Magneto-optical signatures of a cascade of transitions in La$_2-x$Ba$_x$CuO$_4$

Details Magneto-optical signatures of a cascade of transitions in La$_2-x$Ba$_x$CuO$_4$ Magneto-optical signatures of a cascade of transitions in La$_2-x$Ba$_x$CuO$_4$

2012-03-13

arxiv.org/abs/1203.2977v2

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

Recent experiments in the original cuprate high temperature superconductor, La$_2-x$Ba$_x$CuO$_4$, have revealed a remarkable sequence of transitions [1]. Here we investigate such crystals with Kerr effect which is sensitive to time-reversal-symmetry breaking (TRSB). Concurrent birefringence measurements accurately locate the structural phase transitions from high-temperature tetragonal to low temperature orthorhombic, and then to lower temperature tetragonal, at which temperature a strong Kerr signal onsets. Hysteretic behavior of the Kerr signal suggests that TRSB occurs well above room temperature, an effect that was previously observed in high quality YBa$_2$Cu$_3$O$_{6+x} crystals [2].

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