Effect of reductive treatment on the magnetic properties of HoBa2Cu3Oy and NdBa2Cu3Oy oxide systems

被引：0
|
作者：
Lunina, EV [1 ]
Galkin, AA [1 ]
Lunin, VV [1 ]
Zhilinskaya, EA [1 ]
Aboukais, A [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia
来源：
KINETICS AND CATALYSIS | 2000年 / 41卷 / 06期
关键词：
D O I：
10.1023/A:1026677220675
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of the reductive treatment of perovskite-like RBa2Cu3Oy (R = Ho, Nd) complex oxides in a CO atmosphere on their superconducting and magnetic properties is studied by ESR spectroscopy. ESR spectra of initial RBa2Cu3Oy phases exhibit only a low-field absorption signal in the zero field (T = 77 K). This signal disappears after the exposure of test samples to carbon monoxide. The analysis of ESR spectra of reduced samples points to the formation of regions with high local concentrations of isolated Cu2+ ions and Cu2+-Cu2+ dimers. The concentration of these paramagnetic species significantly decreases with an increase in the degree of reduction.
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页码：794 / 798
页数：5
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