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Effect of granularity and annealing conditions on the magneto-resistance of the electron doped superconductor Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4}

A single phase polycrystalline sample of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4} has been synthesized and well characterized. Detailed studies on electrical resistivity behavior of this system as a function of temperature and magnetic field reveal interesting features attributable to the granularity effe...

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Bibliographic Details
Published in:AIP conference proceedings 2016-05, Vol.1731 (1)
Main Authors: Raveendran, N. Radhikesh, Amaladass, E. P., Janaki, J., Mani, Awadhesh
Format: Article
Language:English
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Summary:A single phase polycrystalline sample of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4} has been synthesized and well characterized. Detailed studies on electrical resistivity behavior of this system as a function of temperature and magnetic field reveal interesting features attributable to the granularity effects. These features have been qualitatively understood based on the interplay of Josephson junction coupling and quasi particle tunneling which dictates the evolution of the observed temperature and field dependent resistivity behavior of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4} system. The studies also reveal significant changes with respect to annealing conditions, indicating that such compounds are very sensitive to annealing conditions. It has been observed that prolonged annealing in Argon atmosphere leads to a decrease in normal state resistivity. This is associated with a decrease in the S-I-S type Josephson tunnel junctions perhaps due to improved inter-granular coupling, nevertheless they could not be completely eliminated.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4948134