Study of Oxygen Isotope Effect in Pr, Ca, And Zn Doped Superconductivity YBa2Cu3O7-Δ,
Journal Title: International Journal of Applied and Natural Sciences - Year 2017, Vol 6, Issue 2
Abstract
The oxygen isotope effect in Pr, Ca, and Zn doped superconductivity YBa2Cu3O7-δ was investigated. Pr and Ca substitute predominantly at the Y site while Zn goes into the Cu plane site. The shift in critical temperature (∆TC) between samples oxygenated in 18O and 16O was obtained via dc resistance measurements, and low field dc magnetization and ac susceptibility measurements in a SQUID magnetometer. Confirmation of the substitution of the oxygen was a achieved with Raman and SIMS measurements. The Pr, Ca and Zn substituted change TC of the superconductor in different ways. Increasing Pr concentrations lower TC and increase ∆TC with the isotope coefficient, α, approaching1⁄2. The additions of ca reduces the size of both ∆Tc and α. Both exhibit a small parabolic effect with increasing Ca substitution. An increase in Zn substitution. An increase in Zn substituted lowers TC but ∆TC remains nearly constant, or perhaps gets slightly smaller, with α increasing to approximately1⁄3.
Authors and Affiliations
SINGH K. P, SUMIT KUMARGUPTA, RASHMI MEEL
Keywords
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