定常点熱源加熱・冷却法による二次元異方性物質の熱伝導率測定

概要

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We propose a new method of measuring the principal thermal conductivity of a two-dimensional anisotropic heat conductor using a steady heat source and sink. The theory of this new thermal conductivity measurement is based on congruent matrix transformation from nonuniform space of an anisotropic heat conductor to the uniform space of an isotropic one. When we introduce the hypothesis of symmetry in the heat conduction law, it leads to an equivalent relation of the thermal conductivity tensor between the anisotropic tensor Λ_μ and the uniform space tensor Λ_ν. This new measuring method can provide the two principal thermal conductivities λ_<1, 2> and the principal rotation angle φ from the temperature detecting axis. We have measured the temperature dependence of two principal thermal conductivities λ_<1, _2> and the principal rotation angle φ of Y_1Ba_2Cu_3O_<7-y>. Anomalies of the two principal thermal conductivities and the principal rotation angle are clearly observed at the superconductive transition temperature T_c.
1995-07-25