Local Electronic and Crystal Structure of Magnetic RCo2As2 (R = La, Ce, Pr, Eu)
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The experimental X-ray absorption data on the recently prepared magnetic arsenides RCo2As2 (R = rare earth) are provided. The oxidation state of rare-earth ions is explored by means of the X-ray absorption near edge structure (XANES) spectroscopy. Ce and Eu exhibit the intermediate valence state. The rare-earth valence instability sensitive to external perturbations opens the way for the influencing the magnetic state of RCo2As2 compounds.
KeywordsCerium Europium Cobalt Valence Magnetic XAS
Authors acknowledge Helmholtz-Zentrum Berlin for providing the beamtime at BESSY-II storage ring, Dr. Ivo Zizak and Dr. Dirk Wallacher for the assistance during the XAS experiment. A.P.M., A.A.Y., and A.Y.G. are grateful to the Russian Foundation for Basic Research (Project No. 14-22-01002-ofi_m) for the financial support. X. T. and M. S. also acknowledge the U.S. National Science Foundation for the support of research on itinerant magnets via the NSF-CAREER grant, DMR-0955353.
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