Quantum depinning of vortices in type-II superconductors

Gianni Blatter; Boris Ivlev; Valerii Vinokur

doi:10.1103/PhysRevB.54.13330

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Quantum depinning of vortices in type-II superconductors

Gianni Blatter, Boris Ivlev, Valerii Vinokur

DOI 10.1103/PhysRevB.54.13330 · Physical Review B

T1

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Abstract

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 jc(T)∝(1+〈u2〉/ξ2)−κ, with large exponents κ2D=5/2 and κ3D=11/2 for the regimes where the collective pinning involves two- and three-dimensional bundles of vortices. We determine the mean squared displacement amplitude 〈u2〉 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 jc(T). © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown