A Magnetic Transition Probed by the Ce Ion in Square-Lattice Antiferromagnet CeMnAsO
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概要
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We examined the magnetic properties of the square-lattice antiferromagnets CeMnAsO and LaMnAsO and their solid solutions La1-xCexMnAsO by resistivity, magnetic susceptibility, and heat capacity measurements below room temperature. A first-order phase transition is observed at 34.1 K, below which the ground-state doublet of the Ce ion splits by 3.53 meV. It is likely that Mn moments already ordered above room temperature are reoriented at the transition, as reported for related compounds, such as NdMnAsO and PrMnSbO. This transition generates a large internal magnetic field at the Ce site in spite of the fact that simple Heisenberg interactions should be cancelled out at the Ce site owing to geometrical frustration. The transition takes place at nearly the same temperature with the substitution of La for Ce up to 90%. The Ce moment does not undergo long-range order by itself, but is parasitically induced at the transition, serving as a good probe for detecting the magnetism of Mn spins in a square lattice.
- 2011-09-15
著者
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Okamoto Yoshihiko
Institute For Solid State Physics University Of Tokyo
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Matsuhira Kazuyuki
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
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Matsuhira Kazuyuki
Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
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WHANGBO Myung-Hwan
Department of Chemistry, North Carolina State University, Raleigh, NC 27695, U.S.A.
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Whangbo Myung-Hwan
Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, U.S.A.
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Tsukamoto Yuto
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Okamoto Yoshihiko
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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