Open AccessHigh-pressure tuning of valence and magnetic interactions in Eu0.5 0.5 4
Author(s) -
G.D. Loula,
R. D. dos Reis,
D. Haskel,
F. García,
N. M. Souza-Neto,
F. C. G. Gandra
Publication year - 2012
Publication title -
physical review. b, condensed matter and materials physics
Language(s) - English
Resource type - Journals
eISSN - 1538-4489
pISSN - 1098-0121
DOI - 10.1103/physrevb.85.245128
Subject(s) - valence (chemistry) , antiferromagnetism , condensed matter physics , materials science , atomic orbital , ferromagnetism , physics , electron , quantum mechanics
Pressure-induced changes in valence and magnetic ordering are observed in a Eu 0.5Yb 0.5Ga 4 compound by means of element selective x-ray absorption spectroscopy at Eu and Yb L 3 edges. Concomitant Eu and Yb valence transitions towards a 3+ state, together with an antiferromagnetic to ferromagnetic transition, are observed with applied pressures up to 30 GPa. With the support of density functional theory calculations, we argue that hybridization between (Eu/Yb)-5d and Ga orbitals regulates the valence and magnetic exchange interactions in this system. © 2012 American Physical Society