IR spectroscopy in tin and indium doped PbTe

ORAL

Abstract

Infrared spectroscopy is a powerful technique for probing the superconducting gap and low-energy excitations in superconducting materials. In this study, we investigate lead telluride (PbTe), with a focus on the superconducting behavior when doped with tin and indium. Using a novel continuous-wave far-infrared spectrometer in conjunction with specific heat measurements, we directly compare the measurements with predictions from the Mattis-Bardeen theory of surface impedance in superconductors. The results reveal deviations from the theoretical expectations, indicating the possible presence of unconventional collective excitation modes associated with superconductivity.

*Work at the University of Zagreb supported by the Ministry of Science, Education and Youth and Croatian Science Foundation under UIP-2020-02-9494. Work at the University of Minnesota supported by U.S. National Science Foundation under Award DMR-2214230.

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Presenters

  • Luka Rogic

    • University of Zagreb

Authors

  • Luka Rogic

    • University of Zagreb

  • Sarah Anderson

    • University of Minnesota

  • Issam Khayr

    • University of Minnesota Twin Cities
    • University of Minnesota

  • Xing He

    • University of Pennsylvania
    • University of Minnesota

  • Martin Greven

    • University of Minnesota
    • University of Minnesota Twin Cities

  • Damjan Pelc

    • University of Zagreb