Superfluid response of an atomically thin gate-tuned van der Waals superconductor

Alexander Jarjour, G. M. Ferguson, Brian T. Schaefer, Menyoung Lee, Yen Lee Loh, Nandini Trivedi and Katja C. Nowack ()
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Alexander Jarjour: Cornell University
G. M. Ferguson: Cornell University
Brian T. Schaefer: Cornell University
Menyoung Lee: Kavli Institute at Cornell for Nanoscale Science
Yen Lee Loh: University of North Dakota
Nandini Trivedi: The Ohio State University
Katja C. Nowack: Cornell University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract A growing number of two-dimensional superconductors are being discovered in the family of exfoliated van der Waals materials. Due to small sample volume, the superfluid response of these materials has not been characterized. Here, we use a local magnetic probe to directly measure this key property of the tunable, gate-induced superconducting state in MoS2. We find that the backgate changes the transition temperature non-monotonically whereas the superfluid stiffness at low temperature and the normal state conductivity monotonically increase. In some devices, we find direct signatures in agreement with a Berezinskii-Kosterlitz-Thouless transition, whereas in others we find a broadened onset of the superfluid response. We show that the observed behavior is consistent with disorder playing an important role in determining the properties of superconducting MoS2. Our work demonstrates that magnetic property measurements are within reach for superconducting devices based on exfoliated sheets and reveals that the superfluid response significantly deviates from simple BCS-like behavior.

Date: 2023
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DOI: 10.1038/s41467-023-37210-8

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