Upper critical field in : Magnetotransport vs. magnetotunneling

P. Samuely; P. Szabó; T. Klein; A. G. M. Jansen; J. Marcus; C. Escribe-Filippini; P. Wyder

doi:10.1209/epl/i1998-00132-1

All issues

Volume 41 / No 2 (January II 1998)

Europhys. Lett., 41 2 (1998) 207-212

Abstract

Issue		Europhys. Lett. Volume 41, Number 2, January II 1998


Page(s)		207 - 212
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1998-00132-1
Published online		01 September 2002

Europhys. Lett., 41 (2), pp. 207-212 (1998)

Upper critical field in $\mathrm{Ba}_{1-x}\textrm{K}_x\textrm{BiO}_3$ : Magnetotransport vs. magnetotunneling

P. Samuely¹, P. Szabó¹^,2, T. Klein³, A. G. M. Jansen², J. Marcus³, C. Escribe-Filippini³ and P. Wyder²

¹ Institute of Experimental Physics, Slovak Academy of Sciences, SK-04353 Košice, Slovakia
² Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, B.P. 166, F-38042 Grenoble Cedex 9, France
³ Laboratoire d'Etudes des Propriétés Electroniques des Solides, Centre National de la Recherche Scientifique, B.P. 166, F-38042 Grenoble Cedex 9, France

Received: 4 July 1997
Accepted: 27 November 1997

Abstract

Elastic tunneling is used as a powerful direct tool to determine the upper critical field $H_{\rm c2}(T)$ in the high-T_c oxide ${\rm Ba}_{1-x}{\rm K}_x{\rm BiO}_3$ . The temperature dependence of H_c2 inferred from the tunneling follows the Werthamer-Helfand-Hohenberg prediction for type-II superconductors. A comparison will be made with resistively determined critical-field data.

PACS: 74.60.Ec – Mixed state, critical fields, and surface sheath / 74.25.Dw – Superconductivity phase diagrams / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects

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