Double-Coil Mutual Inductance Measurements of Superfluid Density in PbSnTe/FeTe Heterostructures

ORAL

Abstract

We employ an ultra-high-vacuum double-coil mutual inductance (DCMI) setup to measure the superfluid density (SFD) in molecular beam epitaxy (MBE)-grown Pb1-xSnxTe/FeTe superconducting heterostructures. The DCMI technique detects variations in mutual inductance as a conducting sheet screens an applied AC field, allowing extraction of the complex sheet conductance. The imaginary component of induced voltage corresponds to SFD, while the real part indicates dissipation. For all heterostructures with varying x, the SFD vanishes at Tc ≈ 10–11 K, consistent with transport results, and the real component exhibits a Gaussian-like peak near Tc . The pronounced and uniform screening confirms macroscopically homogeneous superconductivity, providing a quantitative benchmark for superconducting properties in FeTe-based heterostructures.

*Y.Y.L., Y.X.L., X.Y.W., and C.-K.S. would like to acknowledge support from the NSF (Grant Nos. DMR-1808751 and DMR-2219610). Z.-J.Y., H.T.R., P.X., and C.-Z.C. are supported by the DOE grant (DE-SC0023113) and the Gordon and Betty Moore Foundation’s EPiQS Initiative (Grant GBMF9063 to C. -Z. C.).

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Presenters

  • Yiyuan Luo

    • University of Texas at Austin

Authors

  • Yiyuan Luo

    • University of Texas at Austin

  • Zi-Jie Yan

    • Pennsylvania State University

  • Yanxing Li

    • Princeton University
    • University of Texas at Austin

  • Xiaoyu Wei

    • University of Texas at Austin

  • Hongtao Rong

    • The Pennsylvania State University
    • Pennsylvania State University

  • Pu Xiao

    • Pennsylvania State University
    • The Pennsylvania State University

  • Cui-Zu Chang

    • Pennsylvania State University

  • Chih-Kang Shih

    • University of Texas at Austin