X-ray Dichroism and the Pseudogap Phase of Cuprates

Details X-ray Dichroism and the Pseudogap Phase of Cuprates X-ray Dichroism and the Pseudogap Phase of Cuprates

2007-04-04

arxiv.org/abs/0704.0599v2

Phys Rev B 76, 014510 (2007)

Physics

Condensed Matter

Superconductivity

final version to be published in Phys Rev B: some calculational details added, clarification of XNLD contamination and biaxial

Scientific paper

10.1103/PhysRevB.76.014510

A recent polarized x-ray absorption experiment on the high temperature cuprate superconductor Bi2Sr2CaCu2O8 indicates the presence of broken parity symmetry below the temperature, T*, where a pseudogap appears in photoemission. We critically analyze the x-ray data, and conclude that a parity-breaking signal of the kind suggested is unlikely based on the crystal structures reported in the literature. Possible other origins of the observed dichroism signal are discussed. We propose x-ray scattering experiments that can be done in order to determine whether such alternative interpretations are valid or not.

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