論文

査読有り
2016年3月

Correlation of superconductivity with crystal structure in (NH3)(y)CsxFeSe

PHYSICAL REVIEW B
  • Lu Zheng
  • ,
  • Xiao Miao
  • ,
  • Yusuke Sakai
  • ,
  • Hidenori Goto
  • ,
  • Eri Uesugi
  • ,
  • Ritsuko Eguchi
  • ,
  • Saki Nishiyama
  • ,
  • Kunihisa Sugimoto
  • ,
  • Akihiko Fujiwara
  • ,
  • Yoshihiro Kubozono

93
10
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.93.104508
出版者・発行元
AMER PHYSICAL SOC

The superconducting transition temperature T-c of ammoniated metal-doped FeSe (NH3)(y)MxFeSe (M: metal atom) has been scaled with the FeSe plane spacing, and it has been suggested that the FeSe plane spacing depends on the location of metal atoms in (NH3)(y)MxFeSe crystals. Although the crystal structure of (NH3)(y)LixFeSe exhibiting a high T-c (similar to 44 K) was determined from neutron diffraction, the structure of (NH3)(y)MxFeSe exhibiting a low T-c (similar to 32 K) has not been determined thus far. Here, we determined the crystal structure of (NH3)(y)Cs0.4FeSe (T-c = 33 K) through the Rietveld refinement of the x-ray diffraction (XRD) pattern measured with synchrotron radiation at 30 K. The XRD pattern was analyzed based on two different models, on-center and off-center, under a space group of 14/mmm. In the on-center structure, the Cs occupies the 2a site and the N of NH3 may occupy either the 4c or 2b site, or both. In the off-center structure, the Cs may occupy either the 4c or 2b site, or both, while the N occupies the 2a site. Only an on-center structure model in which the Cs occupies the 2a and the N of NH3 occupies the 4c site provided reasonable results in the Rietveld analysis. Consequently, we concluded that (NH3)(y)Cs0.4FeSe can be assigned to the on-center structure, which produces a smaller FeSe plane spacing leading to the lower T-c.

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.93.104508
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000371732500002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.93.104508
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000371732500002

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