Abstract
Using a two-dimensional model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), we study the influence of chemical pressure (∇μ) on nonlinear (i.e., ∇T dependent) thermal conductivity (NLTC) of an intrinsically granular superconductor. Quite a substantial enhancement of NLTC is predicted when intrinsic chemoelectric field Eμ∝∇μ closely matches the externally produced thermoelectric field ET∝∇T. The estimates of the model parameters suggest a realistic possibility to experimentally monitor this effect in nonstoichiometric high-TC superconductors.
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