Specific Heat Study of the Impurity- and Field-Induced Antiferromagnetic Ordering in TlCu_<1-x>Mg_xCl_3(Impurity and Pressure Effects, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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Specific heat measurements have been performed in the doped spin gap system TlCu_<1-x>Mg_xCl_3 with x≤0.3 in order to investigate the impurity- and field-induced antiferromagnetic phase transitions. The parent compound TlCuCl_3 is a three-dimensional coupled spin dimer system, which has a singlet ground state with an excitation gap Δ/κ_B=7.5K. Well-defined phase transitions were observed in TlCu_<1-x>Mg_xCl_3 for H≤9 T. The magnetic field vs temperature phase diagram was obtained. It was found that there is no boundary separating impurity- and field-induced antiferromagnetic phases, i.e., these two phases are identical. The result is discussed in connection with the recent theory by Mikeska et al.
- 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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Fujiwara Hideyasu
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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