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arXiv 1208.6353cond-mat.str-el
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Mg、Ag和Al掺杂对三角晶格反铁磁体CuCrO2磁激发的影响

Influence of Mg, Ag and Al substitutions on the magnetic excitations in the triangular-lattice antiferromagnet CuCrO2

R. Kajimoto, K. Nakajima, S. Ohira-Kawamura, Y. Inamura, K. Kakurai, T. Hokazono, S. Oozono, T. Okuda

备注：
7 pages, 5 figures
发表信息：
J. Phys. Soc. Jpn. 82 (2013) 054702
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摘要：

用粉末非弹性中子散射方法研究了CuCrO $_{2}$，CuCr $_{0.97}$ Mg $_{0.03}$ O $_{2}$，CuPDMATHABMP Ag $_{0.15}$ CrO $_{2}$和CuCr $_{0.85}$ Al $_{0.15}$ O $_{2}$的磁激发，以阐明元素替代对Heisenberg三角晶格反铁磁体CuCrO $_{2}$自旋动力学的影响. CuCr $_{0.97}$ Mg $_{0.03}$ O $_{2}$中的磁激发由色散分量和平坦分量组成。虽然这一特征与CuCrO $_{2}$相似，但激发光谱的能量结构与CuCrO $_{2}$不同。另一方面，在Cu $_{0.85}$ Ag $_{0.15}$ CrO $_{2}$和CuCr $_{0.85}$ Al $_{0.15}$ O $_{2}$中，平坦组分大大减少，激发光谱的低能部分变得强烈，并且诱导了额外的低能扩散自旋涨落。我们认为，这些变化的磁激发的起源归因于掺杂空穴的影响或磁关联的维数的变化。

英文摘要：

Magnetic excitations in CuCrO$_{2}$, CuCr$_{0.97}$Mg$_{0.03}$O$_{2}$, Cu$_{0.85}$Ag$_{0.15}$CrO$_{2}$, and CuCr$_{0.85}$Al$_{0.15}$O$_{2}$ have been studied by powder inelastic neutron scattering to elucidate the element substitution effects on the spin dynamics in the Heisenberg triangular-lattice antiferromagnet CuCrO$_{2}$. The magnetic excitations in CuCr$_{0.97}$Mg$_{0.03}$O$_{2}$ consist of a dispersive component and a flat component. Though this feature is apparently similar to CuCrO$_{2}$, the energy structure of the excitation spectrum shows some difference from that in CuCrO$_{2}$. On the other hand, in Cu$_{0.85}$Ag$_{0.15}$CrO$_{2}$ and CuCr$_{0.85}$Al$_{0.15}$O$_{2}$ the flat components are much reduced, the low-energy parts of the excitation spectra become intense, and additional low-energy diffusive spin fluctuations are induced. We argued the origins of these changes in the magnetic excitations are ascribed to effects of the doped holes or change of the dimensionality in the magnetic correlations.

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