Spatially resolved NMR spectra for the Swiss cheese model in heavy fermion PuCoGa$_5$ superconductor

POSTER

Abstract

Spatially resolved NMR experiments, which probe the local electronic excitations, play a vital role for studying the pairing symmetry of unconventional superconductors. Here we calculate the spatial modulation of the NMR spin-lattice relaxation rate (1/T1) for the Swiss cheese model as a function of impurity concentration in PuCoGa5 superconductor. The local suppression of the superconducting order parameter due to impurities is related to the number of holes in the Swiss cheese model. Our results indicate that Friedel-like oscillations,as seen in the local-density of states near an impurity, are also present in the behavior of 1/T1 as one moves away from the impurity site. We demonstrate that the gap nodes, which are filled by disorder, can be probed by NMR through the local information encoded in the spectra. The advantage of spatially resolved NMR compared to STM measurements is that the former probe is not sensitive to surface states. Work is supported by US DOE.

Authors

  • Tanmoy Das

    • LANL
    • Theoretical Division, Los Alamos National Laboratory
    • Northeastern U and LANL

  • Jian-Xin Zhu

    • Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
    • Los Alamos National Lab, Theoretical Division
    • Los Alamos National Laboratory, Los Alamos, NM 87545
    • Theoretical Division, Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545
    • Los Alamos National Laboratory

  • Alexander Balatsky

    • Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nano-Technologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
    • LANL
    • Theoretical Division, Los Alamos National Laboratory and Center for Integrated Nanotechnologies, Los Alamos, NM 87545
    • Los Alamos National Lab
    • Theoretical Division, Los Alamos National Laboratory

  • Matthias Graf

    • Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory