Anomalous Behaviour of the Specific Heat of AB′B″O₃ Complex Perovskites at Low Temperatures

S. GVASALIYA Laboratory for Neutron Scattering ETHZ & Paul-Scherrer Institut CH-5232 Villigen PSI, Switzerland and Ioffe Physical Technical Institute, 26, Politechnicheskaya, Russia, 194021

S. LUSHNIKOV Ioffe Physical Technical Institute, 26 Politechnicheskaya, St. Petersburg, Russia, 194021

Y. MORIYA Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Japan, 226-8503

H. KAWAJI Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Japan, 226-8503

T. ATAKE Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Japan, 226-8503

M. SMIRNOV Fock Institute of Physics Saint-Petersburg University, 194508 Petrodvoretz, St. Petersburg, Russia

V. KAZIMIROV University of Virginia Department of Physics, Charlottesville, VA, 22903, USA

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Abstract

Specific heat of PbMg_1/3Nb_2/3O₃, PbMg_1/3Ta_2/3O₃, and BaMg_1/3Ta_2/3O₃ complex perovskites has been measured from 2 K up to 295 K. At low temperatures a drastic difference of the behaviour of the specific heat of BaMg_1/3 Ta_2/3O₃ with respect to other two compounds was found. Different approaches to describe the specific heat at the low temperatures of the PbMg_1/3Nb_2/3O₃ relaxor ferroelectric are discussed.

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Acknowledgement

Work was partially supported by RFBR grant 02–02–17678.

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Anomalous Behaviour of the Specific Heat of AB′B″O₃ Complex Perovskites at Low Temperatures

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Anomalous Behaviour of the Specific Heat of AB′B″O3 Complex Perovskites at Low Temperatures

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Anomalous Behaviour of the Specific Heat of AB′B″O₃ Complex Perovskites at Low Temperatures