Zero-field muon-spin-relaxation measurements have revealed the hole-concentration dependence of a static magnetically ordered state of Cu spins in excess-oxygen-doped La1.8 Nd0.2 Cu O4+δ with δ ranging from δ=0.020 to 0.101. Muon-spin precession is observed at 1.7 K for δ≤0.0625, consistent with the appearance of a long-range-ordered state of Cu spins. The volume fraction of the long-range-ordered state decreases rapidly with increasing δ, and a static magnetically disordered state of Cu spins becomes dominant for δ>0.030. The magnetic correlations between Cu spins are anomalously enhanced for δ=0.055 and near the hole concentration is 1 8 per Cu, and the superconductivity is simultaneously suppressed. The present results confirm that the so-called 1 8 anomaly is present in the excess-oxygen-doped system in addition to substitutionally doped systems.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2006|
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