Microscopic mechanisms of spin-dependent electric polarization in 3d oxides / Moskvin A. S.,Drechsler S. -L. // PHYSICAL REVIEW B. - 2008. - V. 78, l. 2.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

We address a systematic microscopic theory of spin-dependent electric polarization in 3d oxides starting with a generic three-site two-hole cluster. A perturbation scheme realistic for 3d oxides is applied which implies the quenching of orbital moments by low-symmetry crystal field, strong intra-atomic correlations, the dp-transfer effects, and rather small spin-orbital coupling. An effective spin operator of the electric-dipole moment is deduced incorporating both nonrelativistic proportional to((s) over cap (1)center dot(s) over cap (2)) and relativistic proportional to{[}s(1)xs(2)] terms. The nonrelativistic electronic polarization mechanism related to the effects of the redistribution of the local on-site charge density due to pd covalency and exchange coupling is believed to govern the multiferroic behavior in 3d oxides. The relativistic exchange-dipole moment is mainly stems from the nonrelativistic one due to the perturbation effect of Dzyaloshinsky-Moriya coupling and is estimated to be a weak contributor to the electric polarization observed in the most of 3d multiferroics.

Author keywords:

ANISOTROPIC SUPEREXCHANGE INTERACTION; ATOMIC SCREENING CONSTANTS; SCF FUNCTIONS; ORBIT; FERROELECTRICITY; ENERGY

DOI:

10.1103/PhysRevB.78.024102

Web of Science ID:

ISI:000258190200029

Соавторы в МНС:

—

Другие поля

Поле	Значение
Month	JUL
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	024102
Keywords-Plus	ANISOTROPIC SUPEREXCHANGE INTERACTION; ATOMIC SCREENING CONSTANTS; SCF FUNCTIONS; ORBIT; FERROELECTRICITY; ENERGY
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Number-of-Cited-References	62
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	11
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	333YT