Multiferroic behavior confined by symmetry in EuTiO3 films

Autor:	Ryan, P. J., Sterbinsky, G. E., Choi, Y., Woicik, J. C., Zhu, Leyi, Jiang, J. S., Lee, J-H., Schlom, D. G., Birol, T., Brown, S. D., Thompson, P. B. J., Normile, P. S., Lang, J., Kim, J. -W.
Rok vydání:	2020
Předmět:	Condensed Matter - Materials Science Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. B 101, 180409 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.101.180409
Popis:	We have elucidated the spin, lattice, charge and orbital coupling mechanism underlying the multiferroic character in tensile strained EuTiO3 films. Symmetry determined by oxygen octahedral tilting shapes the hybridization between the Eu 4f and Ti 3d orbitals and this inhibits predicted Ti displacement proper ferroelectricity. Instead, phonon softening emerges at low temperatures within the pseudo-cube (110) plane, orthogonal to the anticipated ferroelectric polarization symmetry. Additionally, the magnetic anisotropy is determined by orbital distortion through hybridization between the Ti 3d and typically isotropic Eu2+ 4f. This unique scenario demonstrates the critical role symmetry plays in the coupling of order parameters defining multiferroic behaviour. Comment: 11 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2002.01996 Zobrazit plný text záznamu View this record from Arxiv