Sequential electron beam evaporated films of Tl2CaBa2Cu2Oy with zero resistance at 97 K
- 1 August 1988
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 53 (5) , 406-408
- https://doi.org/10.1063/1.100604
Abstract
Thin unoriented polycrystalline films in the Tl‐Ca‐Ba‐Cu‐O system were prepared by sequential electron beam evaporation of multiple Tl, Ca, Ba, and Cu layers and a two‐stage anneal under controlled Tl and oxygen overpressures. These films show zero resistance as high as 97 K and transport critical current densities at 76 K up to 110 000 A/cm2 with typical values of 50 000 A/cm2. The critical currents exhibit a modest magnetic field dependence. Meissner effect data show an onset at 110 K and a superconducting fraction of 75%. Compositional and structural studies indicate that the films, although polyphase, are predominantly Tl2Ca1Ba2Cu2Oy. There is no evidence of other superconducting phases.Keywords
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