Unscreened universality class for superconductors with columnar disorder
2003 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 67, no 9Article in journal (Refereed) Published
The phase transition in a model for vortex lines in high temperature superconductors with columnar defects, i.e., linearly correlated quenched random disorder, is studied with finite size scaling and Monte Carlo simulations. Previous studies of critical properties have mainly focused on the limit of strongly screened vortex line interactions. Here the opposite limit of weak screening is considered. The simulation results provide evidence for a distinct universality class, with values of the critical exponents that differ from the case of strong screening of the vortex interaction. In particular, scaling is anisotropic and characterized by a nontrivial value of the anisotropy exponent zeta=nu(parallel to)/nu(perpendicular to). The exponents we find, zeta=1.25+/-0.1, nu(perpendicular to)=1.0+/-0.1, z=1.95+/-0.1, are similar to certain experimental results for YBa2Cu3O7.
Place, publisher, year, edition, pages
2003. Vol. 67, no 9
high-temperature superconductors, bose-glass-transition, yba2cu3o7 single-crystals, insulator transition, correlated disorder, critical-points, vortex arrays, defects, phase, localization
IdentifiersURN: urn:nbn:se:kth:diva-22388DOI: 10.1103/PhysRevB.67.092501ISI: 000182019300020OAI: oai:DiVA.org:kth-22388DiVA: diva2:341086
QC 201005252010-08-102010-08-10Bibliographically approved