Thermodynamical Study of (DMe-DCQNI)_2Cu System : Mechanism of Reentrant Metal-Insulator Transition : Condensed Matter: Structure, etc.
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概要
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We have experimentally studied the mechanism of reentrant metal-insulator-metal transition of DCNQI-Cu system. Measurements of specific heat and latent heat were carried out by thermal relaxation (0.5 < T < 40 K), adiabatic pulse (20 < T < 100 K) and Differential Thermal Analysis (DTA) methods on samples under various chemical pressures. From the experimental results, we determined the Gibbs free energy difference between metallic and insulating phases and succeeded to draw the phase diagram that reproduces the experimental result quite well. We conclude that the free energy change of free electrons (metallic phase) to localized electrons with spin 1/2 (insulating phase) is essential to drive the anomalous phase transition in this system. Contribution of lattice system is also clarified.
- 社団法人日本物理学会の論文
- 2000-05-15
著者
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KOBAYASHI Hayao
Institute for Molecular Science, and CREST, Japan Science and Technology Agency
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SAWA Hiroshi
Photon Factory, Institute of Materials Structure Science
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Sawa H
Institute Of Materials Structure Science Kek
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Suematsu H
Spring-8
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Sawa Hiroshi
Department Of Physics Aoyama-gakuin University
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NISHIO Yutaka
Faculty of Science, Toho University
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KAJITA Koji
Faculty of Science, Toho University
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Nishio Y
Department Of Physics Faculty Of Science Toho University
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Aonuma S
Faculty Of Engineering Osaka Electro-communication University
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Aonuma Shuji
Institute For Solid State Physics University Of Tokyo
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Aonuma Shuji
Institute For Solid State Physics The University Of Tokyo
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KOBAYASHI Keisuke
Japan Synchrotron Radiation Research Institute/SPring-8
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Aonuma Shuji
Faculty Of Engineering Osaka Electro-communication University
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Koyama K
Institute For Solid State Physics University Of Tokyo
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Kato R
Riken (the Institute Of Physical And Chemical Research) Jst-crest
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Koyama K
Institute For Solid State Physics University:(present)institute Of Materials Research Tohoku Univers
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Tamura Masafumi
Faculty Of Pharmaceutical Sciences Josai University
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Tamura Masafumi
Condensed Molecular Materials Lab. Riken
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Kuroda H
Institute For Solid State Physics University Of Tokyo
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Kato Reizo
Condensed Molecular Materials Lab. Riken
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KATO Reizo
The Institute of Physical and Chemical Research
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SAWA Hiroshi
Faculty of Science, Chiba University
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Sawa Hiroshi
Photon Factory Institute Of Materials Structure Science
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Sawa Hiroshi
Institute For Solid State Physics University Of Tokyo
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Kurai Hiroyuki
Department Of Organic And Polymeric Materials Tokyo Institute Of Technology
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Kobayashi H
Department Of Chemistry College Of Humanities And Sciences Nihon University
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Kobayashi Hayao
Institute For Molecular Science
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Kajita Koji
Faculty Of Science Toho University
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Koyama Keiichi
Tohoku Univ. Sendai Jpn
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Sato Hirohiko
Department Of Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Kobayashi Hayao
Institute For Molecular Science And Crest Jst
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Nishio Y
Osaka Univ. Toyonaka
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Koyama Keiichi
High Field Laboratory For Superconducting Materials Institute For Materials Research Tohoku Universi
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Nishio Y
Toho Univ. Chiba
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Nishino Yutaka
Department of Physics, Faculty of Science, Toho University
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Koyama Keiichi
Department of Physics, Faculty of Science, Toho University
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Tamura Masafumi
Condensed Molecular Materials Lab., RIKEN
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Kato Reizo
Condensed Molecular Materials Lab., RIKEN
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