Superconductivity Study of LaO$_{0.5}$F$_{0.5}$BiS$_2$ using Nuclear Magnetic Resonance
ORAL
Abstract
LaO$_{0.5}$F$_{0.5}$BiS$_2$ is a member of the recently discovered class of BiS$_2$-layered superconductors. It has a superconducting temperature $T_c$ close to 3~K when prepared under normal conditions. Pressure makes $T_c$ as high as 10~K.\ $T_c$ is also close to 10~K at ambient pressure for samples synthesized under pressure (2~GPa). We are conducting a $^{19}$F-NMR study in a polycrystalline powder of LaO$_{0.5}$F$_{0.5}$BiS$_2$ ($T_c\sim$3~K). We report static and dynamic NMR parameters as functions of temperature, between 1.8 and 300 K. Our data show changes of sample behavior on cooling below both 10 and 3 K, and a modulation on the spin-echo-amplitude decay, which we discuss in some detail.
*NSF/DMR-1105380 (Cal State LA ) and the NSF of China, grant 1147060 (Fudan U)
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Authors
Shrishti Yadav
California State University, Los Angeles
Oscar Bernal
Department of Physics, CSU Los Angeles
California State University, Los Angeles
Lei Shu
Fudan University, Shangahi, China
Department of Physics, Fudan University
Fudan University, Shanghai
Jian Zhang
Department of Physics, Fudan University
Fudan University, Shanghai
Duygu Yazici
University of California, San Diego
University of California, San Diego, La Jolla, CA
Kevin Huang
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, USA
Department of Physics, Fudan University
University of California, San Diego, La Jolla, CA
M. B. Maple
UC San Diego
Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, USA
