Low Temperature Specific Heat of Dy_2Ti_2O_7 in the Kagome Ice State(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report the specific heat of single crystals of the spin ice compound Dy_2Ti_2O_7 at temperatures down to lOOmK in the so-called Kagome ice state. In our previous paper, we showed the anisotropic release of residual entropy in different magnetic field directions and reported new residual entropy associated with spin frustration in the Kagome slab for field in the [111] direction. In this paper, we confirm the first-order phase transition line in the field-temperature phase diagram and the presence of a critical point at (0.98 T, 400 mK), previously reported from the magnetization and specific-heat data. We newly found another peak in the specific heat at 1.25T below 0.3 K. One possible explanation for the state between 1 T and 1.25 T is the coexistence of states with different spin configurations including the 2-in 2-out state (Kagome ice state), the 1-in 3-out state (ordered state) and paramagnetic state (free-spin state).
- 社団法人日本物理学会の論文
- 2004-10-15
著者
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MAENO Yoshiteru
Department of Physics, Graduate School of Science, Kyoto University
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FUKAZAWA Hideto
Department of Physics, Chiba University
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DEGUCHI Kazuhiko
Department of Physics, Graduate School of Science, Nagoya University
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Maeno Yoshiteru
Department Of Physics Faculty Of Science Hiroshima University
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Fukazawa Hideto
Department Of Physics Kyoto University : (present Address)graduate School Of Science And Technology
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Fukazawa H
Department Of Physics Kyoto University : (present Address)graduate School Of Science And Technology
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Fukazawa Hideto
Department Of Physics Chiba University
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HIGASHINAKA Ryuji
Department of Physics, Kyoto University
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Deguchi Kazuhiko
Department Of Physics Kyoto University
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Deguchi Kazuhiko
Department Of Physics Graduate School Of Science Kyoto University
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Higashinaka Ryuji
Department Of Physics Kyoto University
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