One-particle spectral function and local density of states in a phenomenological mixed-phase model for high-temperature superconductors

Matthias Mayr, Gonzalo Alvarez, Adriana Moreo, and Elbio Dagotto
Phys. Rev. B 73, 014509 – Published 11 January 2006

Abstract

The dynamical properties of a recently introduced phenomenological model for high-temperature superconductors are investigated. In the clean limit, it was observed that none of the homogeneous or striped states that are induced by the model at low temperatures can reproduce the recent angle-resolved photoemission results for La2xSrxCuO4 [Yoshida et al., Phys. Rev. Lett. 91, 027001 (2003)], which show a signal with two branches in the underdoped regime. On the other hand, upon including quenched disorder in the model and breaking the homogeneous state into “patches” that are locally either superconducting or antiferromagnetic, the two-branch spectra can be reproduced. In this picture, the nodal regions are caused by d-wave superconducting clusters. Studying the density of states (DOS), a pseudogap is observed, caused by the mixture of the gapped antiferromagnetic state and a d-wave superconductor. The local DOS can be interpreted using a mixed-phase picture, similar to what is observed in tunneling experiments. It is concluded that a simple phenomenological model for cuprates can capture several of the one-particle features observed in the underdoped regime of these materials.

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  • Received 18 March 2005

DOI:https://doi.org/10.1103/PhysRevB.73.014509

©2006 American Physical Society

Authors & Affiliations

Matthias Mayr1,*, Gonzalo Alvarez2, Adriana Moreo3,4, and Elbio Dagotto3,4

  • 1Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
  • 2Computer Science & Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA

  • *Present address: Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996 and Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831.

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Vol. 73, Iss. 1 — 1 January 2006

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