Quantum fluctuations in iron-pnictide superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$

ORAL

Abstract

Muon-spin-relaxation/rotation ($\mu$SR) experiments were performed on single crystals of iron-pnictide superconductors BaFe$_2$(As$_{1-x}$P$_x$)$_2$ ($x = 0.28, 0.30$, and 0.33). Our preliminary results reveal that the static muon relaxation rate from ZF-$\mu$SR measurements is temperature independent through $T_c$, suggesting that time reversal symmetry is preserved in the superconducting state. Above $T_c$, the field dependence of muon relaxation rate shows NFL behaviors for optimal composition $x=0.3$. A maximum of zero temperature penetration depth at $x=0.3$ is also observed.

*This work was supported by Chinese NSF, grant 1147060, US NSF, grant DMR-1506677 and DMR-1105380.

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Authors

  • Lei Shu

    • Fudan University, Shangahi, China
    • Department of Physics, Fudan University
    • Fudan University, Shanghai

  • Z. F. Ding

    • Fudan University, Shangahi, China

  • J. Zhang

    • Fudan University, Shangahi, China

  • C. Tan

    • Fudan University, Shangahi, China

  • K. Huang

    • Fudan University, Shangahi, China

  • L. Liu

    • Columbia University

  • S. Cheung

    • Columbia University

  • Y. J. Uemura

    • Columbia University

  • D. E. MacLaughlin

    • University of Riverside

  • O. O. Bernal

    • California State University, Los Angeles

  • P.-C. Ho

    • California State University, Fresno

  • D. Hu

    • Chinese Academy of Sciences

  • P.C. Dai

    • Rice University