Fermi Surface Properties and Antisymmetric Spin–Orbit Coupling in Noncentrosymmetric CeCoSi3
Fermi Surface Properties and Antisymmetric Spin–Orbit Coupling in Noncentrosymmetric CeCoSi3
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DOI：
10.1143/jpsj.80.083701
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发表时间：
2011-07
影响因子：
1.7
通讯作者：
Hiroki Iida;Y. Kadota;M. Kogure;T. Sugawara;H. Aoki;N. Kimura
中科院分区：
文献类型：
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作者：
Hiroki Iida;Y. Kadota;M. Kogure;T. Sugawara;H. Aoki;N. Kimura
本文报道了对中价化合物CeCoSi 3的de Haas-van Alphen（dHvA）效应的测量，CeCoSi 3的晶体结构不具有空间反转对称性。CeCoSi 3的dHvA频率定性地对应于CeRhSi 3的dHvA频率，CeRhSi 3是一种重费米子反铁磁体，具有压力诱导超导性。我们观察到多重分裂dHvA频率，并将其归因于两个分离的费米面之间的磁击穿，由于反对称自旋轨道耦合（ASOC）。引人注目的是，分离的费米面的回旋有效质量有很大的不同，表明质量增强取决于自旋方向。CeCoSi 3的ASOC能量小于LaCoGe 3，这可能是具有巡游f电子的重费米子带的特征。
We report de Haas–van Alphen (dHvA) effect measurement of the intermediate-valence compound CeCoSi 3 whose crystal structure lacks space-inversion symmetry. Some dHvA frequencies of CeCoSi 3 qualitatively correspond to those of CeRhSi 3 which is a heavy-fermion antiferromagnet exhibiting pressure-induced superconductivity. We observed multiply splitting dHvA frequencies and attributed them to the magnetic breakdown between two separated Fermi surfaces due to the antisymmetric spin–orbit coupling (ASOC). Strikingly, the cyclotron effective masses of the separated Fermi surfaces are largely different, indicating that the mass enhancement depends on the spin direction. The evaluated ASOC energy of CeCoSi 3 is less than that of LaCoGe 3 , which is probably characteristic of a heavy-fermion band with an itinerant f -electron.