Dc transport properties of high quality c-axis oriented superconducting SmBa2Cu3O7-x (Sm123) films have been investigated in order to understand the pinning mechanism in this material. The Sm123 films have been deposited on both (1 0 0) SrTiO3 and LaAlO 3 single-crystal substrates by a dc sputtering technique in high oxygen partial pressure. Structural characterization was carried out by means of X-ray analysis, scanning electron microscopy and atomic force microscopy. The electrical resistivity as a function of temperature of the as grown samples showed a metallic behavior in the normal state and a superconducting transition with Tc(ρ=0)=92 K and ΔTc<3 K. Critical current density measured at 77 K and in self-field was of the order of 10 6 A/cm2. The temperature dependence of the current-voltage (I-V) characteristics of the Sm123 films have been measured. The pinning properties have been analysed by examining the activation energy dependence on temperature and bias current density within a thermally activated vortex motion model. We found that experimental data are consistent with a logarithmic-like behavior of the pinning potential. © 2003 Elsevier B.V. All rights reserved.

DC transport properties of epitaxial superconducting SmBa2Cu3O7-x films

NIGRO, Angela;PACE, Sandro;CUCOLO, Anna Maria
2004-01-01

Abstract

Dc transport properties of high quality c-axis oriented superconducting SmBa2Cu3O7-x (Sm123) films have been investigated in order to understand the pinning mechanism in this material. The Sm123 films have been deposited on both (1 0 0) SrTiO3 and LaAlO 3 single-crystal substrates by a dc sputtering technique in high oxygen partial pressure. Structural characterization was carried out by means of X-ray analysis, scanning electron microscopy and atomic force microscopy. The electrical resistivity as a function of temperature of the as grown samples showed a metallic behavior in the normal state and a superconducting transition with Tc(ρ=0)=92 K and ΔTc<3 K. Critical current density measured at 77 K and in self-field was of the order of 10 6 A/cm2. The temperature dependence of the current-voltage (I-V) characteristics of the Sm123 films have been measured. The pinning properties have been analysed by examining the activation energy dependence on temperature and bias current density within a thermally activated vortex motion model. We found that experimental data are consistent with a logarithmic-like behavior of the pinning potential. © 2003 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/1065529
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