Crystal field excitations in the cubic compound Ce3Rh4Sn13

被引:16
作者
Adroja, D. T. [1 ]
Strydom, A. M. [2 ]
Murani, A. P. [3 ]
Kockelmann, W. A. [1 ]
Fraile, A. [4 ,5 ]
机构
[1] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[2] Univ Johannesburg, Dept Phys APK, Johannesburg, South Africa
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[4] Univ Zaragoza, Dpto Fis Mat Condensada, Magnetism Lab, E-50009 Zaragoza, Spain
[5] Univ Zaragoza, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
关键词
crystal field excitations; inelastic neutron scattering; Kondo effect; Ce3Rh4Sn13;
D O I
10.1016/j.physb.2007.10.246
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The recent heat capacity measurements of Ce3Rh4Sn13 have revealed a broad peak at I K with an entropy of 3R ln(2) per f.u., but no clear sign of any magnetic ordering down to 100 mK. In order to understand this anomalous heat capacity behaviour of Ce3Rh4Sn13, we have carried out low- and high-energy inelastic neutron scattering measurements. Our high-energy studies reveal two well-resolved crystal field (CF) excitations at similar to 9 meV and 38 meV. The observation of two CF excitations in the cubic structure of Ce3Rh4Sn13 could be explained on the basis of tetragonal point symmetry of the Ce ions. Interestingly, the low-energy measurements apparently show, or are best described by, a quasi-elastic peak and an inelastic peak at similar to 0.2 meV at 1.5 K, both of Lorentzian shape. We attribute the low-energy peak to Zeeman splitting of the ground state doublet, in the presence of short range magnetic ordering. Further, the low-energy peak explains the observed anomaly in the heat capacity. Published by Elsevier B.V.
引用
收藏
页码:898 / 899
页数:2
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