Pressure-induced electronic mixing and enhancement of ferromagnetic ordering in EuX (X=Te, Se, S, O) magnetic semiconductors

Narcizo M. Souza-Neto, Daniel Haskel, Yuan-Chieh Tseng, Gerard Lapertot

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46 Scopus citations

Abstract

The pressure- and anion-dependent electronic structure of EuX (X=Te, Se, S, O) monochalcogenides is probed with element- and orbital-specific x-ray absorption spectroscopy in a diamond anvil cell. An isotropic lattice contraction enhances the ferromagnetic ordering temperature by inducing mixing of Eu 4f and 5d electronic orbitals. Anion substitution (Te→O) enhances competing exchange pathways through spin-polarized anion p states, counteracting the effect of the concomitant lattice contraction. The results have strong implications for efforts aimed at enhancing FM exchange interactions in thin films through interfacial strain or chemical substitutions.

Original languageEnglish
Article number057206
JournalPhysical Review Letters
Volume102
Issue number5
DOIs
StatePublished - 2 Feb 2009

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