Mass Enhancement of Nearly Trivalent Compound EuCo2Si2: Studied by the de Haas-van Alphen Experiments and Energy Band Calculations

International Conference on Strongly Correlated Electron Systems 2014

O'Nuki, Yoshichika^1 ; Nakamura, Ai^2 ; Aoki, Dai^3,4 ; Boukahil, Mounir^4 ; Haga, Yoshinori^5 ; Takeuchi, Tetsuya^6 ; Harima, Hisatomo^7 ; Hedo, Masato^1 ; Nakama, Takao^1

Faculty of Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^1

Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^2

Institute for Materials Research, Tohoku University, Oarai, Ibaraki

311-1313, Japan^3

INAC/SPSMS, CEA-Grenoble, 17 rue des Martyrs, Grenoble

38054, France^4

Advanced Science Research Center, Japan Atomic Energy Research Institute, Ibaraki-Tokai

319-1195, Japan^5

Low Temperature Center, Osaka University, Osaka, Toyonaka

560-0043, Japan^6

Graduate School of Science, Kobe University, Kobe

657-8501, Japan^7

关键词: Cyclotron-effective mass;    De Haas-van Alphen;    De Haas-van Alphen (dHvA);    Energy band calculation;    Full potential linearized augmented plane waves;    LDA + U;    Mass enhancement;    Trivalent compounds;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012049/pdf
DOI  :  10.1088/1742-6596/592/1/012049

来源: IOP

【 摘 要 】

We succeeded in growing single crystals of EuCo2Si2by the Bridgman method, and carried out the de Haas-van Alphen (dHvA) experiments. EuCo2Si2was previously studied from a viewpoint of the trivalent electronic state on the basis of the magnetic susceptibility and X-ray absorption experiments, whereas most of the other Eu compounds order magnetically, with the divalent electronic state. The detected dHvA branches in the present experiments are found to be explained by the results of the full potential linearized augmented plane wave energy band calculations on the basis of a local density approximation (LDA) for YCo2Si2(LDA) and EuCo2Si2(LDA + U), revealing the trivalent electronic state. The detected cyclotron effective masses are moderately large, ranging from 1.2 to 2.9 m0.