Structural phase transitions and the effect on Pr anomalous ordering for the PrBa 2-x La x Cu 3 O 7+y system

H. C. Ku, H. M. Luo, Y. P. Chi, B. N. Lin, Yung-Yuan 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 PrBa 2-x La x Cu 3 O 7+y system (0≤x≤1, -0.12≤y≤0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa 2 Cu 3 O 7 or CuBa 2 PrCu 2 O 7 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 T N (Pr) decreases monotonically from 18 K for PrBa 2 Cu 3 O 6.88 to 2.8 K for PrBa 1.3 La 0.7 Cu 3 O 7.24 . The increasing Pr-O bond length with decreasing T N indicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2p π orbital in the CuO 2 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

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Rietveld analysis
Crystal symmetry
Bond length
Wave functions
Powders
Crystal structure
Phase transitions
Cuba
X rays
orbitals
wave functions
Temperature
crystal structure
symmetry
crystals
x rays
temperature

ASJC Scopus subject areas

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

Cite this

Structural phase transitions and the effect on Pr anomalous ordering for the PrBa 2-x La x Cu 3 O 7+y system . / Ku, H. C.; Luo, H. M.; Chi, Y. P.; Lin, B. N.; Hsu, Yung-Yuan; Lin, C. H.; Kao, H. C.I.

In: Physica B: Condensed Matter, Vol. 281-282, 01.06.2000, p. 892-893.

Research output: Contribution to journalConference article

Ku, H. C. ; Luo, H. M. ; Chi, Y. P. ; Lin, B. N. ; Hsu, Yung-Yuan ; Lin, C. H. ; Kao, H. C.I. / Structural phase transitions and the effect on Pr anomalous ordering for the PrBa 2-x La x Cu 3 O 7+y system In: Physica B: Condensed Matter. 2000 ; Vol. 281-282. pp. 892-893.
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abstract = "Complex crystal symmetry variation is observed for the oxygenated PrBa 2-x La x Cu 3 O 7+y system (0≤x≤1, -0.12≤y≤0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa 2 Cu 3 O 7 or CuBa 2 PrCu 2 O 7 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 T N (Pr) decreases monotonically from 18 K for PrBa 2 Cu 3 O 6.88 to 2.8 K for PrBa 1.3 La 0.7 Cu 3 O 7.24 . The increasing Pr-O bond length with decreasing T N indicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2p π orbital in the CuO 2 bi-layers.",
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T1 - Structural phase transitions and the effect on Pr anomalous ordering for the PrBa 2-x La x Cu 3 O 7+y system

AU - Ku, H. C.

AU - Luo, H. M.

AU - Chi, Y. P.

AU - Lin, B. N.

AU - Hsu, Yung-Yuan

AU - Lin, C. H.

AU - Kao, H. C.I.

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N2 - Complex crystal symmetry variation is observed for the oxygenated PrBa 2-x La x Cu 3 O 7+y system (0≤x≤1, -0.12≤y≤0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa 2 Cu 3 O 7 or CuBa 2 PrCu 2 O 7 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 T N (Pr) decreases monotonically from 18 K for PrBa 2 Cu 3 O 6.88 to 2.8 K for PrBa 1.3 La 0.7 Cu 3 O 7.24 . The increasing Pr-O bond length with decreasing T N indicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2p π orbital in the CuO 2 bi-layers.

AB - Complex crystal symmetry variation is observed for the oxygenated PrBa 2-x La x Cu 3 O 7+y system (0≤x≤1, -0.12≤y≤0.39). Powder X-ray Rietveld analysis indicates that the crystal structure changes from the PrBa 2 Cu 3 O 7 or CuBa 2 PrCu 2 O 7 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 T N (Pr) decreases monotonically from 18 K for PrBa 2 Cu 3 O 6.88 to 2.8 K for PrBa 1.3 La 0.7 Cu 3 O 7.24 . The increasing Pr-O bond length with decreasing T N indicates that Pr ordering is closely correlated with the wave function overlap between Pr-4f orbital and O-2p π orbital in the CuO 2 bi-layers.

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