Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects / Moskvin A. S. // JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - 2007. - V. 104, l. 6. - P. 913-927.

ISSN/EISSN:

1063-7761 / нет данных

Type:

Article

Abstract:

We reconsider the conventional Moriya approach to the Dzyaloshinsky-Moriya antisymmetric exchange coupling for a single Cu-1-O-Cu-2 bond in cuprates using a perturbation scheme that provides an optimal way to account for intra-atomic electron correlations, low-symmetry crystal field, and local spin-orbital contributions with a focus on the oxygen term. The Dzyaloshinsky vector and the corresponding weak ferromagnetic moment are shown to be a superposition of comparable and, sometimes, competing local Cu and O contributions. We predict the effect of oxygen staggered spin polarization in the antiferromagnetic edge-shared CuO2 chains due to the uncompensated oxygen Dzyaloshinsky vectors. The polarization is perpendicular to both the main chain antiferromagnetic vector and the CuO2 chain normal. The intermediate O-17 NMR is shown to be an effective tool to inspect the effects of Dzyaloshinsky-Moriya coupling in an external magnetic field. In particular, we argue that the puzzling planar O-17 Knight shift anomalies observed in the paramagnetic phase of the generic Dzyaloshinsky-Moriya antiferromagnetic cuprate La2CuO4 can be assigned to the effect of the field-induced staggered magnetization. Finally, we revisit the effects of symmetric spin anisotropy, in particular, those directly induced by the Dzyaloshinsky-Moriya coupling. The perturbation scheme generalizes the well-known Moriya approach and presents a basis for reliable quantitative estimates for the symmetric partner of the Dzyaloshinsky-Moriya coupling. In contrast to the conventional standpoint, the parameters of the effective two-ion spin anisotropy are shown to incorporate the contributions of a single-ion anisotropy for two-hole configurations at both Cu and O sites.

Author keywords:

ANISOTROPIC SUPEREXCHANGE INTERACTION; FIELD-INDUCED GAP; WEAK FERROMAGNETISM; FRUSTRATION; LA2CUO4; BOND

DOI:

10.1134/S106377610706009X

Web of Science ID:

ISI:000248052000009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	ANISOTROPIC SUPEREXCHANGE INTERACTION; FIELD-INDUCED GAP; WEAK FERROMAGNETISM; FRUSTRATION; LA2CUO4; BOND
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
Author-Email	alexandr.moskvin@usu.ru
Number-of-Cited-References	39
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	10
Journal-ISO	J. Exp. Theor. Phys.
Doc-Delivery-Number	190IH