Pattanaik, A and Kalta, B and Nayak, P and Nanda, KK (2010) Study of magnetic field effect on the specific heat and entropy in DyBa2Cu3O7-x. In: Physica B: Condensed Matter, 405 (16). pp. 3234-3238.
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The change in the specific heat by the application of magnetic field up to 161 for high temperature superconductor system for DyBa2Cu3O7-x by Revaz et al.  is examined through the phenomenological Ginzburg-Landau(G-L) theory of anisotropic Type-II superconductors. The observed specific heat anomaly near T-c with magnetic field is explained qualitatively through the expression <Delta C > = (B-a/T-c) t/(1 - t)(alpha Theta(gamma)lambda(2)(m)(0)), which is the anisotropic formulation of the G-L theory in the London limit developed by Kogan and coworkers; relating to the change in specific heat Delta C for the variation of applied magnetic field for different orientations with c-axis. The analysis of this equation explains satisfactorily the specific heat anomaly near T-c and determines the anisotropic ratio gamma as 5.608, which is close to the experimental value 5.3 +/- 0.5given in the paper of Revaz et al. for this system. (C) 2010 Elsevier B.V. All rights reserved.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||High-T-c superconductors;Thermodynamic properties; Phenomenological theory|
|Department/Centre:||Division of Chemical Sciences > Materials Research Centre|
|Date Deposited:||23 Aug 2010 10:49|
|Last Modified:||19 Sep 2010 06:14|
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