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Title: Exploring the site occupancy effects of equal low concentrations of Zn and Fe dopants on order parameter fluctuations in Y123 bulk samples: A preliminary investigation
Authors: Upreti, U C
Narlikar, A V
Issue Date: Nov-2002
Publisher: NISCAIR-CSIR, India
Abstract: In this preliminary exploratory investigation report, the authors look for and compare, mainly in the mean -field- region (MFR), the effects, if any, on order parameter dimensionality (OPD) and excess conductivity (Δσ) due to separate equal(0.5%) low concentration substitutions of Zn and Fe at the Cu-sites in Y123 polycrystalline bulk superconductor samples. The OPD dependence on change of Cu-site low disorder dopant and the effects of OPD variation on the inter layer coupling, on its cross-over behaviour, on superconductivity suppression and anisotropy are discussed. It is seen that the OPD increases by Fe doping but is independent of intrinsic disorder in pure as well as in the Fe doped sample. The system anisotropy is invariant to (raised with) Zn (Fe) low disorder. In pure and Zn doped samples, the dimensionality behaviour enables us to estimate the c-direction coherence length (ξc) and consequently, the Josephson coupling strength (J). At these doping levels, there is no significant change in J due to Zn, whereas the OPD behaviour in Fe doped sample does not allow us to estimate ξc and J.
Page(s): 795-800
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.40(11) [November 2002]

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