Multiple Broken Symmetries in Striped La$_{2-x}$Ba$_{x}$CuO$_{4}$ detected by the Field Symmetric Nernst Effect

Anjan Soumyanarayanan; X. Y. Tee; T. Ito; T. Ushiyama; Y. Tomioka; C. Panagopoulos

doi:10.1103/PhysRevB.93.054512

paper

Multiple Broken Symmetries in Striped La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ detected by the Field Symmetric Nernst Effect

arXiv:1506.01994 · doi:10.1103/PhysRevB.93.054512

Abstract

We report on a thermoelectric investigation of the stripe and superconducting phases of the cuprate La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ near the $x = 1/8$ doping known to host stable stripes. We use the doping and magnetic field dependence of field-symmetric Nernst effect features to delineate the phenomenology of these phases. Our measurements are consistent with prior reports of time-reversal symmetry breaking signatures above the superconducting $T_{c}$ , and crucially detect a sharp, robust, field-invariant peak at the stripe charge order temperature, $T_{CO}$ . Our observations suggest the onset of a nontrivial charge ordered phase at $T_{CO}$ , and the subsequent presence of spontaneously generated vortices over a broad temperature range before the emergence of bulk superconductivity in LBCO.

Multiple Broken Symmetries in Striped La2−x​Bax​CuO4​ detected by the Field Symmetric Nernst Effect

Abstract

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Multiple Broken Symmetries in Striped La $_{2 - x}$ Ba $_{x}$ CuO $_{4}$ detected by the Field Symmetric Nernst Effect