Magnetic susceptibility study of Ce<sup>3+sup> in PbCeA (A=Te, Se, S)
- 作者：X. Gratens<sup>asup><sup> ; sup><sup>xgratens@gmail.comsup> ; S. Isber<sup>bsup><sup> ; sup><sup>1sup><sup> ; sup><sup>si00@aub.edu.lbsup> ; S. Charar<sup>csup><sup> ; sup><sup>salam.charar@iut-nimes.frsup> ; Z. Golacki<sup>dsup>
- 关键词：Magnetic susceptibility ; Zero-field splitting
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：September, 2012
- 卷：324
- 期：18
- 页码：2761-2764
- 文件大小：205 K
摘要
The magnetic susceptibility of Pb<sub>1-xsub>Ce<sub>xsub>A (A=S, Se and Te) crystals with Ce<sup>3+sup> concentrations 0.006鈮?em>x鈮?.036 was investigated in the temperature range from 2 K to 300 K. The magnetic susceptibility data was found to be consistent with a <sup>2sup>F<sub>5/2sub> lowest manifold for Ce<sup>3+sup> ions with a crystal-field splitting 螖=E(螕<sub>8sub>)鈭?em>E(螕<sub>7sub>) of about 340 K, 440 K and 540 K for Pb<sub>1-xsub>Ce<sub>xsub>Te, Pb<sub>1-xsub>Ce<sub>xsub>Se, and Pb<sub>1-xsub>Ce<sub>xsub>S, respectively. For all the three compounds the doublet 螕<sub>7sub> lies below the 螕<sub>8sub> quadruplet which confirms the substitution of Pb<sup>2+sup> by Ce<sup>3+sup> ions in the host crystals. The observed values for the crystal-field splitting are in good agreement with the calculated ones based on the point-charge model. Moreover, the effective Land茅 factors were determined by X-band (鈭?.5 GHz), electron paramagnetic measurements (EPR) to be g=1.333, 1.364, and 1.402 for Ce ions in PbA, A = S, Se and Te, respectively. The small difference with the predicted Land茅 factor g of 10/7 for the 螕<sub>7sub> (J=5/2) ground state was attributed to crystal-field admixture.