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In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure

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arxiv 1504.01208 v2 pith:YRUTZV5Z submitted 2015-04-06 cond-mat.supr-con cond-mat.str-el

Yoshikazu Mizuguchi , Akira Miura , Joe Kajitani , Takafumi Hiroi , Osuke Miura , Kiyoharu Tadanaga , Nobuhiro Kumada , Eisuke Magome
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Chikako Moriyoshi Yoshihiro Kuroiwa
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classification cond-mat.supr-concond-mat.str-el
keywords bich2-basedsuperconductorschemicalin-planepressurestructuresuperconductivitycrystal
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BiCh2-based superconductors (Ch: S, Se) are a new series of layered superconductor. However, mechanisms for the emergence of superconductivity in BiCh2-based superconductors have not been clarified. In this study, we have investigated crystal structure of two series of optimally-doped BiCh2-based superconductors, Ce1-xNdxO0.5F0.5BiS2 and LaO0.5F0.5Bi(S1-ySey)2, using powder synchrotron x-ray diffraction in order to reveal the relationship between crystal structure and superconducting properties of the BiCh2-based family. We have found that an enhancement of in-plane chemical pressure would commonly induce bulk superconductivity in both systems. Furthermore, we have revealed that superconducting transition temperature for REO0.5F0.5BiCh2 superconductors could universally be determined by degree of in-plane chemical pressure.

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