Structures of Metastable States in Phase Transitions with a High-Spin Low-Spin Degree of Freedom(Condensed Matter and Statistical Physics)

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概要

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• The difference in the degeneracy of low-spin (LS) and high-spin (HS) states causes interesting entropy effects on spin-crossover phase transitions and charge transfer phase transitions in materials composed of spin-crossover atoms. Mechanisms of the spin-crossover (SC) phase transitions have been studied using the Wajnflasz model, where the degeneracy of the spin states (HS or LS) is taken into account, and the cooperative nature of the spin-crossover phase transitions has been well described. Recently, a charge transfer (CT) phase transition due to electron hopping between LS and HS sites has been studied using a generalized Wajnflasz model. Systems with SC and CT both have a high temperature structure (HT) and a low temperature structure (LT), and the transition between them can be a smooth crossover or a discontinuous first-order phase transition, depending on the parameter values of the systems. Although, apparently, the standard SC system and the CT system are very different, it has been shown that the two models are equivalent under a certain transformation of variables. In both systems, the structure of the metastable state at low temperatures is a matter of interest. We study the temperature dependence of the fraction of HT systematically in a unified model and find several structures of equilibrium and metastable states of the model as functions of the system parameters. In particular, we find a reentrant-type metastable branch of HT in a low temperature region, which sould play an important role in the study of the photo-irradiated processes of related materials.

• 理論物理学刊行会の論文
• 2005-10-25

著者

• MIYASHITA Seiji

  Department of Applied Physics, Graduate School of Engineering, The University of Tokyo

• TOKORO Hiroko

  Department of Chemistry, University of Tokyo

• Miyashita S

  Univ. Tokyo Tokyo Jpn

• KONISHI Yusuke

  Department of Physics, The University of Tokyo

• NISHINO Masamichi

  Computational Materials Science Center, National Institute for Materials Science

• BOUKHEDDADEN Kamel

  Laboratoire de Magnetisme et d'Optique, Universite de Versailles

• VARRET Francois

  Laboratoire de Magnetisme et d'Optique, Universite de Versailles

• Tokoro Hiroko

  Department Of Chemistry School Of Science The University Of Tokyo

• Tokoro Hiroko

  Department Of Physics The University Of Tokyo:jsps

• Konishi Yusuke

  Department Of Physics The University Of Tokyo

• Varret Francois

  Laboratoire De Magnetisme Et D'optique Universite De Versailles

• Miyashita Seiji

  Department Of Physics University Of Tokyo

• Miyashita Seiji

  Department Of Physics School Of Science The University Of Tokyo

• Konishi Yusuke

  Department Of Mechanical Sciences And Engineering Tokyo Institute Of Technology

• Miyashita Seiji

  Graduate School Of Human And Environmental Studies Kyoto University

• Nishino Masamichi

  Computational Materials Science Center National Institute For Materials Science:crest Jst

• Boukheddaden Kamel

  Laboratoire De Magnetisme Et D'optique Universite De Versailles

• Miyashita Seiji

  Department Of Applied Physics University Of Tokyo

• Miyashita Seiji

  Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo

• Miyashita Seiji

  Crest Jst

• MIYASHITA Seiji

  Department of Applied Physics, University of Tokyo

• MIYASHITA Seiji

  Department of Applied Physics, School of Engineering, University of Tokyo

• MIYASHITA Seiji

  Department of Physics, School of Science, The University of Tokyo

• MIYASHITA Seiji

  Faculty of Integrated Human Studies, Kyoto University

• Tokoro Hiroko

  Department of Physics, The University of Tokyo:JSPS

• BOUKHEDDADEN Kamel

  Laboratoire de Magnetisme et d'Optique, Universite de Versailles

• VARRET Francois

  Laboratoire de Magnetisme et d'Optique, Universite de Versailles

• Nishino Masamichi

  Computational Materials Science Center, National Institute for Materials Science:CREST, JST

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