Nernst Sign Reversal in the Hexatic Vortex Phase of Weakly Disordered a-MoGe Thin Films

Y. Wu, A. Roy, S. Dutta, J. Jesudasan, P. Raychaudhuri, A. Frydman

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The hexatic phase is an intermediate stage in the melting process of a 2D crystal due to topological defects. Recently, this exotic phase was experimentally identified in the vortex lattice of 2D weakly disordered superconducting MoGe by scanning tunneling microscopic measurements. Here, we study this vortex state by the Nernst effect, which is an effective and sensitive tool to detect vortex motion, especially in the superconducting fluctuation regime. We find a surprising Nernst sign reversal at the melting transition of the hexatic phase. We propose that they are a consequence of vortex dislocations in the hexatic state which diffuse preferably from the cold to hot.

Original languageEnglish
Article number026003
JournalPhysical Review Letters
Issue number2
StatePublished - 12 Jan 2024

Bibliographical note

Publisher Copyright:
© 2024 American Physical Society.


The authors would like to thank D. P. Arovas, A. Auerbach, E. Shimshoni, and V. Vinokour for valuable discussions and I. Volotsenko and G. N. Daptary for technical help. This research was supported by The Israel Science Foundation, ISF Grants No. 3192/19 and No. 1499/21.

FundersFunder number
Israel Science Foundation1499/21, 3192/19


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