Two fluid model in low energy excited states within spin-ice systems
López Bara, Fernando Ignacio (Universitat Autònoma de Barcelona. Departament de Física)
López Aguilar, Fernando (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2018
Resum:	Excitations in magnetic structures of the so-called spin-ice materials generate two diferent peaks in the specifc heat and anomalies in entropy in the temperature interval between 0 and 1K. These points are due to the existence of two low-energy excited global states which seem to transit from a bosonic condensate towards a magnetic neutral plasma in a narrow temperature interval between 0. 05≤T≤1K. In this paper, we determine the characteristic features of two states and we analyze the possibilities of existence of a BEC state and its phase transition to the magnetic plasma state from a model of two magnetic charge fuids. From the structural analysis of the many-body excitation states, we obtain theoretical results about entropy and specifc heat since these two key physical magnitudes announce the phase transitions. We give criteria for distinguishing if some of these phase transitions is of either frst or second order.
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
Publicat a:	Scientific reports, Vol. 8 (2018) , art. 16303, ISSN 2045-2322

DOI: 10.1038/s41598-018-34529-x
PMID: 30389992

13 p, 1.8 MB

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