DAMPING OF MAGNONS IN A 2-DIMENSIONAL S=1 2 HEISENBERG-ANTIFERROMAGNET/

Authors
BARABANOV AF MAKSIMOV LA
Citation
Af. Barabanov et La. Maksimov, DAMPING OF MAGNONS IN A 2-DIMENSIONAL S=1 2 HEISENBERG-ANTIFERROMAGNET/, Physics letters. A, 207(6), 1995, pp. 390-396
Citations number
12
Categorie Soggetti
Physics
Journal title
Physics letters. A → ACNP
ISSN journal
03759601
Volume
207
Issue
6
Year of publication
1995
Pages
390 - 396
Database
ISI
SICI code
0375-9601(1995)207:6<390:DOMIA2>2.0.ZU;2-1
Abstract
The spin excitation damping is examined for a singlet state of a 2D an tiferromagnet on a square lattice using the rotationally invariant app roach for two-time spin Green functions. It is shown that the lowest b oundary of weakly damped spin waves has a scale k of the order (T/T-0) (3/2). This leads to an inverse correlation L(-1) which is much larger than L(0)(-1) similar to exp(T-0/T) given by the Dyson-Maleev formali sm.