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.

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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, University of California San Diego, University of California, San Diego, University of California, San Diego, La Jolla, CA