Marked Change in the Ground State of CeRu
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概要
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We have investigated the marked change in the magnetic properties of CeRu<inf>2</inf>Al<inf>10</inf>induced by a small amount of Rh substitution [Ce(Ru<inf>0.95</inf>Rh<inf>0.05</inf>)<inf>2</inf>Al<inf>10</inf>]. The magnetic susceptibility along the a-axis (\chi_{a}) shows a large decrease with decreasing temperature after showing a sharp peak at T_{0}=24 K and the high field magnetization for the magnetic field along the a-axis exhibits a spin-flop transition at {\sim}13 T. These indicate that the antiferromagnetic (AFM) order where the AFM moment is parallel to the a-axis takes place, which is consistent with the anisotropy of \chi_{a}>\chi_{c}>\chi_{b} in the paramagnetic region, being different from the AFM order in CeRu<inf>2</inf>Al<inf>10</inf>. These results were analyzed by mean field calculation for the two-sublattice model using the crystalline electric field level scheme by Strigari et al. [Phys. Rev. B 86 (2012) 081105]. On the basis of both experimental and calculated results, we conclude that, by a small amount of Rh substitution with one extra 4d electron, the large c--f hybridization along the a-axis, leading to the unusual ground state of CeRu<inf>2</inf>Al<inf>10</inf>, is markedly suppressed and the Ce ion in a Rh-substituted sample becomes close to the normal localized magnetic ion.
- 2013-05-15
著者
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Sera Masafumi
Department Of Physics Faculty Of Science Nagoya University
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Kindo Koichi
Institute For Solid State Physics The University Of Tokyo
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Tanida Hiroshi
Department Of Physics Graduate School Of Science Tohoku University:(present Office)department Of Qua
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Kunimori Keisuke
Department of Quantum Matter, AdSM, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan
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Nishioka Takashi
Graduate School of Integrated Arts and Science, Kochi University, Kochi 780-8520, Japan
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Matsumura Masahiro
Graduate School of Integrated Arts and Science, Kochi University, Kochi 780-8520, Japan
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Kondo Akihiro
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Nohara Hiroki
Department of Physics, Kobe University, Kobe 657-8501, Japan
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Kobayashi Riki
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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