BiS2-based layered superconductor Bi4O4S

Yoshikazu Mizuguchi

¹

,

Hiroshi Fujihisa

²

,

Yoshito Gotoh

³

et al.

Synthesis and Properties of SmO0.5F0.5BiS2 and Enhancement in Tc in La1–ySmyO0.5F0.5BiS2

“…This article follows from our work related to a recent class of superconductors, Bi 4 O 4 S 3 and LnOBiS 2 which have some structural similarity to the important LnOFeAs class of superconductors. [7][8][9][10] For example both these systems crystallize in the same space group (P4/nmm), they have layered structure with a charge reservoir layer (LnO) and a superconducting layer (BiS 2 , Fe-As), their parent phases are semiconducting or poorly conducting and, most importantly, they become superconducting upon electron-doping (doping F -for O 2-or a tetravalent ion for Ln). [9][10][11][12][13][14][15][16][17] Superconductivity by fluorine -doping in LaO 1-x F x BiS 2 was first reported by Mizuguchi et al (T c ~ 2.5 K) 9 ( T c ~10 K could be achieved by high pressure synthesis).…”

Superconducting Fiber with Transition Temperature up to 7.43 K in Nb2PdxS5−δ (0.6 < x <1)

“…For practical uses, it is very important that a superconducting material is flexible. [4][5][6][7][8][9][10][11] Despite of the relatively lower superconducting transition temperature (less than 10 K), their discovery attracts much attention due to their potential application perspectives and scientific importance. Here we report the growth and the characterization of Nb 2 Pd x S 5- (0.6<x<1) superconducting fibers by using traditional flux-melting method.…”

Bulk Superconductivity in Bismuth Oxysulfide Bi4O4S3

“…ABSTRACT: Very recent report 1 on observation of superconductivity in Bi 4 O 4 S 3 could potentially reignite the search for superconductivity in a broad range of layered sulfides. We report here synthesis of Bi 4 O 4 S 3 at 500 0 C by vacuum encapsulation technique and its basic characterizations.…”

“…The structure of Bi 4 O 4 S 3 is still under debate within the space group crystallization of I4/mmm or I -42m 1 . The representative unit cell of the compound in I4/mmm space group crystallization is shown in Figure 1 (b).…”