Split Fermi surface properties of LaTGe3 (T:transition metal) and PrCoGe3 with the non-centrosymmetric crystal structure
Split Fermi surface properties of LaTGe3 (T:transition metal) and PrCoGe3 with the non-centrosymmetric crystal structure
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DOI：
10.1143/jpsj.77.064717
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发表时间：
2008-06-01
影响因子：
1.7
通讯作者：
Onuki, Yoshichika
中科院分区：
文献类型：
--
作者：
Kawai, Tomoya;Muranaka, Hiroshi;Onuki, Yoshichika
我们成功地生长出了具有非中心对称四边形晶体结构的LaTGe3 （T: Fe, Co, Rh, Ir）和PrCoGe3单晶，并研究了其分裂费米表面性质和反对称自旋轨道相互作用的大小。当LaTGe3从T = Co， Rh到Ir变化时，垂直于垂直线的2条alpha p值发生变化，而LaIrX3从X = Si到Ge保持不变。结果表明，LaIrSi3和LaIrGe3的2条垂直线alpha p垂直于垂直线的值较大：laoge3的2条垂直线alpha p垂直于垂直线的值为460 K， LaRhGe3为510 K， LaIrSi3为1100 K， LaIrGe3为1090 K。这是由于Ir的有效原子序数大，与Co和Rh相比，Ir-5d电子的径向波函数分布在核中心附近。对于回旋加速器质量较大的顺磁体PrCoGe3和LaFeGe3，其对应的2纵杆α p垂直于纵杆的值变小，PrCoGe3和LaCoGe3的主轨道α p垂直于纵杆的值分别为280和460 K， LaFeGe3的主轨道α p垂直于纵杆的值为130 K。
We succeeded in growing single crystals of LaTGe3 (T: Fe, Co, Rh, Ir) and PrCoGe3 with the non-centrosymmetric tetragonal crystal structure, and studied the split Fermi surface properties and the magnitude of the antisymmetric spin-orbit interaction 2 vertical bar alpha p perpendicular to vertical bar. The 2 vertical bar alpha p perpendicular to vertical bar value is found to vary when LaTGe3 is changed from T = Co, Rh to Ir, but remains unchanged in LaIrX3 from X = Si to Ge. It is found that this 2 vertical bar alpha p perpendicular to vertical bar value is large in LaIrSi3 and LaIrGe3: 2 vertical bar alpha p perpendicular to vertical bar = 460 K in LaCoGe3, 510 K in LaRhGe3, 1100 K in LaIrSi3, and 1090 K in LaIrGe3 for the main outer orbits named alpha of bands 69 and 70 electron Fermi surfaces, for example. This is due to the large effective atomic number of Ir and a large distribution of the radial wave function of Ir-5d electrons close to the nuclear center, compared with those of Co and Rh. In the case of a paramagnet PrCoGe3 and LaFeGe3 with the relatively large cyclotron mass, the corresponding 2 vertical bar alpha p perpendicular to vertical bar value is found to become small: 2 vertical bar alpha p perpendicular to vertical bar= 280 and 460 K for main orbits ot in PrCoGe3 and LaCoGe3, respectively, and 130 K for main orbits in LaFeGe3.