The cubic-tetragonal phase transition in strontium titanate: excess specific heat measurements and evidence for a near-tricritical, mean field type transition mechanism
作者： E K H Salje , M C Gallardo , J Jiménez , F J Romero , J del Cerro
DOI: 10.1088/0953-8984/10/25/006
关键词: Tricritical point 、 Landau theory 、 Condensed matter physics 、 Strontium titanate 、 Thermodynamics 、 Gibbs free energy 、 Tetragonal crystal system 、 Mean field theory 、 Phase transition 、 Exponent 、 Chemistry
摘要: The transition between the cubic and tetragonal phase in shows an excess specific heat of . Comparison temperature evolution entropy structural order parameter Q within experimental errors apparent exponent was confirmed analysed using a Landau-type expression for Gibbs free energy with A = 0.70 J , B 31.22 C 42.17 K K. closeness to tricritical point is seen by < C; all thermodynamic data 85 could be described selfconsistently this approach although small deviations cannot excluded interval less than 1 around tail at
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