title: Spontaneous symmetry breaking by charge stripes in the high pressure phase of superconducting La1.875Ba0.125CuO4.
abstract: In those cases where charge-stripe order has been observed in cuprates, the crystal structure is such that the average rotational symmetry of the CuO2 planes is reduced from fourfold to twofold. As a result, one could argue that the reduced lattice symmetry is essential to the existence of stripe order. We use pressure to restore the average fourfold symmetry in a single crystal of La1.875Ba0.125CuO4, and show by x-ray diffraction that charge-stripe order still occurs. Thus, electronically driven stripe order can spontaneously break the lattice symmetry.
authors.affiliation: Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: M
authors.initials: M
authors.lastname: Hücker
authors.forename: M V
authors.initials: MV
authors.lastname: Zimmermann
authors.forename: M
authors.initials: M
authors.lastname: Debessai
authors.forename: J S
authors.initials: JS
authors.lastname: Schilling
authors.forename: J M
authors.initials: JM
authors.lastname: Tranquada
authors.forename: G D
authors.initials: GD
authors.lastname: Gu