Abstract
The pressure effect on the europium valence state was investigated by means of X-ray absorption spectroscopy in the series of samples based on the EuCo2As2 compound. The pressure dependence of the europium valence was obtained in a wide range of applied and chemical pressures; the latter was reached by substituting Ca for Eu. The correlation between these two ways to impact the Eu valence was established. The data obtained allow estimating the pressure effect on the electronic structure of EuCo2As2 and other related properties such as the change in magnetic ordering.
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Acknowledgments
This work was supported by the Russian Science Foundation (grant 14-22-00098). Authors acknowledge Helmholtz-Zentrum Berlin for providing the beamtime at experimental station mySpot of BESSY-II storage ring, MAX IV Laboratory for providing the beamtime at the I811 station of MAX-lab, synchrotron SOLEIL for providing the beamtime at ODE beamline, Dr. Ivo Zizak, Dr. Dirk Wallacher (HZB), Dr. S. Carlson and Dr. K. Sigfridsson (MAX IV) for support during the experiment. M.S. acknowledges the National Science Foundation (award DMR-1507233) for the financial support.
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Menushenkov, A.P., Yaroslavtsev, A.A., Geondzhian, A.Y. et al. Driving the Europium Valence State in EuCo2As2 by External and Internal Impact. J Supercond Nov Magn 30, 75–78 (2017). https://doi.org/10.1007/s10948-016-3771-0
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DOI: https://doi.org/10.1007/s10948-016-3771-0