Low Temperature Physics: 32, 290 (2006); https://doi.org/10.1063/1.2199428 (8 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 4-5 (April 2006), p. 391-400    ( to contents , go back )

Complexity in high-temperature superconductors

G. Alvarez1, A. Moreo2, and E. Dagotto2

1Computer Science & Mathematics Division, Oak Ridge National Laboratory Oak Ridge, Tennessee 37831, USA
E-mail: alvarezcampg@ornl.gov

2Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 and Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
pos Анотація:

Received August 25, 2005

Abstract

A spin-fermion and Landau–Ginzburg model for high-temperature superconductors are formulated and analyzed with unbiased numerical techniques. The study of the competition between d-wave superconductivity and antiferromagnetism in the clean limit suggests that the phase diagram is not universal. When chemical disorder is considered, a «clustered state» with short range order but without long range order appears leading to the possibility of a giant proximity effect. The influence of disorder on the spectral function is also addressed and results are compared to available angle resolved photoemission data for cuprates.

PACS:
74.20.De - Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
74.20.Rp - Pairing symmetries (other than s-wave)

Key words: high-Tc superconductivity, clustered states, pseudo-gap, giant effects.

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