Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101793
Title: Microscopic theory of electric polarization induced by skyrmionic order in GaV4 S8
Authors: Nikolaev, S. A.
Solovyev, I. V.
Issue Date: 2019
Publisher: American Physical Society
Citation: Nikolaev S. A. Microscopic theory of electric polarization induced by skyrmionic order in GaV4 S8 / S. A. Nikolaev, I. V. Solovyev. — DOI 10.1103/PhysRevB.99.100401 // Physical Review B. — 2019. — Vol. 99. — Iss. 10. — 100401.
Abstract: The lacunar spinel GaV4S8 was recently suggested to be a prototype multiferroic material hosting skyrmion lattice states with a sizable polarization P coupled to magnetic order. We explain this phenomenon on the microscopic level. On the basis of density functional theory, we construct an effective model describing the behavior of magnetically active electrons in a weakly coupled lattice formed by molecular orbitals of the (V4S4)5+ clusters. By applying superexchange theory combined with the Berry-phase theory for P, we derive a compass model relating the energy and polarization change with the directions of spins ei in magnetic bonds. We argue that, although each skyrmion layer is mainly formed by superexchange interactions in the same plane, the spin dependence of P arises from the stacking misalignment of such planes in the perpendicular direction, which is inherent to the lacunar spinel structure. We predict a strong competition of isotropic, ∼eiej, and antisymmetric, ∼ei×ej, contributions to P that explains the experimentally observed effect. © 2019 American Physical Society.
Keywords: BINARY ALLOYS
LATTICE THEORY
MOLECULAR ORBITALS
POLARIZATION
ELECTRIC POLARIZATION
MAGNETICALLY ACTIVES
MICROSCOPIC LEVELS
MICROSCOPIC THEORY
MULTIFERROIC MATERIALS
SKYRMION LATTICES
SPINEL STRUCTURE
SUPEREXCHANGE INTERACTION
DENSITY FUNCTIONAL THEORY
URI: http://hdl.handle.net/10995/101793
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85062722174
PURE ID: 9177907
4099c127-b0d0-41f3-872e-06a255d960cf
ISSN: 24699950
DOI: 10.1103/PhysRevB.99.100401
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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