Abstract
The change in specific heat by the application of magnetic field ( B a ∼1 T) in the case of the high- T c superconductors is examined phenomenologically by the Ginzburg-Landau theory of anisotropic type-II superconductors. The observed large reduction of specific heat anomaly just below the superconducting transition is explained quantitatively. We have obtained the expression for the change in specific heat in a magnetic field ( ΔC) for any general orientation of B a with respect to the crystallographic c-axis. We also present the result for a polycrystalline sample. ΔC is shown to be linear in ( B a T c ) [ t (1 −t) ] for temperatures slightly below T c, where t= T T c . The slope of this linear behaviour is found to be related to the anisotropy of the effective mass.
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