Oxygen distribution inLa1.8Sr0.2CuO4−δ: Effects on transport properties

Autor:	J.P Abriata, F. De La Cruz, R. Decca, D. Serafini
Rok vydání:	1993
Předmět:	Superconductivity Materials science Condensed matter physics Transition temperature chemistry.chemical_element Partial pressure Oxygen Drude model chemistry Electrical resistivity and conductivity visual_art Quasiparticle visual_art.visual_art_medium Ceramic
Zdroj:	Physical Review B. 48:4014-4018
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.48.4014
Popis:	We determined the effect of oxygen depletion on transport properties of La 1.8 Sr 0.2 CuO 4-δ ceramic samples measuring simultaneously the change of resistivity and mass as a function of oxygen partial pressure, at 900 o C. It has been found that the sample resistance is extremely sensitive to small changes of the sample oxygen content, indicating that oxygen vacancies are highly correlated. The results support a granular picture where quasiparticles in the normal state and electron pairs in the superconducting state tunnel through insulating barriers. In this picture oxygen occupies two well distinguishable regions in the sample: one associated to the intragrain superconducting material and the other ot the intergrains weak links
Databáze:	OpenAIRE
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