Effect of disorder on the exponent in the coherence region in high temperature superconductors

Kaur, Manmeet and Srinivasan, R and Mehta, GK and Kanjilal, D and Pinto, R and Ogale, SB and Mohan, S and Ganesan, V (2006) Effect of disorder on the exponent in the coherence region in high temperature superconductors. In: Physica C: Superconductivity, 443 (1-2). 61 -68.

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Abstract

Effect of disorder on the electrical resistance near the superconducting transition temperature in the paracoherence region of high temperature YBa2CU3O7-delta (YBCO) thin film superconductor is reported. For this, c-axis oriented YBa2Cu3O7-delta thin films having superconducting transition width varying between 0.27 K and 6 K were deposited using laser ablation and high pressure oxygen sputtering techniques. Disorder in these films was further created by using 100 MeV oxygen and 200 MeV silver ions with varying fluences. It is observed that the critical exponent in the paracoherence region for films with high transition temperature and small transition width is in agreement with the theoretically predicted value (gamma = 1.33) and is not affected by disorder, while for films with lower transition temperature and larger transition width the value of exponent is much larger as compared to that theoretically predicted and it varies from sample to sample and usually changes with disorder induced by radiation. This difference in the behaviour of the exponent has been explained on the basis of differences in the strength of weak links and the transition between temperatures T. and T, is interpreted as a percolation like transition with disorder. (c) 2006 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Physica C: Superconductivity
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Paracoherence excess conductivity; Heavy ion irradiation; High Tc superconductor; Transport property
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	13 Jul 2010 05:10
Last Modified:	26 Oct 2018 14:44
URI:	http://eprints.iisc.ac.in/id/eprint/28884

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