Resistivity vs. temperature measurements on La0.7Ca0.3MnO3/YBa2Cu3O7-delta /La0.7Ca0.3MnO3 (LCMO/YBCO/LCMO) trilayers with different YBCO thickness, were performed in external magnetic field H up to 8 T. By evaluating the activation energy U from the slope of the resistivity Arrhenius plot, a strong depression of U has been observed when decreasing the YBCO layer thickness and the absolute U values appear to be reduced with respect to the values reported in literature in the case of YBCO thin films and YBCO/insulating multilayers. Moreover, a logarithmic U vs. H dependence is shown both in the case of thick and thin YBCO layers indicating the formation of a two dimensional vortex lattice. The experimental data are discussed considering the strong influence of the ferromagnetic LCMO on the superconducting YBCO properties which reduces the effective YBCO thickness more than predicted by the conventional theories.

Salvato, M., Bobba, F., Calabrese, G., Cirillo, C., Cucolo, A.m., De_santis, A., et al. (2006). Activation energy in La0.7Ca0.3MnO3/YBa2Cu3O7-delta/La0.7Ca0.3MnO3 superconducting trilayers. THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS, 51(1), 79-85 [10.1140/epjb/e2006-00200-4].

Activation energy in La0.7Ca0.3MnO3/YBa2Cu3O7-delta/La0.7Ca0.3MnO3 superconducting trilayers

SALVATO, MATTEO;
2006-01-01

Abstract

Resistivity vs. temperature measurements on La0.7Ca0.3MnO3/YBa2Cu3O7-delta /La0.7Ca0.3MnO3 (LCMO/YBCO/LCMO) trilayers with different YBCO thickness, were performed in external magnetic field H up to 8 T. By evaluating the activation energy U from the slope of the resistivity Arrhenius plot, a strong depression of U has been observed when decreasing the YBCO layer thickness and the absolute U values appear to be reduced with respect to the values reported in literature in the case of YBCO thin films and YBCO/insulating multilayers. Moreover, a logarithmic U vs. H dependence is shown both in the case of thick and thin YBCO layers indicating the formation of a two dimensional vortex lattice. The experimental data are discussed considering the strong influence of the ferromagnetic LCMO on the superconducting YBCO properties which reduces the effective YBCO thickness more than predicted by the conventional theories.
2006
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Activation energy; Electric conductivity; Lanthanum compounds; Magnetic field effects; Multilayers; Thickness measurement; External magnetic field; Insulating multilayers; Layer thickness; Superconducting trilayers; Superconducting films
Salvato, M., Bobba, F., Calabrese, G., Cirillo, C., Cucolo, A.m., De_santis, A., et al. (2006). Activation energy in La0.7Ca0.3MnO3/YBa2Cu3O7-delta/La0.7Ca0.3MnO3 superconducting trilayers. THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS, 51(1), 79-85 [10.1140/epjb/e2006-00200-4].
Salvato, M; Bobba, F; Calabrese, G; Cirillo, C; Cucolo, Am; De_santis, A; Vecchione, A; Attanasio, C
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
EPJB51-79.pdf

accesso aperto

Licenza: Creative commons
Dimensione 728.59 kB
Formato Adobe PDF
728.59 kB Adobe PDF Visualizza/Apri

Questo articolo è pubblicato sotto una Licenza Licenza Creative Commons Creative Commons

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/38058
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 7
social impact