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Title: Effect of Cu-site occupancy on superconducting order parameter dimensionality and related correlations in low-disorder Fe and Zn doped YBCO
Authors: Upreti, U C
Narlikar, A V
Issue Date: Jul-2002
Publisher: NISCAIR-CSIR, India
Abstract: The preliminary investigations, on fluctuation effects due to low chemical disorders in planes and chains in Y123 system as a comparative study. The possible effects of changing the low concentration planar Cu-site substituent Zn(0.33%) by a chainer Cu-site substituent Fe of almost the same concentration (0.30%) on the order parameter dimensionality in YBCO epitaxial thin films have been investigated. Related correlations have also been discussed. In c-axis oriented laser ablated epitaxial thin films of pure and doped YBCO superconductor samples the order parameter fluctuation effects observed in the mean-field-region, are correlated with the mean field critical temperature (Tc mf), the resistivity, and the excess conductivity (Δσ). Aslamazov-Larkin(AL) theory with Anderson-Zou (AZ) model for background resistivity shows an order parameter dimensionality (OPD) cross-over in the pure film which changes to 3-dimensional (2-dimensional) superconducting behaviour by substituting low disorder of Fe (Zn). Compared to Fe doping, the dimensionality behaviour at such low-level doping of Zn suggests fast suppression of  superconductivity. The sample parameters suggest correlations such that, the dimensionality is directly proportional to Tcmf, and Δσ has weak dependence on the resistivity of a system and it (or the fluctuation) has slow suppression to low disorder of Fe.
Page(s): 476-481
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.40(07) [July 2002]

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