Columnar defects and vortex fluctuations in layered superconductors

A. E. Koshelev; P. Le Doussal; V. M. Vinokur

doi:10.1103/PhysRevB.53.R8855

← Back to search

Columnar defects and vortex fluctuations in layered superconductors

A. E. Koshelev, P. Le Doussal, V. M. Vinokur

DOI 10.1103/PhysRevB.53.R8855 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We investigate fluctuations of Josephson-coupled pancake vortices in layered superconductors in the presence of columnar defects. We study the thermodynamics of a single pancake stack pinned by columnar defects and obtain the temperature dependence of localization length, pinning energy, and critical current. We study the creep regime and compute the crossover current between linelike and pancakelike creep motion. We find that columnar defects effectively increase interlayer Josephson coupling by suppressing thermal fluctuations of pancakes. This leads to an upward shift in the decoupling line most pronounced around the matching field.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown