Record Details

Title:
Pressure-induced electronic phase transition in compound EuCu$_2$Ge$_2$
Affiliation(s):
EuXFEL staff
Author group:
Instrument SCS
Topic:
Scientific area:
Abstract:
We report the high-pressure XANES study of the electronic phase transition from 4f$^7$ to 4f$^6$ configuration of europium in the rare-earth compound EuCu$_2$Ge$_2$. The hydrostatic pressure dependence of the europium valence was obtained in a wide pressure range (1-30 GPa) at room temperature. It was found that upon the pressure increase above 20 GPa the europium valence does not reach the integer value +3 but stabilizes at 2.87. The experimental results were supported by the band structure calculations in the framework of DFT, which allowed us to discuss the features of 3d-4f hybridization in this system. The study also compares the mechanisms of external and &quot;chemical&quot; pressure by the Si substitution in Ge site in series EuCu$_2$(Si$_x$Ge$_{1-x}$)$_2$.
Imprint:
2016
conference Information:
Journal of Physics: Conference Series, 712, 012112 (2016)
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Language(s):
English
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