A study of the superconducting properties of YBa2Cu(9-x)Nb(x)O(y) thin films
- Eidgenoessische Technische Hochschule, Zurich (Switzerland)
Effect of Niobium substitution at the copper site in YBa2Cu3O(7-x) was studied in thin film form. The films were deposited by laser ablation technique using the targets of the YBa2Cu(3-x)Nb(x)O(y) where x = 0.0, 0.025, 0.05, 0.1, 0.2, 0.4, 0.8 and 1.0 under identical deposition conditions on SrTiO3 (100) substrates. Films were characterized by XRD, resistivity, I-V and J(sub c) measurements. Films made from x = 0.025 and 0.05 concentrations of Nb substituted targets showed relatively improved superconducting properties compared to that of undoped films. The best J(sub c) realized for x = 0.025 Nb concentration was 1.8 x 10(exp 6) A/sq cm and for 0.05 Nb concentration it was 3.2 x 10(exp 6) A/sq cm at 77 K. However, degradation of the superconducting properties, with the increase of x is greater than or equal to 0.1 Nb concentration and drastic suppression and complete loss of superconductivity was noticed for x is greater than or equal to 0.4. The growth of impurity phase YBa2NbO6 for x = 0.1 and above of Nb concentration was noted from XRD (X-Ray Diffraction) patterns. However, the site occupancy of Nb could not be confirmed from these studies.
- Research Organization:
- Argonne National Lab., IL (United States)
- OSTI ID:
- 135403
- Report Number(s):
- N--96-10272; NASA-CP--3290-VOL-2; S--792-VOL-2; NAS--1.55:3290-VOL-2; CONF-940627--
- Country of Publication:
- United States
- Language:
- English
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