Spin Waves in Random Spin Chains

Details Spin Waves in Random Spin Chains Spin Waves in Random Spin Chains

2002-08-30

arxiv.org/abs/cond-mat/0208607v1

J. Appl. Phys. 93, 7390 (2003).

Physics

Condensed Matter

Disordered Systems and Neural Networks

3 pages, 3 eps figures, submitted to the 47th Conference on Magnetism and Magnetic Materials

Scientific paper

10.1063/1.1541640

We study quantum spin-1/2 Heisenberg ferromagnetic chains with dilute, random antiferromagnetic impurity bonds with modified spin-wave theory. By describing thermal excitations in the language of spin waves, we successfully observe a low-temperature Curie susceptibility due to formation of large spin clusters first predicted by the real-space renormalization-group approach, as well as a crossover to a pure ferromagnetic spin chain behavior at intermediate and high temperatures. We compare our results of the modified spin-wave theory to quantum Monte Carlo simulations.

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