Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system
The synthesis of a high T/sub c/ (critical temperature) phase in Bi-Sr-Ca-Cu-O (BSCCO) system by the solid-state reaction and the J/sub c/ (critical current density) characteristics are reported. The partial pressure of oxygen near 0.1 atm. is preferable as a sintering atmosphere and the Pb addition is effective to produce a large amount of a high T/sub c/ phase. Two classes of amorphous-like metastable superconducting phases with T/sub c/ of --90 K and --40 K are found. It is thought that they may have a randomly stacked structure with triple and double / double and single Cu-O planes between Bi/sub 2/O/sub 2/ planes along c-axis. The J/sub c/ of 93 A/cm/sup 2/ at zero field, 77 K is obtained for the sample with T/sub c/ (rho=0) = 107 K, which includes a high T/sub c/ phase and a small amount of a low T/sub c/ phase covered with the former phase. The J/sub c/ is exponentially decreased with increasing the field. It is found that the transport J/sub c/ is limited by the weak-link regions in this system similar to in YBCO system by the observation of a low resistive state above the J/sub c/ and of the superconductivity in that state.
- Research Organization:
- Materials and Electronic Device Lab., Mitsubishi Electric Corp., 1-1-57 Miyashimo, Sagamihara, Kanagawa (JP)
- OSTI ID:
- 5893505
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Mechanisms controlling the in-situ formation and superconducting properties of Bi-Sr-Ca-Cu-O films
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