頁籤選單縮合
| 題 名 | Anomalous Pr-Ordering in High-Tc Cuprate Systems |
|---|---|
| 作 者 | Ku,H. C.; Hsu,Y. Y.; Lee,T. J.; Ho,J. C.; | 書刊名 | Chinese Journal of Physics |
| 卷 期 | 36:2(Part2) 民87.04 |
| 頁 次 | 頁292-296 |
| 分類號 | 330 |
| 關鍵詞 | |
| 語 文 | 英文(English) |
| 英文摘要 | The systematic variation of anomalous Pr antiferromagnetic ordering for the two-CuO₂-layer 1212 cuprate system MA₂PrCu₂O₇ (M = Hg, Pb, Tl, Cu, Nb; A = Sr, Ba) was verified through the variation of Néel temperature TN(Pr) with Pr-O bond length and Pr minimum magnetic entropy Sm. The importance of quasi-2D Pr-O-Pr superexchange magnetic coupling through the strong hybridization between the Pr-4f and the eight O-2ρπ orbitals in the adjacent CuO₂ layers is expected for all two-CuO₂-layer MmA₂PrCu₂Oy m212-type (m = 1,2,3) compounds, and similarly anomalous Pr compounds were observed in M₂A₂PrCu₂O₈ and M₃A₂PrCu₂O₈ (M = Pb, Cu; A = Ba, Sr). The only case with absence of long rang TN(Pr) down to 1.4 K was in the incommensurate modulated Bi-2212 compound Bi₂Sr₂PrCu₂O₈+δ. |
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