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Title: X-ray dichroism and the pseudogap phase of cuprates.

Abstract

A recent polarized x-ray absorption experiment on the high-temperature cuprate superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} 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.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
915000
Report Number(s):
ANL/MSD/JA-59021
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US200817%%199
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B; Journal Volume: 76; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CRYSTAL STRUCTURE; CUPRATES; DICHROISM; PARITY; PHOTOEMISSION; SCATTERING; SUPERCONDUCTORS; SYMMETRY

Citation Formats

Di Matteo, S., Norman, M. R., Materials Science Division, and Lab. Nazionali di Frascati INFN. X-ray dichroism and the pseudogap phase of cuprates.. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.76.014510.
Di Matteo, S., Norman, M. R., Materials Science Division, & Lab. Nazionali di Frascati INFN. X-ray dichroism and the pseudogap phase of cuprates.. United States. doi:10.1103/PhysRevB.76.014510.
Di Matteo, S., Norman, M. R., Materials Science Division, and Lab. Nazionali di Frascati INFN. Mon . "X-ray dichroism and the pseudogap phase of cuprates.". United States. doi:10.1103/PhysRevB.76.014510.
@article{osti_915000,
title = {X-ray dichroism and the pseudogap phase of cuprates.},
author = {Di Matteo, S. and Norman, M. R. and Materials Science Division and Lab. Nazionali di Frascati INFN},
abstractNote = {A recent polarized x-ray absorption experiment on the high-temperature cuprate superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} 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.},
doi = {10.1103/PhysRevB.76.014510},
journal = {Phys. Rev. B},
number = 2007,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Cited by 3
  • Angle-resolved photoemission on underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} reveals that in the pseudogap phase, the dispersion has two branches located above and below the Fermi level with a minimum at the Fermi momentum. This is characteristic of the Bogoliubov dispersion in the superconducting state. We also observe that the superconducting and pseudogaps have the same d-wave form with the same amplitude. Our observations provide direct evidence for preformed Cooper pairs, implying that the pseudogap phase is a precursor to superconductivity.
  • We derive the fermionic contribution to the longitudinal and Hall conductivities within a Kubo formalism, using a phenomenological Greens function which has been previously developed to describe photoemission data in the pseudogap phase of the cuprates. We find that the in-plane electrical and thermal conductivities are metallic-like, showing a universal limit behavior characteristic of a d-wave spectrum as the scattering rate goes to zero. In contrast, the c-axis resistivity and the Hall number are insulating-like, being divergent in the same limit. The relation of these results to transport data in the pseudogap phase is discussed.
  • The observation of a large Nernst signal in cuprates above the superconducting transition temperature has attracted much attention. A potential explanation is that it originates from superconducting fluctuations. Although the Nernst signal is indeed consistent with Gaussian fluctuations for overdoped cuprates, Gaussian theory fails to describe the temperature dependence seen for underdoped cuprates. Here, we consider the vertex correction to Gaussian theory resulting from the pseudogap. This yields a Nernst signal in good agreement with the data.