Temperature and Ag Doping Effect on Magnetic Excitations in the Quasi-Two-Dimensional Triangular Lattice Antiferromagnet CuCrO2 Studied by Inelastic Neutron Scattering
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概要
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We have studied magnetic excitations in quasi-two-dimensional triangular lattice antiferromagnets CuCrO2 and Cu0.85Ag0.15CrO2 by inelastic neutron scattering. CuCrO2 has two types of magnetic excitations: one is highly dispersive, while the other is less dispersive and spreads over a wide $Q$ range. With increasing temperature, the weight of the latter component transfers to a lower energy, and the spin dynamics becomes a mixture of a disordered spin wave and another diffuse component. Ag doping induces a similar spin dynamics even at 5 K. This manifests the impact of Ag doping on magnetic correlations and gives a clue to understanding the unconventional spin state in the Ag-doped CuCrO2.
- 2010-12-15
著者
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Okuda Tetsuji
Department Of Nano-structures And Advanced Materials Kagoshima University:presto Jst
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Kakurai Kazuhisa
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Hokazono Takahisa
Department Of Nano-structures And Advanced Materials Kagoshima University
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Arai Masatoshi
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195
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Kajimoto Ryoichi
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Kajimoto Ryoichi
Materials and Life Science Division, J-PARC Center, JAEA, Tokai, Ibaraki 319-1195, Japan
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Ohira-Kawamura Seiko
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Nakajima Kenji
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Inamura Yasuhiro
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Oozono Satoshi
Department of Nano-Structures and Advanced Materials, Kagoshima University, Kagoshima 890-0065, Japan
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Inamura Yasuhiro
Materials and Life Science Division, J-PARC Center, JAEA, Tokai, Ibaraki 319-1195, Japan
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Okuda Tetsuji
Department of Nano-Structures and Advanced Materials, Kagoshima University, Kagoshima 890-0065, Japan
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Arai Masatoshi
Materials and Life Science Division, J-PARC Center, JAEA, Tokai, Ibaraki 319-1195, Japan
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Ohira-Kawamura Seiko
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Nakajima Kenji
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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