Nonlinear susceptibility of unconventional superconductors

ORAL

Abstract

Nonlinear magnetic response can be used to investigate several important features of superconductors: the pre-pairing regime above Tc, the superconducting gap features through the low-temperature nonlinear Meissner effect, and time-reversal symmetry. Based on our work on the superconducting precursor in oxides [1,2], we present complementary experiments on a wide range of conventional and unconventional superconductors. Several characteristic types of behavior are observed, including mean-field Ginzburg-Landau nonlinear response, an inhomogeneity-dominated precursor, and strong fluctuations not described by mean-field theory.

[1] D. Pelc et al., Nat. Comm. 9, 4327 (2018)
[2] D. Pelc et al., arxiv:1808.05763 (2018)

*This work was funded by the DOE through the University of Minnesota Center for Quantum Materials under DE-SC-0016371.

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Presenters

  • Damjan Pelc

    • University of Minnesota

Authors

  • Damjan Pelc

    • University of Minnesota

  • Zachary Anderson

    • University of Minnesota
    • Physics and Astronomy, University of Minnesota

  • Biqiong Yu

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota

  • Sajna Hameed

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota

  • Martin Greven

    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota
    • Physics and Astronomy, University of Minnesota