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Title: 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 quasi-two-dimensional to three-dimensional xy-behavior, which belongs to the universality class of an uncharged superfluid. Because phase fluctuations destroy long-range order in strictly two-dimensional 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 xy-critical 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 mean-field treatments. Guided by the strong pairing fluctuations they explore the compatibility of Bose-Einstein condensation of hard-core Bosons on a latticemore » with the empirical trends in various properties of cuprate superconductors. The dependencies of zero-temperature London penetration depth, hole concentration, isotope and pressure coefficients turn out to be in remarkable agreement with the corresponding empirical trends.« less

Authors:
 [1]
  1. Zurich Research Lab., Rueschlikon (Switzerland). IBM Research Div.
Publication Date:
OSTI Identifier:
82820
Report Number(s):
CONF-940142-
ISBN 0-8194-1452-2; TRN: IM9533%%278
Resource Type:
Conference
Resource Relation:
Conference: OE/LASE `94: conference on optics, electro-optics, and laser applications in science and engineering, Los Angeles, CA (United States), 22-29 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; HIGH-TC SUPERCONDUCTORS; SUPERCONDUCTIVITY; TYPE-II SUPERCONDUCTORS; TRANSITION TEMPERATURE; MEISSNER-OCHSENFELD EFFECT; ORDER PARAMETERS; BOSE-EINSTEIN CONDENSATION; SPECIFIC HEAT; PENETRATION DEPTH; GINZBURG-LANDAU 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 quasi-two-dimensional to three-dimensional xy-behavior, which belongs to the universality class of an uncharged superfluid. Because phase fluctuations destroy long-range order in strictly two-dimensional 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 xy-critical 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 mean-field treatments. Guided by the strong pairing fluctuations they explore the compatibility of Bose-Einstein condensation of hard-core Bosons on a lattice with the empirical trends in various properties of cuprate superconductors. The dependencies of zero-temperature 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}
}

Conference:
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