Abstract
In this paper, we report the correlation between the magnetic property and the local structure in BaY(Cu0.5Fe0.5)2O5+δ of the “0112” phase containing an unusually large amount of excess oxygen, δ of ∼0.2, when heat treated under a high pressure of 5 GPa. Magnetic susceptibility measurements showed that upon the high-pressure heat treatment, the lower-temperature magnetic transition which had been observed in normal-pressure synthesized, antiferromagnetic BaY(Cu0.5Fe0.5)2O5 disappeared and the higher-temperature transition, i.e., the Néel temperature, was lowered. According to a Rietveld analysis based on x-ray-diffraction data and space group P4/mmm, the distinction between Cu and Fe positions along the c axis inside the oxygen pyramid disappeared. Coulometric titrations and Mössbauer spectroscopy measurements strongly suggested the existence of excess oxygen in the yttrium plane.
| Original language | English |
|---|---|
| Pages (from-to) | 3371-3376 |
| Journal | Physical Review B |
| Volume | 58 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1998 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- copper oxide
- iron oxide
- magnetic
- perovskite
- structure