Magnon-scattering spectra of PrBa sub 2 Cu sub 3 O sub 6 , PrBa sub 2 Cu sub 3 O sub 7 , NdBa sub 2 Cu sub 3 O sub 6 , and Nd sub 1. 6 Ba sub 1. 4 Cu sub 3 O sub 7. 3

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.8760· OSTI ID:6226224

Yoshida, M; Koshizuka, N; Tanaka, S ^[1]

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1. Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku (Tokyo)

Raman-scattering spectra from PrBa{sub 2}Cu{sub 3}O{sub 6}, PrBa{sub 2}Cu{sub 3}O{sub 7}, NdBa{sub 2}Cu{sub 3}O{sub 6}, and Nd{sub 1.6}Ba{sub 1.4}Cu{sub 3}O{sub 7.3} single crystals have been measured at room temperature. Magnon-pair-scattering peaks with {ital B}{sub 1{ital g}} symmetry have been observed in PrBa{sub 2}Cu{sub 3}O{sub 6}, NdBa{sub 2}Cu{sub 3}O{sub 6}, and Nd{sub 1.6}Ba{sub 1.4}Cu{sub 3}O{sub 7.3}, and the exchange integrals have been determined as 920, 930, and 950 cm{sup {minus}1}, respectively. The exchange integral of the compounds with the Cu-O{sub 5} pyramid structure decreases as the Cu-Cu distance increases. On the other hand, it is found that the magnon-pair scattering is suppressed in nonsuperconducting PrBa{sub 2}Cu{sub 3}O{sub 7}, suggesting that holes are not localized on the Pr site, but have a probability to populate the Cu-O plane just as in the superconducting Y-Ba-Cu-O--type compounds.

• OSTI ID: 6226224
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
RAMAN SPECTRA
COPPER OXIDES
NEODYMIUM OXIDES
PRASEODYMIUM OXIDES
EXCHANGE INTERACTIONS
HIGH-TC SUPERCONDUCTORS
MAGNONS
MEDIUM TEMPERATURE
MONOCRYSTALS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
INTERACTIONS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties