Ferromagnetism in one dimension: Critical temperature

Article

关键词: CRITICAL-BEHAVIOR;    PHASE-TRANSITIONS;    RANGE;    SUMMATION;    SYSTEMS;    MODELS;    FIELDS;   

DOI  :  10.1103/PhysRevB.72.224410

来源: SCIE

【 摘 要 】

Ferromagnetism in one dimension is a observation which has been reported in a recent work [Gambardella , Nature (London) 416, 301 (2002)], and it is thought that anisotropy barriers are responsible in that relevant effect. In the present work, transitions between two different magnetic ordering phases are obtained as a result of an alternative approach. The critical temperature has been estimated by the Binder method. Ferromagnetic long-range interactions have been included in a special Hamiltonian through a power law that decays at large interparticle distance r as r(-alpha) for alpha >= 0. If the range of interactions decreases (alpha ->infinity), the trend of the critical temperature disappears, but if the range of interactions increases (alpha -> 0), the trend of the critical temperature approaches to the mean field approximation. The crossover between these two limiting situations is discussed.

【 授权许可】

Free