Structural phase transitions and the effect on Pr anomalous ordering for the PrBa2-xLaxCu3O7+y system

H. C. Ku*, H. M. Luo, Y. P. Chi, B. N. Lin, Y. Y. Hsu, C. H. Lin, H. C.I. Kao

*此作品的通信作者

研究成果: 雜誌貢獻會議論文同行評審

2 引文 斯高帕斯(Scopus)

摘要

Complex crystal symmetry variation is observed for the oxygenated PrBa2-xLaxCu3O7+y system (0≤x≤1, -0.12≤y≤0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa2Cu3O7 or CuBa2PrCu2O7 1212C-type (C for chain) orthorhombic O(I)-phase (space group Pmmm) to 1212-type tetragonal T-phase (P4/mmm) around x = 0.45, and then to a new 1212-type of orthorhombic O(II)-phase (Cmmm) around x = 0.65. However, regardless of the structural change, anomalous Pr ordering temperature TN(Pr) decreases monotonically from 18 K for PrBa2Cu3O6.88 to 2.8 K for PrBa1.3La0.7Cu3O7.24. The increasing Pr-O bond length with decreasing TN indicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2pπ orbital in the CuO2 bi-layers.

原文英語
頁(從 - 到)892-893
頁數2
期刊Physica B: Condensed Matter
281-282
DOIs
出版狀態已發佈 - 2000 六月 1
事件Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn
持續時間: 1999 八月 241999 八月 28

ASJC Scopus subject areas

  • 電子、光磁材料
  • 凝聚態物理學
  • 電氣與電子工程

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