Superconductivity in a new layered bismuth oxyselenide: LaO0.5F0.5BiSe2

We report superconductivity at Tc ≈ 2.6 K in a new layered bismuth oxyselenide LaO0.5F0.5BiSe2 with the ZrCuSiAs-type structure composed of alternating superconducting BiSe2 and blocking LaO layers. The superconducting properties of LaO0.5F0.5BiSe2 were investigated by means of dc magnetization, resistivity and muon-spin rotation experiments, revealing the appearance of bulk superconductivity with a rather large superconducting volume fraction of ≈ 70% at 1.8 K.

[1]  Y. Tokura,et al.  Insulator-to-Superconductor Transition upon Electron Doping in a BiS2-Based Superconductor Sr1¹xLaxFBiS2 , 2013, 1311.5117.

[2]  Guangtao Wang,et al.  The electronic structure of novel BiS2-based layered superconductor , 2013 .

[3]  A. Amato,et al.  Low superfluid density and possible multigap superconductivity in the BiS2-based layered superconductor Bi4O4S3 , 2013, 1309.7282.

[4]  M. Nagao,et al.  Structural Analysis and Superconducting Properties of F-Substituted NdOBiS2 Single Crystals , 2013, 1309.6400.

[5]  M. Maple,et al.  Enhancement of superconductivity near the pressure-induced semiconductor–metal transition in the BiS2-based superconductors LnO0.5F0.5BiS2 (Ln = La, Ce, Pr, Nd) , 2013, Journal of physics. Condensed matter : an Institute of Physics journal.

[6]  M. Maple,et al.  Pressure-induced enhancement of superconductivity and suppression of semiconducting behavior in L n O 0.5 F 0.5 BiS 2 ( L n = La ,Ce) compounds , 2013, 1307.4157.

[7]  M. Maple,et al.  Superconductivity induced by electron doping in La 1-x M x OBiS 2 (M= Ti, Zr, Hf, Th) , 2013, 1303.6216.

[8]  Y. Takahide,et al.  New Member of BiS2-Based Superconductor NdO1-xFxBiS2 , 2013 .

[9]  M. Maple,et al.  Superconductivity of F-substituted LnOBiS2 (Ln=La, Ce, Pr, Nd, Yb) compounds , 2013, 1301.3932.

[10]  T. Yildirim.  Ferroelectric soft phonons, charge density wave instability, and strong electron-phonon coupling in BiS 2 layered superconductors: A first-principles study , 2012, 1210.2418.

[11]  Kefeng Wang,et al.  New layered fluorosulfide SrFBiS2. , 2012, Inorganic chemistry.

[12]  Anuj Kumar,et al.  Synthesis and Superconductivity of New BiS2 Based Superconductor PrO0.5F0.5BiS2 , 2012, 1208.5873.

[13]  H. Feng,et al.  Superconductivity in Bismuth Oxysulfide Bi4O4S3 , 2012, 1208.2818.

[14]  Shruti,et al.  Bulk superconductivity in bismuth oxysulfide Bi4O4S3. , 2012, Journal of the American Chemical Society.

[15]  A. Suter,et al.  Musrfit: A Free Platform-Independent Framework for μSR Data Analysis , 2011, 1111.1569.

[16]  Hideo Hosono,et al.  Iron-based layered superconductor La[O(1-x)F(x)]FeAs (x = 0.05-0.12) with T(c) = 26 K. , 2008, Journal of the American Chemical Society.

[17]  V. Pomjakushin,et al.  High-resolution powder diffractometer HRPT for thermal neutrons at SINQ , 2000 .

[18]  Juan Rodríguez-Carvajal,et al.  Recent advances in magnetic structure determination by neutron powder diffraction , 1993 .

[19]  E. Mitchell,et al.  Muon Spin Rotation Spectroscopy Principles and Applications in Solid State Physics , 1985 .