Quantum depinning of vortices in type-II superconductors

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.13330· OSTI ID:389344

Blatter, G ^[1]; Ivlev, B ^[2]; Vinokur, V ^[3]

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1. Theoretische Physik, Eidgenoessische Technische Hochschule Zuerich--Hoenggerberg, CH-8093 Zuerich (Switzerland)
2. Theoretische Physik, Eidgenoessische Technische Hochschule Zuerich--Hoenggerberg, CH-8093 Zuerich, Switzerl
3. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We investigate the phenomenon of quantum depinning of vortices in high resistivity amorphous thin films and in high temperature superconductors for the situation of weak collective pinning. Fluctuations of the vortex system produce a smoothing of the pinning potential and thereby a strong renormalization of the critical current density {ital j}{sub {ital c}}({ital T}){proportional_to}(1+{l_angle}{ital u}{sup 2}{r_angle}/{xi}{sup 2}){sup {minus}{kappa}}, with large exponents {kappa}{sub 2D}=5/2 and {kappa}{sub 3D}=11/2 for the regimes where the collective pinning involves two- and three-dimensional bundles of vortices. We determine the mean squared displacement amplitude {l_angle}{ital u}{sup 2}{r_angle} within a quantum statistical ensemble for the cases of a dissipative vortex dynamics (amorphous material) and for a Hamiltonian dynamics dominated by the Hall force (oxide superconductors) and present results for the renormalized critical current density {ital j}{sub {ital c}}({ital T}). {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 389344
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AMORPHOUS STATE
COHERENCE LENGTH
CRITICAL CURRENT
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MIXED STATE
PENETRATION DEPTH
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
THIN FILMS
TYPE-II SUPERCONDUCTORS