Pairing fluctuations in cuprate superconductors: Universal properties and trends
Abstract
The effects of thermal pairing fluctuations on the phase transition in extreme type 2 superconductors with pronounced uniaxial anisotropy are examined in zero magnetic field. Approaching {Tc} from below, there is the crossover from quasitwodimensional to threedimensional xybehavior, which belongs to the universality class of an uncharged superfluid. Because phase fluctuations destroy longrange order in strictly twodimensional systems the fluctuation dominated regime is rather large. Approaching from above, the same crossover occurs, but in this regime the fluctuations in the magnitude of the pairing field dominate. Using the Gaussian approximation the authors obtain the relevant correlation lengths and show the importance of fluctuations and anisotropy. Invoking the universal properties of the xycritical point the authors sketch various consequences of thermal fluctuations and review the experimental evidence of fluctuation effects. The primary focus is on the resulting universal properties in clean systems. The estimates for the correlation volumes and lengths of phase and amplitude fluctuations in the pair field are comparable to those in superfluid helium and clearly reveal the importance of fluctuations in cuprate superconductors and the inadequacy of meanfield treatments. Guided by the strong pairing fluctuations they explore the compatibility of BoseEinstein condensation of hardcore Bosons on a latticemore »
 Authors:

 Zurich Research Lab., Rueschlikon (Switzerland). IBM Research Div.
 Publication Date:
 OSTI Identifier:
 82820
 Report Number(s):
 CONF940142
ISBN 0819414522; TRN: IM9533%%278
 Resource Type:
 Conference
 Resource Relation:
 Conference: OE/LASE `94: conference on optics, electrooptics, and laser applications in science and engineering, Los Angeles, CA (United States), 2229 Jan 1994; Other Information: PBD: 1994; Related Information: Is Part Of Superconducting superlattices and multilayers. Proceedings SPIE Volume 2157; Bozovic, I. [ed.] [Varian Associates Inc., Palo Alto, CA (United States). E.H. Ginzton Research Center]; PB: 386 p.
 Country of Publication:
 United States
 Language:
 English
 Subject:
 36 MATERIALS SCIENCE; HIGHTC SUPERCONDUCTORS; SUPERCONDUCTIVITY; TYPEII SUPERCONDUCTORS; TRANSITION TEMPERATURE; MEISSNEROCHSENFELD EFFECT; ORDER PARAMETERS; BOSEEINSTEIN CONDENSATION; SPECIFIC HEAT; PENETRATION DEPTH; GINZBURGLANDAU THEORY; PHASE TRANSFORMATIONS; COPPER OXIDES
Citation Formats
Schneider, T. Pairing fluctuations in cuprate superconductors: Universal properties and trends. United States: N. p., 1994.
Web.
Schneider, T. Pairing fluctuations in cuprate superconductors: Universal properties and trends. United States.
Schneider, T. Sat .
"Pairing fluctuations in cuprate superconductors: Universal properties and trends". United States.
@article{osti_82820,
title = {Pairing fluctuations in cuprate superconductors: Universal properties and trends},
author = {Schneider, T},
abstractNote = {The effects of thermal pairing fluctuations on the phase transition in extreme type 2 superconductors with pronounced uniaxial anisotropy are examined in zero magnetic field. Approaching {Tc} from below, there is the crossover from quasitwodimensional to threedimensional xybehavior, which belongs to the universality class of an uncharged superfluid. Because phase fluctuations destroy longrange order in strictly twodimensional systems the fluctuation dominated regime is rather large. Approaching from above, the same crossover occurs, but in this regime the fluctuations in the magnitude of the pairing field dominate. Using the Gaussian approximation the authors obtain the relevant correlation lengths and show the importance of fluctuations and anisotropy. Invoking the universal properties of the xycritical point the authors sketch various consequences of thermal fluctuations and review the experimental evidence of fluctuation effects. The primary focus is on the resulting universal properties in clean systems. The estimates for the correlation volumes and lengths of phase and amplitude fluctuations in the pair field are comparable to those in superfluid helium and clearly reveal the importance of fluctuations in cuprate superconductors and the inadequacy of meanfield treatments. Guided by the strong pairing fluctuations they explore the compatibility of BoseEinstein condensation of hardcore Bosons on a lattice with the empirical trends in various properties of cuprate superconductors. The dependencies of zerotemperature London penetration depth, hole concentration, isotope and pressure coefficients turn out to be in remarkable agreement with the corresponding empirical trends.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {12}
}