Magnetic Field- and Pressure-Induced Quantum Phase Transitions in NH_4CuCl_3(Magnetization Plateaus, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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Quantum antiferromagnet NH_4CuCl_3 shows magnetization plateaus at 1/4 and 3/4 of the saturation magnetization. Specific heat measurements at ambient pressure and magnetization measurements under hydrostatic pressure were performed on NH_4CuCl_3 in magnetic fields. From specific heat measurements, we obtained the detailed magnetic phase diagram below 9T, which includes the lower edge field H_<c1> of 1/4 plateau. The phase boundary just below H_<c1> can be described by a power low, H_<c1>-H_N(T)∝T^φ with φ=2, where H_N(T) is the transition field at temperature T. Magnetic susceptibility measurements under pressure revealed reentrant quantum phase transitions, such that the gapless ground state at zero field changes into gapped state with increasing pressure, and further into gapless state again.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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FUJISAWA Masashi
Department of Physics, Tokyo Institute of Technology
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TANAKA Hidekazu
Research Center for Low Temperature Physics, Tokyo Institute of Technology
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ONO Toshio
Department of Physics, Tokyo Institute of Technology
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Hiraoka T
Faculty Of Integrated Arts And Science Hiroshima University
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Ono T
Department Of Physics Tokyo Institute Of Technology
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Ono Toshio
Department Of Oral Biochemistry Nagasaki University School Of Dentistry
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KURNIAWAN Budhy
Department of Physics, University of Indonesia
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Takei Humihiko
Institute For Iron Steel And Other Metals Tohoku University
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Hiraoka T
Faculty Of Science And Engineering Saga University
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Kurniawan Budhy
Department Of Physics University Of Indonesia
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Kurniawan Budhy
Department Of Physics Tokyo Institute Of Technology
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Fujisawa M
Department Of Physics Tokyo Institute Of Technology
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Fujisawa Masashi
Department Of Physics Tolyo Institute Of Technology
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Fujisawa Masashi
Department Of Physics Tokyo Institute Of Technology
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Tanaka Hidekazu
Research Center For Low Temperature Physics Tokyo Institute Of Technology
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