Specific heat of YBa2Cu3O7−<i>δ</i> ceramics: theoretical models and experiment
I. N. KudryavtsevA. M. Gorky State University, Kharkov 1К. Э. НемченкоA. M. Gorky State University, Kharkov 1V. V. DerevyankoPhysicotechnical Institute, Ministry of Atomic Power Industry, Kharkov 2V. A. FinkelPhysicotechnical Institute, Ministry of Atomic Power Industry, Kharkov 2M. G. ZemlyanovI. V. Kurchatov Atomic Energy Institute, Moscow 3P. P. ParshinI. V. Kurchatov Atomic Energy Institute, Moscow 3
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The results of measurements of the temperature dependence of molar specific heat of YBa2Cu3O7−δ (δ ≃ 0.05, 1) in the temperature range 5—250 K are presented. Different theoretical approaches used in literature for decribing the lattice specific heat of high-Tc superconductors are analyzed. A model including optical phonon modes in addition to acoustic modes is proposed for determining various parameters of the phonon system of YBa2Cu3O7−δ ceramics. A comparative analysis of the superconducting and nonsuperconducting states of the samples is carried out.
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