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Magnetic excitations and fluctuations in quasi-Heisenberg antiferromagnetic chains

✍ Scribed by L.P. Regnault; J. Rossat-Mignod; J.P. Renard; M. Verdaguer; C. Vettier

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
686 KB
Volume
156-157
Category
Article
ISSN
0921-4526

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✦ Synopsis

In this paper we review the experimental situation concerning magnetic fluctuations and excitations in quasi-Heisenberg antiferromagnetic (AF) chains, as observed in prototypes of the classical (TMMC), S = l/2 (CPC) and S = 1 (NENP, CsNiCI,) systems, by inelastic and quasielastic neutron scattering. Recent experimental results confirm the prediction by Haldane that quantum AF chains with an integer spin value would display at T = 0 a quite different behaviour than AF chains with a half-integer spin value.

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Collective and local excitations in diluted antiferromagnetic Heisenberg systems
✍ K Tanaka; K Fuchizaki πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 101 KB

The crossover behavior from collective to local spin motions in diluted antiferromagnets is discussed using the canonical molecular dynamics method without introducing any ad hoc approximations to the equations of motion. The calculated dynamic responses are compared with the recent results obtained