Langevin vortex dynamics for a layered superconductor in the lowest-Landau-level approximation

W. A. Al-Saidi; D. Stroud

doi:10.1103/PhysRevB.68.144511

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Langevin vortex dynamics for a layered superconductor in the lowest-Landau-level approximation

W. A. Al-Saidi, D. Stroud

DOI 10.1103/PhysRevB.68.144511 · Physical Review B

T1

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Abstract

We have numerically investigated the dynamics of vortices in a clean layered superconductor placed in a perpendicular magnetic field. We describe the energetics using a Ginzburg-Landau free-energy functional in the lowest-Landau-level approximation. The dynamics are determined using the time-dependent Ginzburg-Landau approximation, and thermal fluctuations are incorporated via a Langevin term. The c-axis conductivity at nonzero frequencies, as calculated from the Kubo formalism, shows a strong but not divergent increase as the melting temperature TM is approached from above, followed by an apparently discontinuous drop at the vortex-lattice freezing temperature. The discontinuity is consistent with the occurrence of a first-order freezing. The calculated equilibrium properties agree with previous Monte Carlo studies using the same Hamiltonian. We briefly discuss the possibility of detecting this fluctuation conductivity experimentally.

Source-reported materials — not catalogue approval

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