Superconducting phase transitions in the La-M-Cu-O layered perovskite system, M=La, Ba, Sr, and Pb

We report results of our studies of the La-Mu-Cu-O system, M = La, Ba, Sr, and Pb. T/sub c/ and the magnetic moment are correlated with annealing schedules and x-ray structural analyses. The occurrence of superconductivity is associated with the formation of Cu/sup 3+/ ions producing an expansion of...

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Veröffentlicht in:	Phys. Rev. B: Condens. Matter; (United States) 1987-04, Vol.35 (10), p.5350-5352
Hauptverfasser:	GUBSER, D. U, HEIN, R. A, LAWRENCE, S. H, OSOFSKY, M. S, SCHRODT, D. J, TOTH, L. E, WOLF, S. A
Format:	Artikel
Sprache:	eng
Schlagworte:	360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies 360204 - Ceramics, Cermets, & Refractories- Physical Properties 656100 - Condensed Matter Physics- Superconductivity ALKALINE EARTH METAL COMPOUNDS BARIUM COMPOUNDS BARIUM OXIDES CHALCOGENIDES CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER COMPOUNDS COPPER OXIDES ELECTRIC CONDUCTIVITY ELECTRICAL PROPERTIES Exact sciences and technology LANTHANUM COMPOUNDS LANTHANUM OXIDES LEAD COMPOUNDS LEAD OXIDES MAGNETIC MOMENTS MATERIALS SCIENCE Occurrence, potential candidates OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics RARE EARTH COMPOUNDS STRONTIUM COMPOUNDS STRONTIUM OXIDES SUPERCONDUCTIVITY THERMODYNAMIC PROPERTIES TRANSITION ELEMENT COMPOUNDS TRANSITION TEMPERATURE VERY LOW TEMPERATURE
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Zusammenfassung:	We report results of our studies of the La-Mu-Cu-O system, M = La, Ba, Sr, and Pb. T/sub c/ and the magnetic moment are correlated with annealing schedules and x-ray structural analyses. The occurrence of superconductivity is associated with the formation of Cu/sup 3+/ ions producing an expansion of the c parameter of the unit cell. We have found magnetic and resistive anomalies throughout near 65 K in some La-Ba-Cu-O samples. These samples show a slight depression of the superconducting transition temperature.
ISSN:	0163-1829 1095-3795
DOI:	10.1103/PhysRevB.35.5350