Spectral density approach to the one-dimensional classical Heisenberg ferromagnet with long-range interactions

被引：1
|
作者：
Cosenza, F
Cavallo, A
De Cesare, L
机构：
[1] Univ Salerno, Dipartimento Fis ER Caianiello, I-84081 Baronissi, SA, Italy
[2] Ist Nazl Fis Mat, Unita Salerno, Salerno, Italy
来源：
PHYSICS LETTERS A | 2003年 / 310卷 / 2-3期
关键词：
classical Heisenberg chain; long-range interactions;
D O I：
10.1016/S0375-9601(03)00290-1
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The thermodynamic properties of a classical spin-S Heisenberg ferromagnetic chain with long-range interactions decaying as r(-alpha) and in the presence of an external magnetic field, are investigated by means of the spectral density method. In particular, we find that long-range order exists at finite temperature for1 < 6 < 2, consistently with known theorems. Our results appear in a reasonable agreement with available exact ones and Monte Carlo calculations. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：223 / 228
页数：6
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