Mostrar el registro sencillo del ítem
Spin-glass phase transition and behavior of nonlinear susceptibility in the Sherrington-Kirkpatrick model with random fields
dc.contributor.author | Morais Junior, Carlos Alberto Vaz de | pt_BR |
dc.contributor.author | Zimmer, Fábio Mallmann | pt_BR |
dc.contributor.author | Lazo, Matheus Jatkoske | pt_BR |
dc.contributor.author | Magalhães, Sergio Garcia | pt_BR |
dc.contributor.author | Nobre, Fernando Dantas | pt_BR |
dc.date.accessioned | 2016-12-31T02:21:35Z | pt_BR |
dc.date.issued | 2016 | pt_BR |
dc.identifier.issn | 0163-1829 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/150383 | pt_BR |
dc.description.abstract | The behavior of the nonlinear susceptibility χ3 and its relation to the spin-glass transition temperature Tf in the presence of random fields are investigated. To accomplish this task, the Sherrington-Kirkpatrick model is studied through the replica formalism, within a one-step replica-symmetry-breaking procedure. In addition, the dependence of the Almeida-Thouless eigenvalue λAT (replicon) on the random fields is analyzed. Particularly, in the absence of random fields, the temperature Tf can be traced by a divergence in the spin-glass susceptibility χSG, which presents a term inversely proportional to the replicon λAT. As a result of a relation between χSG and χ3, the latter also presents a divergence at Tf , which comes as a direct consequence of λAT = 0 at Tf. However, our results show that, in the presence of random fields, χ3 presents a rounded maximum at a temperature T * which does not coincide with the spin-glass transition temperature Tf (i.e., T * > Tf for a given applied random field). Thus, the maximum value of χ3 at T * reflects the effects of the random fields in the paramagnetic phase instead of the nontrivial ergodicity breaking associated with the spin-glass phase transition. It is also shown that χ3 still maintains a dependence on the replicon λAT, although in a more complicated way as compared with the case without random fields. These results are discussed in view of recent observations in the LiHoxY1−xF4 compound. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. New York. Vol. 93, no. 22 (June 2016), 224206, 6 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Vidros de spin | pt_BR |
dc.subject | Transformações de fase | pt_BR |
dc.subject | Campos aleatórios | pt_BR |
dc.subject | Suscetibilidade magnética | pt_BR |
dc.title | Spin-glass phase transition and behavior of nonlinear susceptibility in the Sherrington-Kirkpatrick model with random fields | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001008287 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
Ficheros en el ítem
Este ítem está licenciado en la Creative Commons License
-
Artículos de Periódicos (39774)Ciencias Exactas y Naturales (6068)