Increase in Tc and change of crystal structure by high-pressure annealing in BiS2-based superconductor CeO0.3F0.7BiS2

Abstract

Recently, several types of BiS2-based superconductor such as Bi4O4S3, REO1-xFxBiS2 (RE: rare earth) and Sr1-xLaxFBiS2 have been discovered. In this study, we have investigated the crystal structure and the superconducting properties for two kinds of polycrystalline samples (As-grown and high-pressure-annealed samples) of the BiS2-based superconductor CeO0.3F0.7BiS2. We found that both the As-grown and the high-pressure-annealed CeO0.3F0.7BiS2 samples show bulk superconductivity. A higher Tc was observed in the high-pressure-annealed sample. The Tc of CeO0.3F0.7BiS2 increased from Tczero = 2.7 K to Tczero = 3.7 K by high-pressure annealing. The lattice constant of a and c axis did not show remarkable differences between the As-grown and the high-pressure-annealed samples. Nevertheless, the peak symmetry of the (200) peak seemed to become more symmetric while the (004) peak did not show such a difference, indicating that the crystal structure within the ab plane changed to a higher-symmetric phase, a perfect tetragonal, by high-pressure annealing in CeO0.3F0.7BiS2.

arXiv comment13 pages, 3 figures. Submitted to ICSM2014 proceedings

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Cited by in corpus (8)

• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Effect of hydrostatic pressures on the superconductivity of new BiS2 based REO0.5F0.5BiS2 (RE-La, Pr and Nd) superconductors
• Pressure enhanced superconductivity at 10 K in La doped EuBiS2F
• Electronic and magnetic properties of superconducting LnO${}_{1-x}$F${}_x$BiS${}_2$ (Ln = La, Ce, Pr, and Nd) from first principles
• Significant enhancement of superconductivity under hydrostatic pressure in CeO0.5F0.5BiS2 superconductor
• Upper critical magnetic field of $Ln$O${}_{0.5}$F${}_{0.5}$BiS${}_2$ ($Ln$ = La, Nd) superconductors at ambient and high pressure
• High pressure effects on La(O,F)BiS${}_2$ single crystal using diamond anvil cell with dual-probe diamond electrodes
• Pressure-induced enhancement of two-dimensionality in LaO1-xFxBi(Se/S)2 superconductors