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Since the discovery of the existence of superconductivity at 30K, in the La-Ba-Cu-O compound, a great deal of effort has been devoted to the search of similar materials with higher critical temperatures. This has led to the discovery of the 90 K compound, and very recently to the identification of new materials with superconducting behaviour up to 110 K, and 125 K. The possibility of using liquid nitrogen, at 77K, as a cooling medium instead of liquid helium (at 4.2 K), opens new possibilities for practical applications of superconductivity. Liquid nitrogen is cheaper and more abundant than liquid helium. Furthermore cryogenic problems are less complex at liquid nitrogen temperatures. A brief review of the new high critical temperature superconductors is presented. Their superconducting properties are considered, with particular attention to magnetic field behaviour and transport critical current. The possibility of large scale applications of this new class of materials is discussed.

Additional information

Authors: PATERNO G, ENEA, Centro Ricerche Energia Frascati, CP 65 - 00044 Frascati, Roma (IT)
Bibliographic Reference: Report: RT/FUS/88/20 EN (1988)
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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