Artículo
Entropy jump at the first-order vortex phase transition in Bi2Sr2CaCu2O8+δ with columnar defects
Rumi, G.; Albornoz, Lucas Javier
; Pedrazzini, Pablo
; Dolz, Moira Ines
; Pastoriza, Hernan
; Van Der Beek, Cornelis Jacominus; Konczykowski, M.; Fasano, Yanina
Fecha de publicación:
06/2019
Editorial:
Elsevier
Revista:
Materials Today: Proceedings
ISSN:
2214-7853
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We study the entropy jump associated with the first-order vortex melting transition (FOT) in Bi2Sr2CaCu2O8+δ crystals by means of Hall probe magnetometry. The samples present a diluted distribution of columnar defects (CD) introduced by irradiation with Xe ions. The FOT is detected in ac transmittivity measurements as a paramagnetic peak, the height of which is proportional to the enthalpy difference entailed by the transition. By applying the Clausius-Clapeyron relation, we quantify the evolution of the entropy jump Δs as a function of the FOT temperature, TFOT, in both pristine crystals and crystals with CD. On increasing the density of CD, Δs decreases monotonically with respect to values found in pristine samples. The Δs versus TFOT dependence in the case of pristine samples follows reasonably well the theoretical prediction of dominant electromagnetic coupling for a model neglecting the effect of disorder. The data for samples with a diluted distribution of CD are not properly described by such a theoretical model.
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Articulos (UE-INN - NODO BARILOCHE)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Citación
Rumi, G.; Albornoz, Lucas Javier; Pedrazzini, Pablo; Dolz, Moira Ines; Pastoriza, Hernan; et al.; Entropy jump at the first-order vortex phase transition in Bi2Sr2CaCu2O8+δ with columnar defects; Elsevier; Materials Today: Proceedings; 14; 6-2019; 30-33
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