Charge ordering in a pure spin model: dipolar spin ice

We study the dipolar spin-ice model at fixed density of single excitations, ρ, using a Monte Carlo algorithm where processes of creation and annihilation of such excitations are banned. In the limit of ρ going to zero, this model coincides with the usual dipolar spin-ice model at low temperatures, w...

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Detalles Bibliográficos
Autores principales: Borzi, Rodolfo Alberto, Slobinsky, Demian Gustavo, Grigera, Santiago Andrés
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Exactas
Física
dipolar spin-ice model
pure spin model
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126345
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.147204
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126345
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
dipolar spin-ice model
pure spin model
spellingShingle Ciencias Exactas
Física
dipolar spin-ice model
pure spin model
Borzi, Rodolfo Alberto
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
Charge ordering in a pure spin model: dipolar spin ice
topic_facet Ciencias Exactas
Física
dipolar spin-ice model
pure spin model
description We study the dipolar spin-ice model at fixed density of single excitations, ρ, using a Monte Carlo algorithm where processes of creation and annihilation of such excitations are banned. In the limit of ρ going to zero, this model coincides with the usual dipolar spin-ice model at low temperatures, with the additional advantage that a negligible number of monopoles allows for equilibration even at the lowest temperatures. Thus, the transition to the ordered fundamental state found by Melko, den Hertog, and Gingras in 2001 is reached using simple local spin flip dynamics. As the density is increased, the monopolar nature of the excitations becomes apparent: the system shows a rich ρ vs T phase diagram with "charge" ordering transitions analogous to that observed for Coulomb charges in lattices. A further layer of complexity is revealed by the existence of order both within the charges and their associated vacuum, which can only be described in terms of spins--the true microscopic degrees of freedom of the system.
format Articulo
Articulo
author Borzi, Rodolfo Alberto
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
author_facet Borzi, Rodolfo Alberto
Slobinsky, Demian Gustavo
Grigera, Santiago Andrés
author_sort Borzi, Rodolfo Alberto
title Charge ordering in a pure spin model: dipolar spin ice
title_short Charge ordering in a pure spin model: dipolar spin ice
title_full Charge ordering in a pure spin model: dipolar spin ice
title_fullStr Charge ordering in a pure spin model: dipolar spin ice
title_full_unstemmed Charge ordering in a pure spin model: dipolar spin ice
title_sort charge ordering in a pure spin model: dipolar spin ice
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/126345
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.147204
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AT grigerasantiagoandres chargeorderinginapurespinmodeldipolarspinice
bdutipo_str Repositorios
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