Appearance of superconductivity in layered LaO0.5F0.5BiS2

被引：109

作者：

Awana, V. P. S. ^{[1
]}

Kumar, Anuj ^{[1
]}

Jha, Rajveer ^{[1
]}

Singh, Shiva Kumar ^{[1
]}

Pal, Anand ^{[1
]}

Shruti ^{[2
]}

Saha, J. ^{[2
]}

Patnaik, S. ^{[2
]}

机构：

[1] CSIR, Natl Phys Lab, Quantum Phenomena & Applicat Div, New Delhi 110012, India

[2] Jawaharlal Nehru Univ, Sch Phys Sci, New Delhi 110067, India

来源：

SOLID STATE COMMUNICATIONS | 2013年 / 157卷

关键词：

New layered superconductor; Bismuth sulfide layer; Magnetization; Magneto-transport;

D O I：

10.1016/j.ssc.2012.11.021

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Phase pure samples of LaOBiS2 and LaO0.5F0.5BiS2 are synthesized by conventional solid state reaction route via vacuum encapsulation technique at 800 degrees C for 12 h. Both the samples are crystallized in tetragonal P4/nmm space group with lattice parameters a=4.066(1) angstrom, c=13.862(4) angstrom for LaOBiS2; a=4.069(5) angstrom, c=13.366(2) angstrom for LaO0.5F0.5BiS2. Bulk superconductivity is confirmed in LaO0.5F0.5BiS2 with superconducting transition temperature (T-c) of 2.7 K by DC magnetization and resistivity measurements. The isothermal magnetization (M-H) measurement shows closed loops with clear signatures of flux pinning and irreversible behavior. The magneto-transport rho(T,H) measurements show resistive broadening and decrease in T-c(rho= 0) to the lower temperature with increasing magnetic field. The magnetic phase diagram involving upper critical and irreversibility fields as a function of temperature has been ascertained. The upper critical field H-c2(0) is estimated to be similar to 19 kOe corresponding to a Ginzburg-Landau coherence length of similar to 130 angstrom. (c) 2013 Published by Elsevier Ltd.

引用

页码：21 / 23

页数：3

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