Intrinsic Phase Diagram of Superconductivity in the BiCh2-Based System Without In-Plane Disorder

We have investigated the crystal structure and physical properties of LaO1-xFxBiSSe to reveal the intrinsic superconductivity phase diagram of the BiCh2-based layered compound family. From synchrotron X-ray diffraction and Rietveld refinements with anisotropic displacement parameters, we clearly fou...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2017-07, Vol.86 (7)
Main Authors: Nagasaka, Kouhei, Nishida, Atsuhiro, Jha, Rajveer, Kajitani, Joe, Miura, Osuke, Higashinaka, Ryuji, Matsuda, Tatsuma D, Aoki, Yuji, Miura, Akira, Moriyoshi, Chikako, Kuroiwa, Yoshihiro, Usui, Hidetomo, Kuroki, Kazuhiko, Mizuguchi, Yoshikazu
Format: Article
Language:English
Subjects:
Crystal structure
Diffraction
Physical properties
Superconductivity
Superconductors
Transition temperature
X-ray diffraction
Online Access:Get full text
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Summary:We have investigated the crystal structure and physical properties of LaO1-xFxBiSSe to reveal the intrinsic superconductivity phase diagram of the BiCh2-based layered compound family. From synchrotron X-ray diffraction and Rietveld refinements with anisotropic displacement parameters, we clearly found that the in-plane disorder in the BiSSe layer was fully suppressed for all x. In LaO1-xFxBiSSe, metallic conductivity and superconductivity are suddenly induced by electron doping even at x = 0.05 and 0.1 with a monoclinic structure. In addition, x (F concentration) dependence of the transition temperature (Tc) for x = 0.2-0.5 with a tetragonal structure shows an anomalously flat phase diagram. With these experimental facts, we have proposed the intrinsic phase diagram of the ideal BiCh2-based superconductors with less in-plane disorder.
ISSN:0031-9015
1347-4073
DOI:10.7566/jpsj.86.074701