Non-phonon contribution to the specific heat of PbMg1/3Nb2/3O3 at low temperatures

摘要

Measurements of specific heat of relaxor ferroelectric PbMg1/3Nb2/3O3 (PMN) in the temperature range from 2 to 300 K by adiabatic calorimetry and relaxation technique are reported. Comparison of different approaches to description of the temperature dependence of specific heat has shown that experimental data can be adequately described in terms of fractal formalism, Spectral dimension inferred from low temperature specific heat measurements was found to be in good agreement with spectral dimension estimated from inelastic neutron scattering data. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 16]