Critical current-voltage scaling of heavy-ion–irradiated and superconductors

A. Ruyter; V. Hardy; N. H. Hong; L. Ammor

doi:10.1209/epl/i2004-10236-0

All issues

Volume 68 / No 4 (November 2004)

Europhys. Lett., 68 4 (2004) 571-576

Abstract

Issue		Europhys. Lett. Volume 68, Number 4, November 2004


Page(s)		571 - 576
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2004-10236-0
Published online		27 October 2004

Europhys. Lett., 68 (4), pp. 571-576 (2004)

Critical current-voltage scaling of heavy-ion–irradiated $\chem{Bi_2Sr_2CaCu_2O_{8+\delta}}$ and $\chem{(K,Ba)BiO_3}$ superconductors

A. Ruyter¹, V. Hardy², N. H. Hong¹ and L. Ammor¹

¹ Laboratoire LEMA, UMR 6157 CNRS-CEA, Université F. Rabelais Parc de Grandmont, 37200 Tours, France
² Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN 6 Bd du Maréchal Juin, 14050 Caen, France

Corresponding author: ruyter@univ-tours.fr

Received: 3 June 2004
Accepted: 21 September 2004

Abstract

Current-voltage characteristics were investigated in highly anisotropic $\chem{Bi_2Sr_2CaCu_2O_{8+\delta}}$ , $\chem{Bi_{1.8}Pb_{0.2}Sr_2CaCu_2O_{8+\delta}}$ and isotropic $\chem{(K,Ba)BiO_3}$ single crystals which were irradiated in the direction parallel to the c-axis. In the range of magnetic fields from $B_{\phi}/10$ to $B_{\phi}$ (where $B_{\phi}$ is the matching field), same scaling functions can be used to describe the transition in those two systems. The field- and sample-independent critical exponents, which were found to be $\nu_{\bot}=1.1\pm 0.1$ , $z=5.3\pm 0.2$ using $\alpha(\equiv\nu_{\parallel}/\nu_{\bot})=2$ , are in a very good agreement with numerical simulations for strongly screened vortex line interactions. Moreover, the obtained scalings are the same despite a large difference in anisotropy.

PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.25.Qt – Vortex lattices, flux pinning, flux creep / 74.72.Hs – Bi-based cuprates

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