Damping of the vortex motion in superconducting Mo3Si and YBa2Cu3O7-δ

S. G. Doettinger; R. P. Huebener; S. Kittelberger; C. C. Tsuei

doi:10.1209/epl/i1996-00392-7

All issues

Volume 33 / No 8 (March II 1996)

Europhys. Lett., 33 8 (1996) 641-646

Abstract

Issue		Europhys. Lett. Volume 33, Number 8, March II 1996


Page(s)		641 - 646
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1996-00392-7
Published online		01 September 2002

Europhys. Lett., 33 (8), pp. 641-646 (1996)

Damping of the vortex motion in superconducting Mo₃Si and YBa₂Cu₃O_7-δ

S. G. Doettinger¹, R. P. Huebener¹, S. Kittelberger¹ and C. C. Tsuei²

¹ Physikalisches Institut, Lehrstuhl Experimentalphysik II, Universität Tübingen, D-72076 Tübingen, Germany
² IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, N.Y., USA

Received: 16 November 1995
Accepted: 22 January 1996

Abstract

The damping of the vortex motion in the superconducting mixed state takes place by means of the power dissipation in the vortex core. In order to minimize the influence of flux pinning, we have performed flux flow experiments at high vortex velocities. We compare the temperature-dependent behaviour of the vortex core for a dirty low-T_c material with a high-T_c cuprate. The theoretical background was given by Larkin and Ovchinnikov, which extended the Bardeen-Stephen model taking into account nonequilibrium effects. For the low-T_c superconductor amorphous $\rm Mo_3Si$ , we find that the core resistivity $\tilde{\rho}$ is equal to the normal-state value $\rho_{\rm n}$ , and only weakly temperature dependent. In the cuprate $\rm YBa_2Cu_3O_{7-\delta}$ $\tilde{\rho}$ decreases with decreasing temperature. The moderately clean limit and possibly node lines in $\underline k$ -space of the order parameter appear to have a strong influence.

PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.80.Bj – Granular, melt-textured, and amorphous superconductors; powders

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