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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4430

Title: Pulsed laser ablation: A new route to synthesize novel superconducting compounds as oriented films
Authors: GNANASEKAR, KI
SHARON, M
PINTO, R
PAI, SP
RAO, MSR
APTE, PR
TAMHANE, AS
PURANDARE, SC
GUPTA, LC
VIJAYARAGHAVAN, R
Keywords: normal-state properties
high-tc superconductors
thin-films
(gd1-xprx)ba2cu3o7-delta system
neutron-diffraction
crystal-structure
critical currents
= y
pr
yba2cu3o7-x
Issue Date: 1996
Publisher: AMER INST PHYSICS
Citation: JOURNAL OF APPLIED PHYSICS, 79(2), 1082-1091
Abstract: We report here the significance of the pulsed laser ablation technique in stabilizing strained lattices that do not form by the conventional ceramic method and show that the technique offers unique possibilities to probe the structure property relationship in complicated systems. One of such systems is LuBa2Cu3O7-delta a systematic investigation of structural (in)stability of its superconducting phase is presented here. Our analysis suggests that the system suffers from internal strain due to lower ionic radius of LU(3+); however, the structure can be stabilized only as oriented films on [100] LaAlO3, [100] SrTiO3, and [100] MgO, with excellent superconducting properties (J(c) approximate to 5.0x10(6) A cm(-2) at 77 K). We have also investigated similar compounds having their stability close to their crystallographic limit. The important feature of these metastable phases is that they grow only as oriented films. Free energy of epitaxial growth of strained films are investigated and a simple growth model is proposed based on our observation. Importance of this growth model in explaining the superconductor-normal-metal-superconductor type of junctions, observed in high-T-c superconductors is highlighted. (C) 1996
URI: http://dx.doi.org/10.1063/1.360898
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4430
http://hdl.handle.net/10054/4430
ISSN: 0021-8979
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