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Title: Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system

Abstract

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 inmore » that state.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Materials and Electronic Device Lab., Mitsubishi Electric Corp., 1-1-57 Miyashimo, Sagamihara, Kanagawa (JP)
OSTI Identifier:
5893505
Report Number(s):
CONF-880812-
Journal ID: CODEN: IEMGA
Resource Type:
Conference
Journal Name:
IEEE Trans. Magn.; (United States)
Additional Journal Information:
Journal Volume: 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; BISMUTH OXIDES; PHASE STUDIES; CALCIUM OXIDES; COPPER OXIDES; STRONTIUM OXIDES; SUPERCONDUCTORS; SYNTHESIS; BARIUM OXIDES; CRITICAL CURRENT; CURRENT DENSITY; HIGH TEMPERATURE; METASTABLE STATES; OXYGEN; PARTIAL PRESSURE; SINTERING; SOLID-STATE PLASMA; SUPERCONDUCTING JUNCTIONS; SUPERCONDUCTIVITY; YTTRIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CURRENTS; ELECTRIC CONDUCTIVITY; ELECTRIC CURRENTS; ELECTRICAL PROPERTIES; ELEMENTS; ENERGY LEVELS; EXCITED STATES; FABRICATION; JUNCTIONS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PLASMA; STRONTIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 656100* - Condensed Matter Physics- Superconductivity; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties; 656001 - Condensed Matter Physics- Solid-State Plasma

Citation Formats

Miyashita, S, Wakata, M, Nozaki, A, Egawa, K, Ogama, T, and Yoshizaki, K. Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system. United States: N. p., 1989. Web.
Miyashita, S, Wakata, M, Nozaki, A, Egawa, K, Ogama, T, & Yoshizaki, K. Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system. United States.
Miyashita, S, Wakata, M, Nozaki, A, Egawa, K, Ogama, T, and Yoshizaki, K. Wed . "Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system". United States.
@article{osti_5893505,
title = {Synthesis of a high T/sub C/ superconducting phase in Bi-Sr-Ca-Cu-O system},
author = {Miyashita, S and Wakata, M and Nozaki, A and Egawa, K and Ogama, T and Yoshizaki, K},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/5893505}, journal = {IEEE Trans. Magn.; (United States)},
number = ,
volume = 25:2,
place = {United States},
year = {1989},
month = {3}
}

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