On the Order Parameter of the Continuous Phase Transition in the Classical and Quantum Mechanical Limits

Autor(es)

dos Santos, C. A. M. ^[1] ; Oliveira, F. S. ^[1] ; da Luz, M. S. ^[2] ; Neumeier, J. J. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Engn Lorena, BR-12602810 Lorena, SP - Brazil

^[2] Univ Fed Triangulo Mineiro, Inst Ciencias Tecnol & Exatas, BR-38025180 Uberaba, MG - Brazil

^[3] Montana State Univ, Phys Dept, Bozeman, MT 59717 - USA

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Physics; v. 51, n. 6 JUL 2021.
• Citações Web of Science: 0

Resumo

The mean-field theory is revisited in the classical and quantum mechanical limits. Taking into account the boundary conditions at the phase transition and the third law of the thermodynamics, the physical properties of the ordered and disordered phases are reported. The equation for the order parameter predicts the occurrence of a saturation of Psi(2) similar to 1 near Theta(S), and the temperature below the quantum mechanical ground state is reached. The theoretical predictions are also compared with high- resolution thermal expansion data of SrTiO3 single crystals and other some previous results. An excellent agreement has been found suggesting a universal behavior of the theoretical model to describe continuous structural phase transitions. (AU)

• Processo FAPESP: 09/54001-2 - EMU: aquisição de equipamento cryo-free para caracterização de propriedades magnéticas por magnetometria de amostra vibrante (VSM)
• Beneficiário: Carlos Alberto Moreira dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 19/12798-3 - A estrutura cristalina do nióbio e a anisotropia de suas propriedades supercondutoras
• Beneficiário: Carlos Alberto Moreira dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional