Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
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DOI：
10.1103/physrevb.86.081105
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
F. Strigari;T. Willers;Y. Muro;K. Yutani;T. Takabatake;Zhiwei Hu;Y. Chin;S. Agrestini;H.J. Lin;C. Chen;A. Tanaka;M. Haverkort;L. Tjeng;A. Severing
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文献类型：
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作者：
F. Strigari;T. Willers;Y. Muro;K. Yutani;T. Takabatake;Zhiwei Hu;Y. Chin;S. Agrestini;H.J. Lin;C. Chen;A. Tanaka;M. Haverkort;L. Tjeng;A. Severing
我们已经成功地建立了CeRu2Al10，正交金属间化合物最近被确定为近藤绝缘体的晶体场基态。使用偏振相关的软X射线吸收光谱在Ce M4，5的边缘，连同输入从非弹性中子和磁化率实验，我们能够确定明确的轨道占领的4f壳和定量解释测量的磁矩沿着容易的a轴和小有序的时刻沿着c轴。结果不仅提供了一个平台，为现实的建模的自旋和电荷间隙的CeRu2Al 10，但也证明了潜在的软X射线吸收光谱，以获得信息不容易获得的中子技术的研究近藤绝缘体一般。
We have succeeded in establishing the crystal-field ground state of CeRu2Al10, an orthorhombic intermetallic compound recently identified as a Kondo insulator. Using polarization dependent soft x-ray absorption spectroscopy at the Ce M4,5 edges, together with input from inelastic neutron and magnetic susceptibility experiments, we were able to determine unambiguously the orbital occupation of the 4f shell and to explain quantitatively both the measured magnetic moment along the easy a axis and the small ordered moment along the c-axis. The results provide not only a platform for a realistic modeling of the spin and charge gap of CeRu2Al10, but demonstrate also the potential of soft x-ray absorption spectroscopy to obtain information not easily accessible by neutron techniques for the study of Kondo insulators in general.