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Evidence of chiral order in the charge-ordered phase of superconducting La1.875Ba0.125Cuo4 single crystals using polar Kerr-effect measurements.

Authors
  • Karapetyan, Hovnatan
  • Xia, Jing
  • Hücker, M
  • Gu, G D
  • Tranquada, J M
  • Fejer, M M
  • Kapitulnik, A
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Jan 31, 2014
Volume
112
Issue
4
Pages
47003–47003
Identifiers
PMID: 24580482
Source
Medline
License
Unknown

Abstract

High resolution polar Kerr effect measurements were performed on La1.875Ba0.125CuO4 single crystals revealing that a finite Kerr signal is measured below an onset temperature TK that coincides with the charge ordering transition temperature TCO. We further show that the sign of the Kerr signal cannot be trained with the magnetic field, is found to be the same on opposite sides of the same crystal, and is odd with respect to strain in the diagonal direction of the unit cell. These observations are consistent with a chiral "gyrotropic" order above Tc for La1.875Ba0.125CuO4; similarities to other cuprates suggest that it is a universal property in the pseudogap regime.

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