Universität zu Köln

Wollny, Alexander, Fritz, Lars and Vojta, Matthias ORCID: 0000-0002-5740-831X (2011). Fractional Impurity Moments in Two-Dimensional Noncollinear Magnets. Phys. Rev. Lett., 107 (13). COLLEGE PK: AMER PHYSICAL SOC. ISSN 0031-9007

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Abstract

We study dilute magnetic impurities and vacancies in two-dimensional frustrated magnets with noncollinear order. Taking the triangular-lattice Heisenberg model as an example, we use quasiclassical methods to determine the impurity contributions to the magnetization and susceptibility. Most importantly, each impurity moment is not quantized but receives nonuniversal screening corrections due to local relief of frustration. At finite temperatures, where bulk long-range order is absent, this implies an impurity-induced magnetic response of Curie form, with a prefactor corresponding to a fractional moment per impurity. We also discuss the behavior in an applied magnetic field, where we find a singular linear-response limit for overcompensated impurities.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wollny, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Fritz, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED Vojta, Matthias UNSPECIFIED orcid.org/0000-0002-5740-831X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-488938
DOI:	10.1103/PhysRevLett.107.137204
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	107
Number:	13
Date:	2011
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	0031-9007
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HEISENBERG-ANTIFERROMAGNET; TRIANGULAR LATTICE; FIELD Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48893