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Abstract
We succeeded in growing single crystals of EuCo2Si2 by the Bridgman method, and carried out the de Haas-van Alphen (dHvA) experiments. EuCo2Si2 was 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.
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1 Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
2 Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan
3 Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313, Japan; INAC/SPSMS, CEA-Grenoble, 17 rue des Martyrs 38054 Grenoble, France
4 INAC/SPSMS, CEA-Grenoble, 17 rue des Martyrs 38054 Grenoble, France
5 Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
6 Low temperature Center, Osaka University, Toyonaka, Osaka 560-0043, Japan
7 Graduate School of Science, Kobe University, Kobe 657-8501, Japan