OXYGEN DISTRIBUTION IN LA1.8SR0.2CUO4-DELTA - EFFECTS ON TRANSPORT-PROPERTIES

被引：5

作者：

DECCA, R ^{[1
]}

SERAFINI, D ^{[1
]}

DELACRUZ, F ^{[1
]}

ABRIATA, J ^{[1
]}

机构：

[1] INST BALSEIRO,BARILOCHE,ARGENTINA

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.48.4014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We determined the effect of oxygen depletion on transport properties of La1.8Sr0.2CuO4-delta ceramic samples measuring simultaneously the change of resistivity and mass as a function of oxygen partial pressure, at 900-degrees-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 to the intergrain weak links. We show that the interpretation of conventional techniques used to determine the absolute value of the oxygen content does not produce meaningful results.

引用

页码：4014 / 4018

页数：5

共 33 条

[21] METALLIC TO VARIABLE-RANGE-HOPPING TRANSITION CONTROLLED BY OXYGEN-CONTENT IN LA-SR-CU-O [J].