Structural, electronic, and magnetic entropy contributions of the orbital order-disorder transition in LaMnO^sub 3

Measurements of X-ray diffraction, electrical resistivity, and magnetization are reported across the Jahn-Teller phase transition in LaMnO... Using a thermodynamic equation, we obtained the pressure derivative of the critical temperature (T...), dT.../dP = -28.3 K GPa... This approach also reveals t...

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Bibliographic Details
Published inPhase transitions Vol. 84; no. 3; p. 284
Main Authors Ramirez, F E N, Cunha, B B, Alves, W A, Jardim, R F, Muccillo, R, Souza, J A
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Ltd 01.03.2011
Subjects
Conductivity
Diffraction
Entropy
Magnetism
Measurement
Phase transitions
Pressure
Temperature
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Summary:Measurements of X-ray diffraction, electrical resistivity, and magnetization are reported across the Jahn-Teller phase transition in LaMnO... Using a thermodynamic equation, we obtained the pressure derivative of the critical temperature (T...), dT.../dP = -28.3 K GPa... This approach also reveals that 5.7(3)J (mol K)... comes from the volume change and 0.8(2) J (mol K)... from the magnetic exchange interaction change across the phase transition. Around TJT, a robust increase in the electrical conductivity takes place and the electronic entropy change, which is assumed to be negligible for the majority of electronic systems, was found to be 1.8(3) J (mol K)... (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0141-1594
1029-0338