Magnetic properties of an isolated missing link in the anisotropic two-dimensional Heisenberg antiferromagnet

Journal Article · Sat May 15 04:00:00 EDT 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.352540· OSTI ID:6870088

Haas, S ^[1]

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1. Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306 (United States)

We consider an isolated missing link in an anisotropic Heisenberg antiferromagnet of spin [ital S] and coupling constants [ital J][sub [ital z]][ge][ital J][sub [ital xy]] on a square lattice. The interplay between longitudinal terms, involving [ital S][sub [ital z]], and transverse terms, representing the quantum fluctuations, of the Hamiltonian is investigated. Within the linearized spin-wave approximation (LSWA), we find that the local magnetic moment is slightly enhanced at the sites adjacent to the impurity link. It is also shown that quantum fluctuations on neighboring sites are drastically reduced in the vicinity of the impurity. Using perturbation theory we argue that the longitudinal zero-temperature susceptibility ([chi][sub [parallel]]) vanishes up to [ital O]([ital h][sub [ital z]][sup 4]). The static transversal susceptibility [[chi][sub [perpendicular]] ([ital T]=0)] is obtained within the LSWA, and is shown to be enhanced due to the defect.

• DOE Contract Number: FG05-91ER45443
• OSTI ID: 6870088
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 73:10; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
ANTIFERROMAGNETISM
CRYSTAL DEFECTS
CRYSTAL MODELS
CRYSTAL STRUCTURE
EXCHANGE INTERACTIONS
FLUCTUATIONS
INTERACTIONS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MATHEMATICAL MODELS
PERTURBATION THEORY
PHYSICAL PROPERTIES
SPIN WAVES
TWO-DIMENSIONAL CALCULATIONS
VARIATIONS