Direct measurements of diamagnetism in few-layer van der Waals superconductors

ORAL

Abstract

Thermodynamic properties of few-layer van der Waals superconductors are not well characterized, due to the small volume of the exfoliated devices. Here, we report direct measurement of the diamagnetism of few-layer NbSe2 and ionic gated MoS2 devices. By utilizing a scanning SQUID susceptometer, we report the temperature, magnetic field, and frequency dependence of the susceptibility of the superconductor. We observe signatures suggestive of a broadened vortex binding unbinding transition, and discuss the relation of this transition to the Berenzinskii-Kosterlitz-Thouless (BKT) transition. We report efforts to extract superconducting parameters from the temperature dependence of the magnetic response.

*This work was supported by the NSF (DMR-2004864) and the Cornell Center for Materials Research with funding from the NSF MRSEC program (DMR-1719875). This work was performed in part at the Cornell NanoScale Facility, an NNCI member supported by NSF Grant NNCI-2025233.

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Presenters

  • Alexander Jarjour

    • Cornell University

Authors

  • Alexander Jarjour

    • Cornell University

  • Lizhong Li

    • Cornell University

  • George M Ferguson

    • Cornell University

  • Brian T Schaefer

    • Cornell University

  • Kin Fai Mak

    • Cornell University

  • Jie Shan

    • Cornell University
    • Cornell

  • Katja Nowack

    • Cornell University