Finite Temperature Study of the Itinerant Metamagnetic Transition in Y (Co_<1-x>Al_x)_2
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概要
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Isothermal magnetizations of itinerant metamagnet Y(Co_<1-x>Al_x)_2, x=0.08〜0.11, were measured in static fields up to 23 T at various temperatures 3.6 〜 30 K. Temperature variation of the magnetization M is found to change dramatically around the metamagnetic field H_c, from ∂M/∂T>0 (H<H_c) to ∂M/∂T<0 (H ≥ H_c). Using the thermodynamic relations, the field dependence of the electronic specific heat coefficient γ is estimated. The γ value is enhanced as H approaches H_c from lower field. However, the enhancement is weak and is not divergent, consistent with the first-order transition at H_c. There is a sudden decrease of γ at around H_C, indicating a significant reduction of the density of state or a suppression of the spin fluctuations. For H> H_c, gradual decrease of γ continues to higher fields. These results suggest that the spin fluctuation behavior of this system is strongly affected by the metamagnetic transition.
- 社団法人日本物理学会の論文
- 1995-09-15
著者
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Kido Giyuu
Institute for Materials Research, Tohoku University
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GOTO Tsuneaki
The Institute for Solid State Physics, University of Tokyo
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MITAMURA Hiroyuki
Institute for Solid State Physics, University of Tokyo
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Kido G
National Res. Inst. Metals Tsukuba
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Kido G
National Inst. For Materials Sci. Ibaraki
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Kido Giyuu
Institute For Materials Research Tohoku University
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Kido Giyuu
Nanomaerials Laboratory National Institute For Materials Science
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Kido Giyuu
National Research Institute For Metals
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Goto T
Univ. Tokyo Chiba
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Goto Tsuneaki
The Institute For Solid State Physics The University Of Tokyo
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Goto Tsuneaki
Institute For Solid State Physics University
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Mitamura Hiroyuki
Faculty of Science, Hokkaido University
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Sakakibara Toshiro
Faculty of Science, Hokkaido University
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Kido G
Institute For Materials Research Tohoku University
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