A model of two quantum fluids for the low energy excited states of the systems with entities that mimic the magnetic monopoles
López Aguilar, Fernando (Universitat Autònoma de Barcelona. Departament de Física)
López-Bara, Fernando (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2021
Resum:	The low energy excitation states in frustrated magnetic structures can generate quasiparticles that behave as if they were magnetic charges. These excited states produce, in the so-called spin-ice materials, two different peaks of specific heat at temperatures less than 1. 5 K. In this paper, we consider that the first structure is caused by the formation of fluid of magnetic dipoles configured by the dumbbell model with a boson nature in consonance with that described by Witten for mesons. The second structure, wider than the first one, corresponds to a plasma state that comes from the breaking of a great number of dipoles, which provokes the appearance of free magnetic charges, which constitute a cool magnetic plasma fluid. In this paper, we determine thermodynamic analytical functions: the thermo-potential and internal energy and their respective derivative physical magnitudes: entropy, and magnetic specific heat. We obtain results in a good concordance with the experimental data, which allow us to explain the phase transitions occurred in these spin-ice materials at very low temperatures.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Magnetic monopoles ; Phase transitions ; Magnetic plasma ; Pseudospin model ; Thermodynamic ; Statistic physics
Publicat a:	Fluids, Vol. 6, Issue 9 (September 2021) , art. 324, ISSN 2311-5521

DOI: 10.3390/fluids6090324

14 p, 16.3 MB

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