Localization of Spin Triplets in Quantum Dimer System Tl_<1-x>K_xCuCl_3(Field-Induced Magnetic Ordering, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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The effect of exchange randomness on the ground state and the field-induced magnetic ordering was investigated through specific heat and magnetization measurements in Tl_<1-x>K_xCuCl_3 with x≤0.22. The isostructural parent compounds TlCuCl_3 and KCuCl_3 are coupled spin dimer systems with a gapped singlet ground state and their field-induced antiferromagnetic ordering is described by the Bose condensation of spin triplets. Due to exchange randomness, the low-field singlet ground state turns into the magnetic state with finite susceptibility. However, the gap for the triplet excitation still remains. Well-defined field-induced phase transitions were observed in Tl_<1-x>K_xCuCl_3. The relation between transition field H_N(T) and temperature is represented by the power law H_N(T)-H_c∝T^φ. Systematic decrease of the critical exponent φ with x is observed. These properties are discussed in connection with Bose gas in the presence of random potential.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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TANAKA Hidekazu
Research Center for Low Temperature Physics, Tokyo Institute of Technology
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OOSAWA Akira
Advanced Scientific Research Center, Japan Atomic Energy Research Institute
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Oosawa Akira
Advanced Science Research Center Japan Atomic Energy Research Institute
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SHINDO Yosuke
Department of Physics, Tokyo Institute of Technology
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Shindo Yosuke
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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OOSAWA Akira
Advanced Science Research Center, Japan Atomic Energy Research Institute
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