Phase fluctuations in strongly coupled d-wave superconductors

Matthias Mayr, Gonzalo Alvarez, Cengiz Şen, Elbio Dagotto

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Abstract

We present a numerically exact solution for the BCS Hamiltonian at any temperature, including the degrees of freedom associated with classical phase, as well as amplitude fluctuations via a Monte Carlo integration. This allows for an investigation over the whole range of couplings: from weak attraction, as in the well-known BCS limit, to the mainly unexplored strong-coupling regime of pronounced phase fluctuations. In the latter, two characteristic temperatures T* and Tc, associated with short- and long-range ordering, respectively, can be identified in a mean-field-motivated Hamiltonian. T* at the same time corresponds to the opening of a gap in the excitation spectrum. In addition to introducing a novel procedure to study strongly coupled d-wave superconductors, our results indicate that classical phase fluctuations are not sufficient to explain the pseudogap features of high-temperature superconductors.

Original languageEnglish
Article number217001
JournalPhysical Review Letters
Volume94
Issue number21
DOIs
StatePublished - Jun 3 2005

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