Temperature and Ag Doping Effect on Magnetic Excitations in the Quasi-Two-Dimensional Triangular Lattice Antiferromagnet CuCrO2 Studied by Inelastic Neutron Scattering

被引：21

作者：

Kajimoto, Ryoichi ^{[1
]}

Nakajima, Kenji ^{[1
]}

Ohira-Kawamura, Seiko ^{[1
]}

Inamura, Yasuhiro ^{[1
]}

Kakurai, Kazuhisa ^{[2
]}

Arai, Masatoshi ^{[1
]}

Hokazono, Takahisa ^{[3
]}

Oozono, Satoshi ^{[3
]}

Okuda, Tetsuji ^{[3
]}

机构：

[1] J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan

[2] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan

[3] Kagoshima Univ, Dept Nanostruct & Adv Mat, Kagoshima 8900065, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 12期

关键词：

triangular lattice antiferromagnet; inelastic neutron scattering; DIFFRACTION;

D O I：

10.1143/JPSJ.79.123705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：3

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