Generalized Wajnflasz Model for Charge Transfer Spin-Crossover Phenomena

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概要

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• A kind of spin-crossover phenomena associated with charge transfer has been found in (n-C_3H_7)4_N[Fe^<II>Fe^<III>(dto)_3], where dto represents C_20_2S_2. The properties of this phase transition are studied in a generalized Wajnflasz model. The fraction of the high temperature phase configuration is obtained as a function of the temperature. In the high temperature limit, the fraction is 1/(1+√<3/5>), and it decreases smoothly to zero as the temperature decreases, if we consider free migration of electrons. When a repulsive interaction between the domains of the high temperature and low temperature phases exists, this fraction exhibits a first-order transition at a certain temperature. The temperature dependences of the susceptibility and the magnetic phase transition in the low temperature phase are also investigated. It turns out that a magnetic phase transition in the low temperature phase is induced by fluctuations of the high temperature phase.

• 2003-05-25

著者

• MIYASHITA Seiji

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

• KOJIMA Norimichi

  Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo

• 小島 憲道

  Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo

• Kojima N

  Graduate School Of Arts And Sciences University Of Tokyo

• Kojima Norimichi

  Graduate School Of Arts And Science University Of Tokyo

• Kojima Norimichi

  Department Of Basic Science Graduate School Of Arts And Science The University Of Tokyo

• Miyashita S

  Univ. Tokyo Tokyo Jpn

• Miyashita Seiji

  Department Of Physics University Of Tokyo

• Miyashita Seiji

  Graduate School Of Human And Environmental Studies Kyoto University

• 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

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