SUPERCONDUCTIVITY BELOW 40 K IN ORTHORHOMBIC STRUCTURE OF LANTHANUM-COPPER OXIDE.

SUPRACONDUCTIVITE EN DESSOUS DE 40 K DE L'OXYDE DE LANTHANE ET DE CUIVRE DE STRUCTURE ORTHORHOMBIQUE.

Type of article: Article

Summary

USING RESISTIVITY, SUSCEPTIBILITY, MEISSNER EFFECT MEASUREMENTS THE AUTHORS SHOW, FOR THE FIRST TIME, THAT LANTHANUM-COPPER OXIDE IS SUPERCONDUCTING BELOW 40 K. THE SUPERCONDUCTIVITY ONSET TEMPERATURE IS 47 K. A CRITICAL FIELD STUDY REVEALS STRONG ANISOTROPY EFFECTS. THE CRITICAL TEMPERATURE T RAISES FROM 37.6 TO 42.4 K APPLYING A 19 KILOBAR PRESSURE. THIS SUPERCONDUCTIVITY APPEARS IN A SEMICONDUCTING STATE HAVING A RESISTIVITY OF 5 OHMS.CM AT T. THE AUTHORS SUGGEST THAT THE LANTHANUM-COPPER OXIDE LAYER STRUCTURE MAKES POSSIBLE THE APPEARANCE OF EXCITONIC SUPERCONDUCTIVITY.

Details

Original title: SUPRACONDUCTIVITE EN DESSOUS DE 40 K DE L'OXYDE DE LANTHANE ET DE CUIVRE DE STRUCTURE ORTHORHOMBIQUE.
Record ID : 1987-1684
Languages: French
Source: C. R. Acad. Sci., Sér. II - vol. 304 - n. 18
Publication date: 1987/05/14
Document available for consultation in the library of the IIR headquarters only.

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Indexing

Themes: Superconduction
Keywords: Superconduction; Copper; Lanthanum; Critical temperature; Superconductor; Electric property