Comparison between continued-fraction and computer-simulation methods applied to a classical Heisenberg chain
- 1 March 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 19 (5) , 2585-2594
- https://doi.org/10.1103/physrevb.19.2585
Abstract
A detailed comparison between the simulation data of Heller and Blume, and various continued-fraction expansions, is presented. It is shown that the three-pole expansion is qualitatively wrong while four- and six-pole expansions are in good agreement with the simulation data. A possibility of using continued-fraction representations to interpret simulation results is discussed. The convergence of the various approximations in the frequency domain is investigated.Keywords
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