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http://hdl.handle.net/10400.21/5912
Título: | Low temperature structural transitions in dipolar hard spheres: the influence on magnetic properties |
Autor: | Ivanov, A.O. Kantorovich, Sofia S. Rovigatti, Lorenzo Tavares, Jose SCIORTINO, Francesco |
Palavras-chave: | Initial magnetic susceptibility Low temperature Structural transition Dipolar hard spheres Chain Ring |
Data: | 1-Jun-2015 |
Editora: | Elsevier Science BV |
Citação: | IVANOV, A.O.; [et al.] - Low temperature structural transitions in dipolar hard spheres: the influence on magnetic properties. Journal of Magnetism and Magnetic Materials. ISSN.0304-8853. Vol. 383 (2015), pp. 272-276 |
Resumo: | We investigate the structural chain-to-ring transition at low temperature in a gas of dipolar hard spheres (DRS). Due to the weakening of entropic contribution, ring formation becomes noticeable when the effective dipole-dipole magnetic interaction increases, It results in the redistribution of particles from usually observed flexible chains into flexible rings. The concentration (rho) of DI-IS plays a crucial part in this transition: at a very low rho only chains and rings are observed, whereas even a slight increase of the volume fraction leads to the formation of branched or defect structures. As a result, the fraction of DHS aggregated in defect-free rings turns out to be a non-monotonic function of rho. The average ring size is found to be a slower increasing function of rho when compared Lo that of chains. Both theory and computer simulations confirm the dramatic influence of the ring formation on the rho-dependence of the initial magnetic susceptibility (chi) when the temperature decreases. The rings clue to their zero total dipole moment are irresponsive to a weak magnetic field and drive to the strong decrease of the initial magnetic susceptibility. (C) 2014 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10400.21/5912 |
DOI: | 10.1016/j.jmmm.2014.10.013 |
ISSN: | 0304-8853 1873-4766 |
Versão do Editor: | http://www.sciencedirect.com/science/article/pii/S0304885314009123 |
Aparece nas colecções: | ISEL - Física - Artigos |
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Low temperature structural transitions in dipolar hard spheres the influence on magnetic properties.pdf | 599,23 kB | Adobe PDF | Ver/Abrir Acesso Restrito. Solicitar cópia ao autor! |
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