Intrinsic Properties of $A$Fe2As2 ($A = \text{Ba}$, Sr) Single Crystal under Highly Hydrostatic Pressure Conditions
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概要
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We measured the electrical resistivity and ac magnetic susceptibility of BaFe2As2 and SrFe2As2 single crystals under pressure using a cubic anvil apparatus. For BaFe2As2, the antiferromagnetic (AF) and structural transitions are suppressed with increasing pressure. Unexpectedly, these transitions persist up to 8 GPa, and no signature of a superconducting transition was observed in the pressure range investigated here. On the other hand, the AF and structural transitions of SrFe2As2 collapse at around the critical pressure $P_{\text{C}} \sim 5$ GPa, resulting in the appearance of bulk superconductivity. The superconducting volume fraction abruptly increases above $P_{\text{C}}$, and shows a dome centered at approximately 6 GPa. Our results suggest that the bulk superconducting phase competes with the AF/orthorhombic phase and only appears in the narrow pressure region of the tetragonal phase.
- 2009-07-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Ohgushi Kenya
Institute For Solid State Physics University Of Tokyo
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Katayama Naoyuki
Institute For Solid State Physics The University Of Tokyo
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Uwatoko Yoshiya
Institute For Solid State Physics (issp) The University Of Tokyo
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Munakata Koji
Institute For Solid State Physics The University Of Tokyo
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Matsumoto Takehiko
Institute For Solid State Physics The University Of Tokyo
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Yamada Atsushi
Graduate School Of Science And Engineering Saitama University
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Munakata Koji
Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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Matsubayashi Kazuyuki
Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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Yamada Atsushi
Graduate School of Science and Engineering, Saitama University, Saitama 338-8570
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Ohgushi Kenya
Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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Matsumoto Takehiko
Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581
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Uwatoko Yoshiya
Institute for Solid State Physics
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Ohgushi Kenya
Institute for Solid State Physics
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