First-Order Phase Transitions in Frustrated Spin Systems
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概要
- 論文の詳細を見る
We give a short review of our recent works on the first-order quantum phase transitions in frustrated spin chains with orthogonal-dimer structure. When the ratio of the competing antiferromagnetic exchange couplings is varied, a first-order transition occurs between the dimer phase and the plaquette phase, which is accompanied by the discontinuity in the spin excitation gap. We further show that strong frustration triggers the phase transitions in a magnetic field, which exhibit plateaus and jumps in the magnetization curve. The hole-doping effect is also addressed for the orthogonal-dimer chain with linked-tetrahedra structure. It is found that the competing antiferromagnetic interactions result in a first-order metal-insulator transition upon hole doping.
- 理論物理学刊行会の論文
- 2002-06-28
著者
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OKUNISHI Kouichi
Department of Physics, Niigata University
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KOGA Akihisa
Department of Applied Physics, Osaka University
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Koga Akihisa
Department Of Applied Physics Osaka University
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KAWAKAMI Norio
Department of Applied Physics, Osaka University
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Kawaguchi Akira
Department Of Applied Physics Osaka University
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Kawakami Norio
Department Of Applied Physics Osaka University
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Okunishi Kouichi
Department Of Physics Faculty Of Science Niigata University
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Okunishi Kouichi
Department Of Physics Niigata University
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Okunishi Kouichi
Department Of Physics Faculty Of Science Niigata Univeristy
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Kawaguchi Akira
Department Of Marine Sciences Faculty Of Science University Of The Ryukyus
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Kawaguchi Akira
Department Of Appkied Physics Osaka University
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Kawaguchi Akira
Laboratory Of Soil Microbiology Division Of Soil Science And Plant Production Department Of Plant Re
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古賀 章彦
Division Of Biological Science Graduate School Of Science Nagoya University
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Koga Akihiko
Department Of Appkied Physics Osaka University
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Okunishi Kouich
Department Of Physics Faculty Of Science Niigata University
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KAWAGUCHI Akira
Department of Applied Physics, Osaka University
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OKUNISHI Kouichi
Department of Applied Physics, Graduate School of Engineering Osaka University
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