On the Mechanism of the Spin State Transition of (Pr_<1-y>Sm_y)_<1-x>Ca_xCoO_3(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• Transport, thermal, and magnetic measurements have been carried out on (Pr_<1-y>Sm_y)_<1-x>Ca_xCoO_3. The system exhibits a structural phase transition accompanied by the spin state change from the intermediate spin (IS) state to the low spin (LS) state with decreasing temperature T. We have constructed a T-y phase diagram for x=0.3 and T-x ones for y=0.2 and 0.3. By analyzing their magnetic susceptibilities, the number of Co ions excited to the IS state (or the electron number in the e_g orbitals), n_<IS>, is roughly estimated. With increasing y or with decreasing x, n_<IS> decreases, and the phase transition changes gradually to the (IS→LS) crossover-like one. We discuss the possible role of the Pr atoms in realizing the transition.

• 社団法人日本物理学会の論文
• 2005-08-15

著者

• SATO Masatoshi

  Department of Physics,Division of Material Science,Nagoya University

• UWATOKO Yoshiya

  Institute for Solid State Physics, The University of Tokyo

• KAWABATA Shohei

  Department of Physics, Division of Material Science, Nagoya University

• FUJITA Toshiaki

  Department of Physics, Division of Material Science, Nagoya University

• HEDO Masato

  Institute for Solid State Physics, University of Tokyo

• Hedo Masato

  Institute For Solid State Physics The University Of Tokyo

• Hedo Masato

  Institute For Solid State Physics (issp) The University Of Tokyo

• KURITA Nobuyuki

  Institute for Solid State Physics, The University of Tokyo

• Fujita Toshiaki

  Department Of Applied Physics And Chemistry Faculty Of Engineering Hiroshima University

• Kawabata Shohei

  Department Of Physics Division Of Material Science Nagoya University

• Kawabata Shohei

  Department Of Physics Nagoya University

• Uwatoko Yoshiya

  Institute For Solid State Physics (issp) The University Of Tokyo

• Sato Masatoshi

  Department Of Electrical And Electronics Engineering Sophia University

• Kurita Nobuyuki

  Institute For Solid State Physics The University Of Tokyo

• Fujita Toshiaki

  Department Of Physics Nagoya University

• Sato Masatoshi

  Department Of Agro-environmental Science Obihiro University Of Agriculture And Veterinary Medicine

• KAWABATA Shohei

  Department of Physics, Nagoya University

• HEDO Masato

  Institute for Solid State Physics, The University of Tokyo

• FUJITA Toshiaki

  Department of Physics, Nagoya University

• SATO Masatoshi

  Department of Physics, Nagoya University

• Uwatoko Yoshiya

  Institute for Solid State Physics

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