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Preparation and superconducting properties of Pb2Sr2(Ho1−xCax)n−1Cun+1O2n+4 (n = 2 and 3) thin films

✍ Scribed by T. Fujiwara; Y. Koike; M. Inaba; T. Noji; M. Kato; Y. Saito

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
158 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

We have succeeded in preparing a new single-phase of Pb~Sr~(Hm-.Ca~)n-,Cu,~+,02,,.~ with n = 3 (Pb-3223 phase) and also a single phase of n = 2 (Pb-3212 phase) by thin film processing. The thin films, oriented along the c-axis, have been prepared on MgO(lO0) substrates by rfsputtering at room temperature and post-annealing at 650 -750°g in nitrogen.

The Pb-3223 phase has been found to be stable at a lower temperature than the Pb-3212 phase and to become stable with increasing x.

The thin films of the Pb-3212 phase show superconducting transition at 60 K, whereas those of the Pb-3223 phase do not show superconductivity above 4.2 K.

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