Field dependence of antiferromagnetic spin fluctuations in the heavy fermion superconductor CeCoIn$_5$

ORAL

Abstract

Magnetic fields are proposed as a tuning parameter for quantum critical fluctuations in the heavy fermion superconductor CeCoIn$_5$, with a critical point close to the superconducting $B_{c2}$. Here, $^{59}$Co NMR spin lattice relaxation is used to study the effect of magnetic field applied on the amplitude, dimensionality, and anisotropy of antiferromagnetic spin fluctuations for temperatures covering $T$=100mK-100K and $B=$5-10T ($\parallel {\mathbf c}$). Spin fluctuations are evident for temperatures below $T\sim40$K, below which $[T_1T]^{-1}$ increases markedly for all fields. At lower temperatures, a significant dependence on magnetic field is observed. For fields $B>B_{c2}=$5T, $[T_1T]^{-1}\to$constant for $T

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Authors

  • S. E. Brown

    • UCLA Physics and Astronomy
    • UCLA
    • Phys. \& Astron., UCLA
    • University of California, Los Angeles

  • H. Sakai

    • Los Alamos National Laboratory

  • S.-H. Baek

    • Los Alamos National Laboratory

  • Filip Ronning

    • Los Alamos National Laboratory
    • LANL

  • Eric D. Bauer

    • Los Alamos National Laboratory, New Mexico, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
    • Los Alamos National Lab

  • J.D. Thompson

    • Los Alamos National Laboratory
    • LANL
    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA