Magnetic and superconducting properties of RuSr2Gd1.5Ce0.5Cu2O10-δ samples:: Dependence on the oxygen content and aging effects -: art. no. 134509

被引：27

作者：

Cardoso, CA ^{[1
]}

Lanfredi, AJC

Chiquito, AJ

Araújo-Moreira, FM

Awana, VPS

Kishan, H

de Almeida, RL

de Lima, OF

机构：

[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Paulo, Brazil

[2] Natl Phys Lab, New Delhi 110012, India

[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.71.134509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic and superconducting properties of RuSr2Gd1.5Ce0.5Cu2O10-delta polycrystalline samples with different oxygen-doping levels are presented. A strong suppression of the superconducting temperature (T-c), as well as a reduction in the superconducting fraction, occurs as the oxygen content is reduced by annealing the samples in oxygen-deprived atmospheres. Drastic changes in the electrical resistivity are observed above T-c, possibly associated with oxygen removal, mainly from grain boundaries. However, the magnetic ordering is relatively less affected by the changes in oxygen content of the samples. The spin-glass transition is enhanced and shifted to higher temperatures with the reduction in oxygen content. This could be correlated with an increase in the spin disorder and frustration for the oxygen-depleted samples. Also, the same oxygen-vacancy-induced disorder could explain the reduction in the fraction of the sample showing antiferromagnetic order. We also report significant changes in the measured properties of the samples as a function of time.

引用

页数：7

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