Effect of Ca Substitution on the Superconductivity of La2.5Y0.5CaBa3(Cu0.88Fe0.12)7Oz |
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Authors: | M V Subbarao Amish G Joshi Nikesh A Shah D G Kuberkar and R G Kulkarni |
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Affiliation: | (1) Department of Physics, Saurashtra University, Rajkot–, 360 005, India |
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Abstract: | The structural and superconducting properties of single-phase La2.5–y
Y0.5Ca1+y
Ba3 (Cu0.88Fe0.12)7O
z
(LYCaBCuFe) (y= 0.0–1.0) compounds with triple perovskite structure are investigated using X-ray diffraction, resistivity, a.c. susceptibility, and oxygen content measurements. Increasing Ca substitution for La resulted in a decrease in unit cell axes and volume. T
c
R=0
shows a marginal increase from 31 K to 37 K for y = 0.0–0.21 and thereafter it decreases with increasing y leading to zero T
c
R=0
at y 0.84. This shows that the suppression of T
c from 80 K to 31 K by Fe doping at x = 0.12 La2.5Y0.5CaBa3(Cu1–x
Fe
x
)7O
z
cannot be compensated by appropriate hole doping with Ca in LaYCaBCuFe. |
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Keywords: | Superconductivity La2 5Y0 5CaBa3(Cu0 88Fe0 12)7O
z
compensated oxide magnetic pair breaking |
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