More exact results on a binary alloy with next nearest neighbor competing interactions

Paraskevaidis, CE; Haroni, AA

dc.contributor.author	Paraskevaidis, CE	en
dc.contributor.author	Haroni, AA	en
dc.date.accessioned	2014-03-01T01:50:01Z
dc.date.available	2014-03-01T01:50:01Z
dc.date.issued	2000	en
dc.identifier.issn	0370-1972	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25983
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	ISING-MODEL	en
dc.subject.other	CAYLEY TREE	en
dc.subject.other	FIELD	en
dc.title	More exact results on a binary alloy with next nearest neighbor competing interactions	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	We study an Ising-type binary alloy with competing interactions between first and second neighbors on a Bethe lattice, Successive layers of the Bethe lattice are occupied in an alternating fashion by magnetic moments of type (A) and (B). We impose a restriction on the system by allowing only interlayer interactions between second neighbors. We approach the problem by setting up an iteration process for the partial partition functions. This correlates the partition function for a Bethe lattice with N layers to the partial partition functions of:the Bethe lattice with N - 1 layers. The presence of competing interactions between first and second neighbors imposes frustration on these systems, which, in turn, enriches the resulting phase diagrams. We study the behavior of the system for varying degrees of competition:between first and second neighbors. Besides the ferromagnetic (F) and paramagnetic (PM) phases, a-modulated ferromagnetic phase (F') with periodicity two and an antiferromagnetic phase with periodicity four (AF-2) are present, The modulated phase (M) is present only for cases of very strong competition between first and second neighbor interactions. As the competition is reduced, the modulated phase (M) disappears, For weak competition, two new phases with periodicity four appear:Tn the first one, labeled (+++-), magnetic moments of one species align ferromagnetically, while those of the other species align antiferromagnetically. in the second phase, (++++), both species align in a ferromagnetic fashion.	en
heal.publisher	WILEY-V C H VERLAG GMBH	en
heal.journalName	PHYSICA STATUS SOLIDI B-BASIC RESEARCH	en
dc.identifier.isi	ISI:000085576800027	en
dc.identifier.volume	217	en
dc.identifier.issue	2	en
dc.identifier.spage	963	en
dc.identifier.epage	973	en