MAGNETIC EXCITATION SPECTRUM OF MIXED-VALENCE SMB6 STUDIED BY NEUTRON-SCATTERING ON A SINGLE-CRYSTAL
MAGNETIC EXCITATION SPECTRUM OF MIXED-VALENCE SMB6 STUDIED BY NEUTRON-SCATTERING ON A SINGLE-CRYSTAL
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DOI：
10.1088/0953-8984/7/2/007
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发表时间：
1995-01-09
影响因子：
2.7
通讯作者：
PADERNO, YB
中科院分区：
文献类型：
--
作者：
ALEKSEEV, PA;MIGNOT, JM;PADERNO, YB
采用低吸收双同位素(SmB6)-Sm-154-B-11单晶，用非弹性中子散射法研究了混价六硼化钐的顺磁响应。在2至100 K的温度范围内，对小于或等于h ω小于或等于50 meV的能量转移进行了测量。在光谱中观察到两个主要贡献：在h ω相似或等于36 meV处出现单离子型的宽互重跃迁，以及以h ω相似或等于14 meV为中心的窄低能激发，该激发具有很强的各向异性和温度依赖性，并表现出微弱但可见的色散。由于f电子杂化效应，后一种激发似乎是混合价态的固有特征，这表明在Sm位点周围形成了局部束缚态。
The paramagnetic response of mixed-valence samarium hexaboride has been studied by inelastic neutron scattering using a low-absorption double-isotope single crystal of (SmB6)-Sm-154-B-11. Measurements were performed for energy transfers 0 less than or equal to h omega less than or equal to 50 meV at temperatures ranging from 2 to 100 K. Two main contributions were observed in the spectra: a broad intermultiplet transition of single-ion type at h omega similar or equal to 36 meV, and a narrow low-energy excitation centred at h omega similar or equal to 14 meV, which is strongly anisotropic and temperature dependent and exhibits a weak but visible dispersion. The latter excitation appears to be an inherent feature of the mixed-valence state due to f-electron hybridization effects, which denotes the formation of a local bound state around the Sm sites.