Unusual Nernst effect suggestive of time-reversal violation in the striped cuprate La$_{2-x}$Ba$_x$CuO$_4$

Details Unusual Nernst effect suggestive of time-reversal violation in the striped cuprate La$_{2-x}$Ba$_x$CuO$_4$ Unusual Nernst effect suggestive of time-reversal violation in the striped cuprate La$_{2-x}$Ba$_x$CuO$_4$

2011-10-10

arxiv.org/abs/1110.2137v1

Phys. Rev. Lett. 107, 277001 (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.277001

The striped cuprate La$_{2-x}$Ba$_x$CuO$_4$ ($x=\frac18)$ undergoes several transitions below the charge-ordering temperature $T_{co}$ = 54 K. 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 $H\to 0$. The time-reversal violating signal suggests that, below $T_{co}$, vortices of one sign are spontaneously created to relieve interlayer phase frustration.

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