Magnetic Properties and Metastable States in Spin-Crossover Transition of Co-Fe Prussian Blue Analogues(Condensed matter: structure and mechanical and thermal properties)

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概要

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• The combination of spin transitions and magnetic ordering provides an interesting structure of phase transitions in Prussian blue analogues (PBAs). To understand the structure of stable and metastable states of Co-Fe PBA, it is necessary to clarify free energy as a function of magnetization and the fraction of the high-temperature component. Including the magnetic interaction between high-temperature states, we study the magnetic phase transition of Co-Fe PBA in addition to spin transitions. Here, we take into account the degeneracy changes due to charge transfer between Co and Fe atoms accompanying the spin transition. In this study, the charge transfer between Co and Fe atoms is explicitly taken into account and also the ferrimagnetic structure of Co-Fe PBAs is expressed in the proper way. First, we found systematic changes in the structures of stable and metastable states as functions of system parameters using mean field theory. In particular, the existence of a metastable magnetic-ordered high-temperature state is confirmed at temperatures lower than that of the hysteresis region of spin transitions. Second, we found that the magnetic interaction causes complex ordering processes of a spin transition and a magnetic phase transition. The effect of a magnetic field on the phase structure is also investigated and we found metamagnetic magnetization processes. Finally, the dynamical properties of this metastable state are studied by Monte Carlo method.

• 社団法人日本物理学会の論文
• 2006-11-15

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

• 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

• 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

• 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

• Nishino Masamichi

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

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