Magnetism tailored by mechanical strain engineering in PrVO 3 thin films

D. Kumar (1) , A. David (1) , A. Fouchet (1) , A. Pautrat (1) , J. Varignon (2) , C. Jung (3) , U. Lüders (1) , B. Domengès (1) , O. Copie (4) , P. Ghosez (2) , Wilfrid Prellier (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 Université de Liège
3 HUFS - Hankuk University of Foreign Studies
4 IJL - Institut Jean Lamour

Transition-metal oxides with an ABO 3 perovskite structure exhibit strongly entangled structural and electronic degrees of freedom and thus one expects to unveil exotic phases and properties by acting on the lattice through various external stimuli. Using the Jahn-Teller active praseodymium vanadate Pr 3+ V 3+ O 3 compound as a model system, we show that PrVO 3 Néel temperature T N can be raised by 40 K with respect to the bulk when grown as thin films. Using advanced experimental techniques, this enhancement is unambiguously ascribed to a tetragonality resulting from the epitaxial compressive strain experienced by the films. First-principles simulations not only confirm experimental results, but they also reveal that the strain promotes an unprecedented orbital ordering of the V 3+ d electrons, strongly favoring antiferromagnetic interactions. These results show that an accurate control of structural aspects of oxides is the key for unveiling unexpected phases in oxides.

Mots clés: Antiferromagnetism; Electronic structure; Epitaxial strain; First-principles calculations; Spin-orbit coupling; Thin films; Transition metal oxides; Atomic force microscopy; Density functional calculations; Magnetization measurements; Resistivity measurements; Transmission electron microscopy; Antiferromagnetism; Antiferromagnetism; Antiferromagnetism

Domaines: Matériaux; Chimie; Physique [physics]

D. Kumar, A. David, A. Fouchet, A. Pautrat, J. Varignon, et al.. Magnetism tailored by mechanical strain engineering in PrVO 3 thin films. Physical Review B, 2019, 99 (22), pp.224405. ⟨10.1103/PhysRevB.99.224405⟩. ⟨hal-03014268⟩