Abstract
The change in the specific heat by the application of magnetic field up to 16 T for high temperature superconductor system for DyBa 2Cu 3O 7− x by Revaz et al. [23] 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 〈Δ C〉=( B a / T c ) t/(1− t) (αΘ( γ)/ λ 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 Δ 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 γ as 5.608, which is close to the experimental value 5.3±0.5 given in the paper of Revaz et al. for this system.
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