Local Electronic and Crystal Structure of Magnetic RCo2As2 (R = La, Ce, Pr, Eu)
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- Menushenkov, A.P., Yaroslavtsev, A.A., Geondzhian, A.Y. et al. J Supercond Nov Magn (2015) 28: 995. doi:10.1007/s10948-014-2704-z
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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.