Anomalous spin-wave excitations in a one-dimensional Dzyaloshinski--Moriya antiferromagnet

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345856· OSTI ID:7186344

Xia, Q; Riseborough, P S ^[1]

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1. Physics Department, Polytechnic University, 333 Jay Street, Brooklyn, New York 11201 (USA)

The dynamics of a one-dimensional Heisenberg antiferromagnet with a small Dzyaloshinski--Moriya component to the exchange interaction is considered. The spin rotational invariance within the easy plane is broken by the application of a weak magnetic field in the easy plane. The nature of the spin-wave excitations of the quantum spin system is investigated, and pronounced anomalies in the single-spin-wave spectrum at fields comparable to the anisotropy in the exchange interaction are found. These anomalies are of quantum character and are related to the resonance between the single-spin-wave and the two-spin-wave excitations. The implications for the two-spin-wave bound states are discussed.

• DOE Contract Number: FG02-84ER45127
• OSTI ID: 7186344
• Journal Information: Journal of Applied Physics; (USA), Vol. 67:9; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
HEISENBERG MODEL
SPIN WAVES
DYNAMICS
EXCHANGE INTERACTIONS
INVARIANCE PRINCIPLES
MAGNETIC FIELDS
ONE-DIMENSIONAL CALCULATIONS
SPIN
ANGULAR MOMENTUM
CRYSTAL MODELS
INTERACTIONS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
PARTICLE PROPERTIES
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)