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Magnetic studies of Pr2−xCexCuO4−δ

✍ Scribed by Maria Földeáki; Hassel Ledbetter; Yoshikazu Hidaka

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
152 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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✦ Synopsis

In Pr2.xCexCu04. 6 compounds with x -0.15, 0.18, we observed superconductivity below about 20 K. We measured magnetic hysteresis at 5 K in fields of 0.01-I.I T. Above 0.5 T, the single-ion paramagnetism of Pr(3+) overwhelms the superconductivity.

After correction, the superconductive M-H hysteresis loop shows a pinched-neck shape, resembling that found in Bi-Pb-Sb-Ca-Sr-Cu-O. This shape is attributed to dynamic flux-depinning effects. Time dependence of both the Heissner effect after zero-field cooling and the remanence after field cooling was studied in a O.OI-T field.

It can be described best by an empirical relationship M(t) ~ H(o)t -~, proving the failure of a simple thermally activated flux-creep model.

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