TY - JOUR
T1 - Phase fluctuations in strongly coupled d-wave superconductors
AU - Mayr, Matthias
AU - Alvarez, Gonzalo
AU - Şen, Cengiz
AU - Dagotto, Elbio
PY - 2005/6/3
Y1 - 2005/6/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=27744486310&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.94.217001
DO - 10.1103/PhysRevLett.94.217001
M3 - Article
AN - SCOPUS:27744486310
SN - 0031-9007
VL - 94
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 217001
ER -