Evidence for Short-Range Antiferromagnetic Fluctuations in Kondo-Insulating YbB12
Evidence for Short-Range Antiferromagnetic Fluctuations in Kondo-Insulating YbB12
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近藤绝缘 YbB12 中短程反铁磁涨落的证据
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Japan.
中科院分区：
文献类型：
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作者：
J. Mignot;P. Alekseev;K. Nemkovski;L. Regnault;F. Iga;T. S. L. L. Brillouin;CEA;Saclay;France.;Russian Research CenterKurchatov Institute;Moscow;Russia.;Drfmcspsms;Cea;Grenoble;AdSM;H. University;Japan.
用非弹性中子散射在高质量单晶上研究了混价YbB12的自旋动力学。在低温下实现的近道绝缘状态下，光谱呈现自旋-间隙结构，在h!处有两个尖锐的、色散的间隙内激发。14:5和20英镑。低模态与反铁磁波矢量q0°1附近的短程相关有关；1;1……它的性质与间接杂化隙半导体中“自旋激子”分支的性质完全一致。
The spin dynamics of mixed-valence YbB12 has been studied by inelastic neutron scattering on a highquality single crystal. In the Kondo-insulating regime realized at low temperature, the spectra exhibit a spin-gap structure with two sharp, dispersive, in-gap excitations at � h! � 14:5 and � 20 meV. The lower mode is shown to be associated with short-range correlations near the antiferromagnetic wave vector q0 �� 1 ; 1 ; 1 � . Its properties are in overall agreement with those expected for a ‘‘spin-exciton’’ branch in an indirect hybridization gap semiconductor.