Phase Fluctuations in Strongly Coupled d-Wave Superconductors

Journal Article · Sat Jan 01 00:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.217001· OSTI ID:1003083

Mayr, Matthias ^[1]; Alvarez, Gonzalo ^[2]; Sen, Cengiz ^[3]; Dagotto, Elbio R ^[2]

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1. Max-Planck-Institut fur Feskorperforschung, Stuttgart, Germany
2. ORNL
3. Florida State University

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{sup *} and T{sub c}, associated with short- and long-range ordering, respectively, can be identified in a mean-field-motivated Hamiltonian. T{sup *} 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003083
• Journal Information: Physical Review Letters, Vol. 94, Issue 21; ISSN 0031--9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
COUPLING
COUPLINGS
D WAVES
DEGREES OF FREEDOM
ENERGY GAP
EXACT SOLUTIONS
EXCITATION
FLUCTUATIONS
HAMILTONIANS
HIGH-TC SUPERCONDUCTORS
MONTE CARLO METHOD
NUMERICAL SOLUTION
RANGE
STRONG INTERACTIONS
SUPERCONDUCTORS
TEMPERATURE RANGE 0400-1000 K