Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

Materials

Sachin Gupta¹  K.G. Suresh²  LubovN. Gramateeva³  AlexeyV. Lukoyanov³  YuryI. Kuz’min³  YuryV. Knyazev³ 

[1] Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan;Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India;M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620108 Ekaterinburg, Russia;

关键词: intermetallics;    electronic structure;    magnetic properties;    electronic correlations;    optical conductivity;   

DOI  :  10.3390/ma13163536

来源: DOAJ

【 摘 要 】

In this study, the ab initio and experimental results for RCuGe ternary intermetallics were reported for R = Tb, Dy, Ho, Er. Our theoretical calculations of the electronic structure, employing local spin density approximation accounting for electron–electron correlations in the 4f shell of Tb, Dy, Ho, Er ions were carried in DFT+U method. The optical properties of the RCuGe ternary compounds were studied at a broad range of wavelengths. The spectral and electronic characteristics were obtained. The theoretical electron densities of states were taken to interpret the experimental energy dependencies of the experimental optical conductivity in the interband light–absorption region. From the band calculations, the 4f shell of the rare-earth ions was shown to provide the major contribution to the electronic structure, magnetic and optical properties of the RCuGe intermetallics. The accounting for electron–electron correlations in Tb, Dy, Ho, Er resulted in a good agreement between the calculated and experimental magnetic and optical characteristics.

【 授权许可】

Unknown