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

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)892-893
Number of pages2
JournalPhysica B: Condensed Matter
Volume281-282
DOIs
Publication statusPublished - 2000 Jun 1
EventYamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn
Duration: 1999 Aug 241999 Aug 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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