Rao , A. and Radheshyam, S. and Das, A. and Gahtori, B. and Agarwal, S. K. and Lin, Y. F. and Sivakumar, K. M. and Kuo, Y. K. (2006) Effect of Mn doping on the specific heat of the high T-C superconductor REBa2Cu3Oy (RE = Y, Gd). Journal of Physics: Condensed Matter, 18 (11). pp. 2955-2962. ISSN 0953-8984

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We present measurements of specific heat in Mn-doped compounds REBa2(Cu1-xMnx)(3)O-y (RE = Y and Gd) with 0 <= x <= 2%. It is found that the transition temperature of Mn-doped YBa2(Cu1-xMnx)(3)O-y (YBaCuMnO) compounds does not change appreciably. On the other hand, in the case of GdBa2(Cu1-xMnx)(3)O-y (GdBaCuMnO) samples, the transition temperature decreases noticeably with the increase in Mn concentration. In REBaCuMnO, a jump in specific heat at the superconducting transition was observed for a low concentration of Mn; however, only a small change in slope was noticed for Mn concentrations above 1%. Replacing 0.5% Cu by Mn has only a marginal effect on the transition temperature, but a three-fold Suppression of the specific heat jump is observed with such a Substitution. This finding clearly demonstrates that these constituents are being incorporated into the superconductors as a whole and Hot in the form of a local cluster.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s IOP Publishing.
Subjects: Physics
Depositing User: Users 27 not found.
Date Deposited: 09 May 2018 08:59
Last Modified: 09 May 2018 08:59
URI: http://npl.csircentral.net/id/eprint/2461

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