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Comparison of Flux Pinning Mechanism in Laser Ablated YBCO and YBCO:BaZrO3 Nanocomposite Thin Films

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Title Comparison of Flux Pinning Mechanism in Laser Ablated YBCO and YBCO:BaZrO3 Nanocomposite Thin Films
 
Creator JHA, AK
KHARE, N
PINTO, R
 
Subject YBCO
Nanocomposite
Critical currents
Vortex pinning
CRITICAL CURRENTS
YBA2CU3O7-DELTA FILMS
SUPERCONDUCTOR
NANOPARTICLES
DEFECTS
 
Description Thin films of YBCO and YBCO:BaZrO3 (BZO) nanocomposite have been deposited using the pulsed laser deposition technique. Substantial increase in critical current density (J (C) ) and pinning force density (F (p) ) of the nanocomposite thin films was observed. The possible pinning mechanism in YBCO:BZO nanocomposite thin films has been explored and compared with the pinning mechanism in pure YBCO thin film by studying the variation of J (C) with magnetic field (B) and temperature. In the intermediate field regime (0.1-1 T), J (C) follows B (-alpha) with nearly similar values of alpha for YBCO and YBCO:BZO nanocomposite thin films indicating similar pinning mechanism in both thin films. The variation of J (C) with reduced temperature (t=T/T (C) ) has been studied for both the films and it was observed that the mechanism of pinning in both YBCO and YBCO:BZO thin films is similar (delta T (C) pinning). The observed enhanced values of J (C) and F (p) of the nanocomposite thin film is attributed to the presence of BZO nanoparticles, which induces more defects due to lattice mismatch between YBCO and BZO leading to improved flux pinning properties of the nanocomposite thin film.
 
Publisher SPRINGER
 
Date 2014-10-16T12:34:36Z
2014-10-16T12:34:36Z
2012
 
Type Article
 
Identifier JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 25(2)377-380
http://dx.doi.org/10.1007/s10948-011-1321-3
http://dspace.library.iitb.ac.in/jspui/handle/100/15559
 
Language en