Pressure-tuning of the electronic and magnetic properties of EuPt2Si2

• Published in: Journal of magnetism and magnetic materials Vol. 560; p. 169619
• Main Authors: dos Reis, R.D., Veiga, L.S.I., Fabbris, G., Garcia, F., Haskel, D., Gandra, F.C.G., Souza-Neto, N.M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 15.10.2022; Elsevier
• Subjects: Ferromagnetism collapse; MATERIALS SCIENCE; Tuning Electronic properties; Valence change; X-ray spectroscopy; Valence change; X-ray spectroscopy; Tuning Electronic properties; Ferromagnetism collapse
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.169619

Using the element and orbital selectivity of x-ray absorption spectroscopy at Eu and Pt L3 edges we investigate the effects of the lattice contraction, induced by temperature and external pressure, on the magnetic and electronic properties of the EuPt2Si2 system. Our findings point to a clear relationship between the volume and the Eu valence in this material. From XANES experiments as a function of pressure we show that the Europium valence tends to stabilize at 3+ for pressures up to 27 GPa. The XMCD results demonstrate that pressure induced valence change of the Europium ion leads to a suppression of the magnetic ordering of the material. Altogether our results provide direct evidence that Eu-4f/5d electronic hybridization effects underlie the mechanism that regulates the valence and magnetic ordering in this material. •EuPt2Si2 has an unstable valence which is directly related to the unit cell lattice parameters.•Both temperature decrease and pressure increase induces a continuous Europium valence change from 2+ to 3+.•The valence changes lead to the increase of charge carriers on the material.•Eu charges are transferred to the conduction band when the lattice is compressed.•High pressure induces a collapse of the ferromagnetic ordering of the material.