Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe

Masashi Tanaka; Takuma Yamaki; Yoshitaka Matsushita; Masaya Fujioka; Saleem J. Denholme; Takahide Yamaguchi; Hiroyuki Takeya; Yoshihiko Takano

doi:10.1063/1.4915302

Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe

Superconductivity 2015-03-18 v2

Authors: Masashi Tanaka , Takuma Yamaki , Yoshitaka Matsushita , Masaya Fujioka , Saleem J. Denholme , Takahide Yamaguchi , Hiroyuki Takeya , Yoshihiko Takano

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Abstract

Single crystals of La(O,F)BiSSe were successfully grown by a CsCl flux method. Single crystal X-ray structural analysis revealed that the crystal structure is isostructural with BiS $_2$ - or BiSe $_2$ -based compounds with space group $P4/nmm$ (lattice parameters $a$ = 4.1110(2) {\AA}, $c$ = 13.6010(7) {\AA}). However, the S atoms are selectively occupied at the apical site of the Bi-SSe pyramids in the superconducting layer. The single crystals show a superconducting transition at 4.2 K in the magnetic susceptibility and resistivity measurement. The superconducting anisotropic parameter is determined to be 34 from its upper critical magnetic field. The anisotropy is in the same range with that of other members of the La(O,F)BiCh $_2$ ( $Ch$ = S, Se) family under ambient pressure.

Keywords

la(o,f)bisse site selectivity single crystal growth cscl flux method superconductivity anisotropy upper critical field

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@article{arxiv.1412.8387,
  title  = {Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe},
  author = {Masashi Tanaka and Takuma Yamaki and Yoshitaka Matsushita and Masaya Fujioka and Saleem J. Denholme and Takahide Yamaguchi and Hiroyuki Takeya and Yoshihiko Takano},
  journal= {arXiv preprint arXiv:1412.8387},
  year   = {2015}
}

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17 pages + 2 pages for supplement, 6 figures

Site Selectivity on Chalcogen Atoms in Superconducting La(O,F)BiSSe

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