First-Order Phase Transition at the Curie Temperature in MnAs and MnAs_<0.9>Sb_<0.1>(Condensed matter: structure and mechanical and thermal properties)
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概要
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Structural transformations of MnAs and MnAs_<0.9>Sb_<0.1> were investigated by X-ray diffraction in high magnetic fields up to 5T. The temperature dependence of the magnetization was measured in a magnetic field of 0.01T and the Curie temperature T_C was determined to be 315K for MnAs and 290K for MnAs_<0.9>Sb_<0.1> during heating process. For both compounds, a metamagnetic transition from a paramagnetic to a ferromagnetic state was observed above T_C. The X-ray diffraction profile at 319K for MnAs showed a single phase of an orthorhombic MnP-type structure in zero field. An applied magnetic field of 3T induced the appearance of a hexagonal NiAs-type structure. On further increase of the magnetic field, a single phase with a hexagonal structure was realized above 3.5T in a forced-ferromagnetic state. The X-ray diffraction profile at 295K for MnAs_<0.9>Sb_<0.1> showed a hexagonal NiAstype structure. The coexistence of ferromagnetic and paramagnetic states with different lattice parameters was confirmed in a magnetic field of 2.5T. The volume expansion induced by a magnetic field was found to be 2.1% for MnAs and 1.1% for MnAs_<0.9>Sb_<0.1>.
- 社団法人日本物理学会の論文
- 2006-08-15
著者
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Wada Hirofumi
Department of Materials Science and Engineering,Kyoto University
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和田 裕文
九大院理
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和田 裕文
九大理
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和田 裕文
九州大
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KOYAMA Keiichi
High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku Univer
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WATANABE Kazuo
High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku Univer
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Watanabe K
Institute For Materials Research Tohoku University
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KOBAYASHI Keisuke
Japan Synchrotron Radiation Research Institute/SPring-8
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Koyama K
Institute For Solid State Physics University Of Tokyo
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Wadati H.
Department Of Physics And Astronomy University Of British Columbia
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Koyama K
Institute For Solid State Physics University:(present)institute Of Materials Research Tohoku Univers
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Ishikawa Fumihiro
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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ASANO Tetsuya
Department of Materials Science and Engineering, Kyoto University
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Asano Tetsuya
Department Of Materials Science And Engineering Kyoto University
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Koyama Keiichi
High Field Lab. For Superconducting Materials Inst. For Materials Res. Tohoku Univ.
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Wada Hirofumi
Department Materials Science And Engineering Kyoto University
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Kajita K
Department Of Physics Faculty Of Science Toho University
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Watanabe Kazuo
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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Koyama Keiichi
Tohoku Univ. Sendai Jpn
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Watanabe Kazuo
Institute For Materials Research Tohoku University Crest Japan Science And Technology Corporation
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Watanabe Kazuo
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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Watanabe Kazuo
High Field Laboratory For Superconducting Materials Imr Tohoku University
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Koyama Keiichi
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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Koyama Keiichi
Department of Physics, Faculty of Science, Toho University
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KOYAMA Keiichi
High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University
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WATANABE Kazuo
High Field Lab. for Superconducting Materials, Institute for Materials Research, Tohoku University
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