The title material is known as an electron-doped high-TC superconductor, while the as-grown sample is a semiconductor. The 63Cu NMR studies for the as-grown and reduced Nd1.85Ce0.15CuO4+δ single crystals were performed. The NMR spectra of both the samples show small and continuous distribution of νQ, which has nothing to do with the appearance/disappearance of superconductivity but may be structural in origin. Both crystals exhibit single-peaked central lines with different line width showing the single phase nature and no contamination of the other phase. The NMR signal of the as-grown sample disappears around 150 K due to the magnetic ordering. On the other hand, the line width of the reduced sample is narrower than that of the as-grown sample and shows weak temperature dependence. These behaviors indicate that the antiferromagnetic short range order is depressed when the sample is reduced.
|ジャーナル||Physica C: Superconductivity and its applications|
|出版ステータス||Published - 2003 5月|
|イベント||proceedings of the 23rd international conference on low temper - Hiroshima, Japan|
継続期間: 2002 8月 20 → 2002 8月 27
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