Entropy jump at the first-order vortex phase transition in Bi2Sr2CaCu2O8+δ with columnar defects
| Autor: | M. I. Dolz, G. Rumi, Marcin Konczykowski, Pablo Pedrazzini, H. Pastoriza, L. J. Albornoz, C. J. van der Beek, Yanina Fasano |
|---|---|
| Přispěvatelé: | Laboratorio de Bajas Temperaturas (LBT), Consejo Nacional de Investigaciones Científicas y Técnicas., Laboratoire des Solides Irradiés (LSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Department of Condensed Matter Physics, Université de Genève = University of Geneva (UNIGE), University of Geneva [Switzerland] |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Phase transition Materials science High-temperature superconductivity Condensed matter physics Enthalpy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vortex Ion law.invention [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] Paramagnetism law Condensed Matter::Superconductivity 0103 physical sciences Jump Irradiation 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Materials Today: Proceedings Materials Today: Proceedings, 2019, 14, pp.30-33. ⟨10.1016/j.matpr.2019.05.046⟩ Materials Today: Proceedings, Elsevier, 2019, 14, pp.30-33. ⟨10.1016/j.matpr.2019.05.046⟩ |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2019.05.046 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect