Josephson coupling between superconducting clusters in crystals

O. F. de Lima; V. P. S. Awana; R. A. Ribeiro; M. A. Avila

doi:10.1209/epl/i2000-00528-3

All issues

Volume 51 / No 2 (July 2000)

Europhys. Lett., 51 2 (2000) 174-180

Abstract

Issue		Europhys. Lett. Volume 51, Number 2, July 2000


Page(s)		174 - 180
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2000-00528-3
Published online		01 September 2002

Europhys. Lett., 51 (2), pp. 174-180 (2000)

Josephson coupling between superconducting clusters in $\ab{Bi_{2}Sr_{2}CaCu _{2}O_{8+\delta}}$ crystals

O. F. de Lima, V. P. S. Awana, R. A. Ribeiro and M. A. Avila

Instituto de Física “Gleb Wataghin”, UNICAMP - 13083-970, Campinas, SP, Brazil

Received: 14 December 1999
Accepted: 19 May 2000

Abstract

Diamagnetic moments for two Bi₂Sr₂CaCu₂O $_{8+\delta }$ crystals were measured at different fields H and temperatures. For the higher fields two distinct transition temperatures $T_{\ab g}$ and $T_{\ab J}$ are seen, with $T_{\ab g}>T_{\ab J}$ . By increasing H the line $T_{\ab g}(H)$ shifts very slowly while $T_{\ab J}(H)$ shifts much faster to lower temperatures, displaying a clear upward curvature well described by a theory based on Josephson coupling between superconducting clusters. We show further that $T_{\ab J}(H)$ is dependent on sample homogeneity, which is correlated with oxygen distribution in the high- $T_{\ab c}$ superconductors.

PACS: 74.20.-z – Theories and models of superconducting state / 74.25.Ha – Magnetic properties / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects

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