Superior microwave properties by post-annealing YBa2Cu3O7 thin films at low oxygen partial pressure
- 29 June 1992
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 60 (26) , 3310-3312
- https://doi.org/10.1063/1.106676
Abstract
YBa2Cu3O7 (YBCO) thin films with improved properties have been recently reported by post‐annealing in a low partial pressure of oxygen, similar to that used by in situ methods, compared to the usual post‐annealing in 1 atm of oxygen. Here it is shown that the improvements extend to the microwave surface resistance. The surface resistance was measured at close to 10 GHz; the scaled value at 10 GHz and at 77 K is 240 μΩ. This value is as low as has been reported for YBCO thin films measured around 10 GHz made by any method, and is two orders of magnitude lower than the surface resistance of copper at the same temperature and frequency.Keywords
This publication has 12 references indexed in Scilit:
- Improved barium fluoride process YBa2Cu3)7-x films via post-anneal monitoringJournal of Electronic Materials, 1992
- Optimization of annealing temperature for YBa2Cu3O7 thin films post-annealed at a low oxygen partial pressureJournal of Superconductivity, 1991
- High quality thin films of YBa2Cu3O7 by post-annealing at low oxygen partial pressurePhysica C: Superconductivity and its Applications, 1991
- Effect of oxygen pressure on the synthesis of YBa2Cu3O7−x thin films by post-deposition annealingJournal of Applied Physics, 1991
- Lower temperature post-annealing of thin films of YBa2Cu3O7 at lower oxygen partial pressureApplied Physics Letters, 1991
- Survey of microwave surface impedance data of high-T c superconductors?Evidence for nonpairing charge carriersJournal of Superconductivity, 1990
- A parallel plate resonator technique for microwave loss measurements on superconductorsReview of Scientific Instruments, 1990
- Microwave properties of highly oriented YBa2Cu3O7−x thin filmsApplied Physics Letters, 1990
- Thickness and annealing dependence of the superconducting transition temperature of YBa2Cu3O7−x thin films on oxidized silicon and polycrystalline alumina substratesApplied Physics Letters, 1988
- Effect of the post-deposition processing ambient on the preparation of superconducting YBa2Cu3O7−x coevaporated thin films using a BaF2 sourceApplied Physics Letters, 1988