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

Research output: Contribution to journalArticlepeer-review

Abstract

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
Volume132
Issue number2
DOIs
StatePublished - 12 Jan 2024

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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