Unusual nernst effect suggesting time-reversal violation in the striped cuprate superconductor La 2-xBa xCuO 4

Lu Li, N. Alidoust, J. M. Tranquada, G. D. Gu, N. P. Ong

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Abstract

The striped cuprate La 2-xBa xCuO 4 (x=18) undergoes several transitions below the charge-ordering temperature T co=54K. From Nernst experiments, we find that, below T co, there exists a large, anomalous Nernst signal e N,even(H,T) that is symmetric in field H, and remains finite as H→0. The time-reversal violating signal suggests that, below T co, vortices of one sign are spontaneously created to relieve interlayer phase frustration.

Original languageEnglish (US)
Article number277001
JournalPhysical review letters
Volume107
Issue number27
DOIs
StatePublished - Dec 27 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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