from the strong interaction between the (tunnelling) electrons and fluctuations of some underlying order. Incoherent transport is an important feature of many anisotropic quantum materials but often its origin is not well understood. Here, the authors show that in a layered quantum magnet, incoherence is driven by the interaction of electrons with spin fluctuations after the melting of magnetic order.
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Affiliation(s)
- S Ghannadzadeh
- High Field Magnet Laboratory (HFML-EMFL), Faculty of Science, Radboud University, Toernooiveld 7, 6525ED Nijmegen, The Netherlands.,Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands.,Oxford Instruments NanoScience, Tubney Woods, Abingdon, Oxfordshire OX13 5QX, UK
| | - S Licciardello
- High Field Magnet Laboratory (HFML-EMFL), Faculty of Science, Radboud University, Toernooiveld 7, 6525ED Nijmegen, The Netherlands.,Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands
| | - S Arsenijević
- High Field Magnet Laboratory (HFML-EMFL), Faculty of Science, Radboud University, Toernooiveld 7, 6525ED Nijmegen, The Netherlands.,Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands.,Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - P Robinson
- High Field Magnet Laboratory (HFML-EMFL), Faculty of Science, Radboud University, Toernooiveld 7, 6525ED Nijmegen, The Netherlands.,Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands
| | - H Takatsu
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.,Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - M I Katsnelson
- Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands
| | - N E Hussey
- High Field Magnet Laboratory (HFML-EMFL), Faculty of Science, Radboud University, Toernooiveld 7, 6525ED Nijmegen, The Netherlands.,Institute of Molecules and Materials, Faculty of Science, Radboud University, 6525 AJ Nijmegen, The Netherlands
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26
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Tóth S, Wehinger B, Rolfs K, Birol T, Stuhr U, Takatsu H, Kimura K, Kimura T, Rønnow HM, Rüegg C. Electromagnon dispersion probed by inelastic X-ray scattering in LiCrO 2. Nat Commun 2016; 7:13547. [PMID: 27882928 PMCID: PMC5123047 DOI: 10.1038/ncomms13547] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Accepted: 10/12/2016] [Indexed: 11/30/2022] Open
Abstract
Inelastic X-ray scattering with meV energy resolution (IXS) is an ideal tool to measure collective excitations in solids and liquids. In non-resonant scattering condition, the cross-section is strongly dominated by lattice vibrations (phonons). However, it is possible to probe additional degrees of freedom such as magnetic fluctuations that are strongly coupled to the phonons. The IXS spectrum of the coupled system contains not only the phonon dispersion but also the so far undetected magnetic correlation function. Here we report the observation of strong magnon–phonon coupling in LiCrO2 that enables the measurement of magnetic correlations throughout the Brillouin zone via IXS. We find electromagnon excitations and electric dipole active two-magnon excitations in the magnetically ordered phase and heavily damped electromagnons in the paramagnetic phase of LiCrO2. We predict that several (frustrated) magnets with dominant direct exchange and non-collinear magnetism show surprisingly large IXS cross-section for magnons and multi-magnon processes. Whilst terahertz optical spectroscopy allows for the study of coupled spin and lattice excitations, it is limited in momentum space. Here, the authors use inelastic x-ray scattering to demonstrate strong magnon-phonon coupling and electromagnon excitations across the Brillouin zone of LiCrO2.
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Affiliation(s)
- Sándor Tóth
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland.,Laboratory for Quantum Magnetism, Institute of Physics, EPFL, 1015 Lausanne, Switzerland
| | - Björn Wehinger
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland.,Department of Quantum Matter Physics, University of Geneva, 1211 Genève, Switzerland
| | - Katharina Rolfs
- Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Turan Birol
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.,Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
| | - Uwe Stuhr
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Hiroshi Takatsu
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.,Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Kenta Kimura
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
| | - Tsuyoshi Kimura
- Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
| | - Henrik M Rønnow
- Laboratory for Quantum Magnetism, Institute of Physics, EPFL, 1015 Lausanne, Switzerland
| | - Christian Rüegg
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen, Switzerland.,Department of Quantum Matter Physics, University of Geneva, 1211 Genève, Switzerland
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27
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Murakami T, Yamamoto T, Tassel C, Takatsu H, Ritter C, Ajiro Y, Kageyama H. HfMnSb2 : A Metal-Ordered NiAs-type Pnictide with a Conical Spin Order. Angew Chem Int Ed Engl 2016; 55:9877-80. [PMID: 27355989 DOI: 10.1002/anie.201602066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/08/2016] [Indexed: 11/07/2022]
Abstract
The NiAs-type structure is one of the most common structures in solids, but metal order has been almost exclusively limited to chalcogenides. The synthesis of HfMnSb2 is reported with a novel metal-ordered NiAs-type structure. HfMnSb2 undergoes a conical spin order below 270 K, in marked contrast to conventional magnetic order observed in NiAs-type pnictides. We argue that the layered arrangement of Hf and Mn makes it a quasi 2D magnet, where the Mn layers with localized magnetic moments (Mn(2+) ; S=5/2) can interact only through RKKY interactions, instead of metal-metal bonding that is otherwise dominant for typical NiAs-type pnictides. This result suggests that controlling order-disorder in NiAs-type pnictides enables a study of 2D-to-3D crossover behavior in itinerant magnetic system.
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Affiliation(s)
- Taito Murakami
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Takafumi Yamamoto
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Cédric Tassel
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Clemens Ritter
- Institut Laue-Langevin, 6, rue Jules Horowitz, Grenoble, 38000, France
| | - Yoshitami Ajiro
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering, Kyoto University, Kyoto, 615-8510, Japan.
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28
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Murakami T, Yamamoto T, Tassel C, Takatsu H, Ritter C, Ajiro Y, Kageyama H. HfMnSb
2
: A Metal‐Ordered NiAs‐type Pnictide with a Conical Spin Order. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Taito Murakami
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Takafumi Yamamoto
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Cédric Tassel
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Takatsu
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Clemens Ritter
- Institut Laue-Langevin 6, rue Jules Horowitz Grenoble 38000 France
| | - Yoshitami Ajiro
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Kageyama
- Graduate School of Engineering Kyoto University Kyoto 615-8510 Japan
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29
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Takatsu H, Onoda S, Kittaka S, Kasahara A, Kono Y, Sakakibara T, Kato Y, Fåk B, Ollivier J, Lynn JW, Taniguchi T, Wakita M, Kadowaki H. Quadrupole Order in the Frustrated Pyrochlore Tb_{2+x}Ti_{2-x}O_{7+y}. Phys Rev Lett 2016; 116:217201. [PMID: 27284670 DOI: 10.1103/physrevlett.116.217201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Indexed: 06/06/2023]
Abstract
A hidden order that emerges in the frustrated pyrochlore Tb_{2+x}Ti_{2-x}O_{7+y} with T_{c}=0.53 K is studied using specific heat, magnetization, and neutron scattering experiments on a high-quality single crystal. Semiquantitative analyses based on a pseudospin-1/2 Hamiltonian for ionic non-Kramers magnetic doublets demonstrate that it is an ordered state of electric quadrupole moments. The elusive spin liquid state of the nominal Tb_{2}Ti_{2}O_{7} is most likely a U(1) quantum spin-liquid state.
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Affiliation(s)
- H Takatsu
- Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - S Onoda
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - S Kittaka
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - A Kasahara
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Kono
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - T Sakakibara
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Y Kato
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - B Fåk
- Institute Laue Langevin, BP 156, F-38042 Grenoble, France
| | - J Ollivier
- Institute Laue Langevin, BP 156, F-38042 Grenoble, France
| | - J W Lynn
- NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
| | - T Taniguchi
- Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
| | - M Wakita
- Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
| | - H Kadowaki
- Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
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30
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Rastovski C, Dewhurst CD, Gannon WJ, Peets DC, Takatsu H, Maeno Y, Ichioka M, Machida K, Eskildsen MR. Anisotropy of the superconducting state in Sr2RuO4. Phys Rev Lett 2013; 111:087003. [PMID: 24010467 DOI: 10.1103/physrevlett.111.087003] [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: 05/22/2013] [Indexed: 06/02/2023]
Abstract
Despite intense studies the exact nature of the order parameter in superconducting Sr2RuO4 remains unresolved. We have used small-angle neutron scattering to study the vortex lattice in Sr2RuO4 with the field applied close to the basal plane, taking advantage of the transverse magnetization. We measured the intrinsic superconducting anisotropy between the c axis and the Ru-O basal plane (~60), which greatly exceeds the upper critical field anisotropy (~20). Our result imposes significant constraints on possible models of triplet pairing in Sr2RuO4 and raises questions concerning the direction of the zero spin projection axis.
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Affiliation(s)
- C Rastovski
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
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31
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Takatsu H, Ishikawa JJ, Yonezawa S, Yoshino H, Shishidou T, Oguchi T, Murata K, Maeno Y. Extremely large magnetoresistance in the nonmagnetic metal PdCoO2. Phys Rev Lett 2013; 111:056601. [PMID: 23952426 DOI: 10.1103/physrevlett.111.056601] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Indexed: 06/02/2023]
Abstract
Extremely large magnetoresistance is realized in the nonmagnetic layered metal PdCoO(2). In spite of a highly conducting metallic behavior with a simple quasi-two-dimensional hexagonal Fermi surface, the interlayer resistance reaches up to 35,000% for the field along the [11[over ¯]0] direction. Furthermore, the temperature dependence of the resistance becomes nonmetallic for this field direction, while it remains metallic for fields along the [110] direction. Such severe and anisotropic destruction of the interlayer coherence by a magnetic field on a simple Fermi surface is ascribable to orbital motion of carriers on the Fermi surface driven by the Lorentz force, but seems to have been largely overlooked until now.
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Affiliation(s)
- Hiroshi Takatsu
- Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
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32
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Hicks CW, Gibbs AS, Mackenzie AP, Takatsu H, Maeno Y, Yelland EA. Quantum oscillations and high carrier mobility in the delafossite PdCoO(2). Phys Rev Lett 2012; 109:116401. [PMID: 23005653 DOI: 10.1103/physrevlett.109.116401] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Indexed: 06/01/2023]
Abstract
We present de Haas-van Alphen and resistivity data on single crystals of the delafossite PdCoO(2). At 295 K we measure an in-plane resistivity of 2.6 μΩ cm, making PdCoO(2) the most conductive oxide known. The low-temperature in-plane resistivity has an activated rather than the usual T(5) temperature dependence, suggesting a gapping of effective scattering that is consistent with phonon drag. Below 10 K, the transport mean free path is ∼20 μm, approximately 10(5) lattice spacings and an astoundingly high value for flux-grown crystals. We discuss the origin of these properties in light of our data.
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Affiliation(s)
- Clifford W Hicks
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
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33
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Takatsu H, Kadowaki H, Sato TJ, Lynn JW, Tabata Y, Yamazaki T, Matsuhira K. Quantum spin fluctuations in the spin-liquid state of Tb₂Ti₂O₇. J Phys Condens Matter 2012; 24:052201. [PMID: 22156109 DOI: 10.1088/0953-8984/24/5/052201] [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] [Indexed: 05/31/2023]
Abstract
Neutron scattering experiments on a polycrystalline sample of the frustrated pyrochlore magnet Tb(2)Ti(2)O(7), which does not show any magnetic order down to 50 mK, have revealed that it shows condensation behavior below 0.4 K from a thermally fluctuating paramagnetic state to a spin-liquid ground state with quantum spin fluctuations. Energy spectra change from quasielastic scattering to a continuum with a double-peak structure at energies of 0 and 0.8 K in the spin-liquid state. Specific heat shows an anomaly at the crossover temperature.
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Affiliation(s)
- Hiroshi Takatsu
- Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
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34
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Takatsu H, Yonezawa S, Fujimoto S, Maeno Y. Unconventional anomalous hall effect in the metallic triangular-lattice magnet PdCrO₂. Phys Rev Lett 2010; 105:137201. [PMID: 21230802 DOI: 10.1103/physrevlett.105.137201] [Citation(s) in RCA: 7] [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: 03/27/2010] [Indexed: 05/30/2023]
Abstract
We experimentally reveal an unconventional anomalous Hall effect (UAHE) in a quasi-two-dimensional triangular-lattice antiferromagnet PdCrO₂. Using high quality single crystals of PdCrO₂, we found that the Hall resistivity ρ(xy) deviates from the conventional behavior below T*≃20 K, noticeably lower than T(N)=37.5 K, at which Cr³+ (S=3/2) spins order in a 120° structure. In view of the theoretical expectation that the spin chirality cancels out in the simplest 120° spin structure, we discuss required conditions for the emergence of UAHE within Berry-phase mechanisms.
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Affiliation(s)
- Hiroshi Takatsu
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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35
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Mori K, Hashimoto H, Takatsu H, Tsuda-Tsukimoto M, Kume T. Cocktail-substrate assay system for mechanism-based inhibition of CYP2C9, CYP2D6, and CYP3A using human liver microsomes at an early stage of drug development. Xenobiotica 2009; 39:415-22. [PMID: 19480547 DOI: 10.1080/00498250902822204] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
We established a mechanism-based inhibition cocktail-substrate assay system using human liver microsomes and drug-probe substrates that enabled simultaneous estimation of the inactivation of main cytochrome P450 (CYP) enzymes, CYP2C9, CYP2D6, and CYP3A, in drug metabolism. The inactivation kinetic parameters of typical mechanism-based inhibitors, tienilic acid, paroxetine, and erythromycin, for each enzyme in the cocktail-substrate assay were almost in agreement with the values obtained in the single-substrate assay. Using this system, we confirmed that multiple CYP inactivation caused by mechanism-based inhibitors such as isoniazid and amiodarone could be detected simultaneously. Mechanism-based inhibition potency can be estimated by the determination of the observed inactivation rate constants (k(obs)) at a single concentration of test compounds because the k(obs) of eleven CYP3A inactivators at 10 microM in the assay system nearly corresponded to k(inact)/K(I) values, an indicator of a compound's propensity to alter the activity of a CYP in vivo (R(2) = 0.97). Therefore, this cocktail-substrate assay is considered to be a powerful tool for evaluating mechanism-based inhibition at an early stage of drug development.
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Affiliation(s)
- K Mori
- Drug Metabolism and Pharmacokinetic Research Laboratory, Mitsubishi Tanabe Pharma Corporation, Toda, Japan
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Takatsu H, Takeuchi K, Umezu Y. A Novel Liquid Crystal Display: A Randomly-Oriented Nematic Liquid Crystal Display (RON-LCD). ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259308036219] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Takatsu H, Ohnishi H, Kobayashi K, Becker W, Seki M, Tazume M, Nakajima T, Saito H, Simon-Hettich B, Naemura S. Investigation Activity and Data on Safety of Liquid Crystal Materials. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587250108024986] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- H. Takatsu
- a Dainippon Ink & Chemicals, Inc. , 4472-1, Komuro, Inamachi, Kitaadachigun, Saitama , Japan
| | - H. Ohnishi
- a Dainippon Ink & Chemicals, Inc. , 4472-1, Komuro, Inamachi, Kitaadachigun, Saitama , Japan
| | - K. Kobayashi
- b Merck Japan Ltd. , 4084, Nakatsu, Aikawa-machi, Aiko-gun, Kanagawa , Japan
| | - W. Becker
- c Merck KGaA , Frankfurter Str. 250, 64293 , Darmstadt , Germany
| | - M. Seki
- d Chisso Corporation , 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo , Japan
| | - M. Tazume
- a Dainippon Ink & Chemicals, Inc. , 4472-1, Komuro, Inamachi, Kitaadachigun, Saitama , Japan
| | - T. Nakajima
- d Chisso Corporation , 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo , Japan
| | - H. Saito
- d Chisso Corporation , 7-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo , Japan
| | - B. Simon-Hettich
- c Merck KGaA , Frankfurter Str. 250, 64293 , Darmstadt , Germany
| | - S. Naemura
- b Merck Japan Ltd. , 4084, Nakatsu, Aikawa-machi, Aiko-gun, Kanagawa , Japan
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Abstract
Two new Daphniphyllum alkaloids, daphmanidins E (1) and F (2), have been isolated from the leaves of Daphniphyllum teijsmannii, and the structures were elucidated on the basis of spectroscopic data. Daphmanidins E and F showed a moderate vasorelaxant effect on rat aorta.
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Affiliation(s)
- Hiroshi Morita
- Faculty of Pharmaceutical Sciences, Hoshi University, Tokyo, Japan.
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Morita H, Ishioka N, Takatsu H, Shinzato T, Obara Y, Nakahata N, Kobayashi J. Daphmanidins C and D, Novel Pentacyclic Alkaloids fromDaphniphyllumteijsmanii. Org Lett 2005; 7:459-62. [PMID: 15673264 DOI: 10.1021/ol047641+] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [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: 11/29/2022]
Abstract
[structure: see text] Two novel alkaloids with an unprecedented fused-pentacyclic skeleton, daphmanidins C (1) and D (2), have been isolated from the leaves of Daphniphyllum teijsmanii, and the structures were elucidated on the basis of spectroscopic data. The relative stereochemistry of 1 and 2 was assigned by combination of NOESY correlations and a simulation analysis. Daphmanidin C (1) elevated activity of NGF biosynthesis.
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Affiliation(s)
- Hiroshi Morita
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
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Komatsuda A, Wakui H, Ohtani H, Maki N, Nimura T, Takatsu H, Yamaguchi A, Imai H, Sawada K. Amyloid A-type renal amyloidosis in a patient with sarcoidosis: report of a case and review of the literature. Clin Nephrol 2003; 60:284-8. [PMID: 14579945 DOI: 10.5414/cnp60284] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [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: 11/18/2022] Open
Abstract
A 53-year-old man developed chronic renal failure during a protracted course of sarcoidosis. A renal biopsy showed Congo red-positive homogenous deposits in the subendothelial space of glomerular capillary walls and arterial walls. On electron microscopy, amyloid fibrils were observed in the deposits. Immunohistochemistry showed positive staining for amyloid A (AA) protein. Treatment with prednisolone resulted in poor response, followed by progressive deterioration of renal function requiring hemodialysis. To our knowledge, there are 5 cases with histologically proven renal amyloidosis accompanied by sarcoidosis. Prognosis in these patients is extremely poor. AA-type amyloidosis should be considered as a rare renal complication in the setting of long-standing sarcoidosis.
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Affiliation(s)
- A Komatsuda
- Third Department of Internal Medicine, Akita University School of Medicine, Akita City, Akita, Jaan.
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Abstract
[structure: see text] Two cytotoxic quaternary Daphniphyllum alkaloids with an unprecedented fused-polycyclic skeleton containing a 1-azoniatetracyclo[5.2.2.0.(1,6)0.(4,9)]undecane ring system, daphniglaucins A (1) and B (2), have been isolated from the leaves of Daphniphyllum glaucescens. Their structures and relative stereochemistry were elucidated on the basis of spectroscopic data.
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Affiliation(s)
- Jun'ichi Kobayashi
- Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
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Takatsu H, Wada H, Maekawa N, Takemura M, Saito K, Fujiwara H. Significant reduction of 125 I-meta-iodobenzylguanidine accumulation directly caused by 1-methyl-4-phenyl-1,2,3,6-tetrahydroxypyridine, a toxic agent for inducing experimental Parkinson's disease. Nucl Med Commun 2002; 23:161-6. [PMID: 11891470 DOI: 10.1097/00006231-200202000-00008] [Citation(s) in RCA: 9] [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: 11/25/2022]
Abstract
A significant reduction of cardiac 123I-meta-iodobenzylguanidine (MIBG) accumulation has been reported in patients with idiopathic Parkinson's disease. However, it is unclear whether this reduction in cardiac sympathetic nerve is caused primarily or secondarily to the degeneration of sympathetic nerve centres which occurs in Parkinson's disease. Therefore, we examined neuronal 125I-MIBG accumulation in mice hearts of an experimental Parkinson's disease model and in sympathetic cells without any neuronal innervation. Cardiac accumulation of 125I-MIBG was determined 4h after intravenous injection of 125I-MIBG in mice pretreated with 1-methyl-4-phenyl-1,2,3,6-tetrahydroxypyridine (MPTP), an inducer of Parkinson's disease. In an in vitro study, uptake of 125I-MIBG was determined in a cultured pheochromocytoma cell line (PC-12), which was pretreated with MPTP. MPTP reduced MIBG accumulation mainly in its neuronal component of mice hearts, suggesting that MPTP impairs cardiac sympathetic nerves to uptake MIBG. Application of MPTP also caused near-complete blockade of 125I-MIBG accumulation in PC-12 cells. In the experimental PD models, it was shown that neuronal accumulation of MIBG was impaired by the direct action of MPTP to the sympathetic cells. These findings support the idea that cardiac sympathetic nerves are primarily impaired in Parkinson's disease despite the presence or absence of systemic autonomic failure.
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Affiliation(s)
- H Takatsu
- First Department of Internal Medicine, Gifu Municipal Hospital, Japan.
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Song H, Tasaki H, Yashiro A, Yamashita K, Toyokawa T, Nagai Y, Takatsu H, Taniguchi H, Nakashima Y. Dilated cardiomyopathy and Chlamydia pneumoniae infection. Heart 2001; 86:456-8. [PMID: 11559690 PMCID: PMC1729938 DOI: 10.1136/heart.86.4.456] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Kawasaki M, Takatsu H, Noda T, Ito Y, Kunishima A, Arai M, Nishigaki K, Takemura G, Morita N, Minatoguchi S, Fujiwara H. Noninvasive quantitative tissue characterization and two-dimensional color-coded map of human atherosclerotic lesions using ultrasound integrated backscatter: comparison between histology and integrated backscatter images. J Am Coll Cardiol 2001; 38:486-92. [PMID: 11499742 DOI: 10.1016/s0735-1097(01)01393-6] [Citation(s) in RCA: 129] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVES The purpose of the present study was to define clinicopathologically whether integrated backscatter (IB) combined with conventional two-dimensional echo (2DE) can differentiate the tissue characteristics of calcification (CL), fibrosis (FI), lipid pool (LP) with fibrous cap, intimal hyperplasia (IH) and thrombus (TH) and can construct two-dimensional tissue plaque structure in vivo. BACKGROUND It is difficult to characterize the components of plaque using conventional 2DE techniques. METHODS Integrated backscatter values of plaques were measured in the right common carotid and femoral arteries (total 24 segments) both during life and after autopsy in 12 patients (age 68 to 84 years, 10 men and two women). Integrated backscatter values were determined using a 5-12 MHz multifrequency transducer, setting the region of interests (ROIs) (11 x 11 pixels) on the echo tomography of the entire arterial wall (55 +/- 10 ROI/segment) and comparing it with histologic features in the autopsied arterial specimens. RESULTS Corrected IB values obtained before death and at autopsy were significantly correlated (r = 0.93, p < 0.01). Corresponding to the histologic features, corrected IB values on the rectangle ROIs obtained during life were divided into five categories: category 1 (TH) 4 < IB < or = 6; category 2 (media and IH or LP in the intima) 7 < IB < or = 13; category 3 (FI) 13 < IB < or = 18, category 4 (mixed lesion) 18 < IB < or = 27 and category 5 (CL) 28 < IB < or = 33. In category 2, media and intima were differentiated using conventional 2DE. Under the above procedures, color-coded maps constructed with IB-2DE obtained during life precisely reflected the histologic features of media and intima. CONCLUSIONS Integrated backscatter with 2DE represents a useful noninvasive tool for evaluating the tissue structure of human plaque.
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Affiliation(s)
- M Kawasaki
- Second Department of Internal Medicine, Gifu University School of Medicine, Japan
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Takatsu H, Katoh Y, Shiba Y, Nakayama K. Golgi-localizing, gamma-adaptin ear homology domain, ADP-ribosylation factor-binding (GGA) proteins interact with acidic dileucine sequences within the cytoplasmic domains of sorting receptors through their Vps27p/Hrs/STAM (VHS) domains. J Biol Chem 2001; 276:28541-5. [PMID: 11390366 DOI: 10.1074/jbc.c100218200] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.9] [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: 11/06/2022] Open
Abstract
GGA (Golgi-localizing, gamma-adaptin ear homology domain, ARF-binding) proteins are potential effectors of ADP-ribosylation factors, are associated with the trans-Golgi network (TGN), and are involved in protein transport from this compartment. By yeast two-hybrid screening and subsequent two-hybrid and pull-down analyses, we have shown that GGA proteins, through their VHS (Vps27p/Hrs/STAM) domains, interact with acidic dileucine sequences found in the cytoplasmic domains of TGN-localized sorting receptors such as sortilin and mannose 6-phosphate receptor. A mutational analysis has revealed that a leucine pair and a cluster of acidic residues adjacent to the pair are mainly responsible for the interaction. A chimeric receptor with the sortilin cytoplasmic domain localizes to the TGN, whereas the chimeric receptor with a mutation at the leucine pair or the acidic cluster is mislocalized to punctate structures reminiscent of early endosomes. These results indicate that GGA proteins regulate the localization to or exit from the TGN of the sorting receptors.
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Affiliation(s)
- H Takatsu
- Institute of Biological Sciences and Gene Experiment Center, University of Tsukuba, Tsukuba Science City, Ibaraki 305-8572, Japan
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Takatsu H, Tasaki H, Kim HN, Ueda S, Tsutsui M, Yamashita K, Toyokawa T, Morimoto Y, Nakashima Y, Adachi T. Overexpression of EC-SOD suppresses endothelial-cell-mediated LDL oxidation. Biochem Biophys Res Commun 2001; 285:84-91. [PMID: 11437376 DOI: 10.1006/bbrc.2001.5114] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [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: 11/22/2022]
Abstract
Reactive oxygen species have been proposed to play important roles in atherosclerosis. To investigate the protective role of extracellular superoxide dismutase (EC-SOD), its inhibition of endothelial-cell-mediated LDL oxidation was examined. We constructed the recombinant adenovirus AxCAEC-SOD expressing human EC-SOD by CAG promoter. Infection of endothelial cells with AxCAEC-SOD resulted in EC-SOD protein secretion in a dose-dependent manner and a decrease of endothelial-cell-derived superoxide production. Moreover, it was proven to coexist with heparan sulfate by immunohistochemical staining. Endothelial-cell-mediated LDL oxidation enhanced by ferric-sodium EDTA was inhibited by 47% in TBARS formation by AxCAEC-SOD infection. In agarose gel electrophoresis, AxCAEC-SOD decreased the negative charge of oxidized LDL by 50% and suppressed fragmentation of apolipoprotein B. These results suggested that human EC-SOD localized in the extracellular space and reduced endothelial-cell-mediated LDL oxidation. In subendothelial space, EC-SOD bound on heparan sulfate might suppress LDL oxidation through reduction of superoxide anion.
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Affiliation(s)
- H Takatsu
- Second Department of Internal Medicine, Occupational Pneumology, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishiku, Kitakyushu, Japan
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