Phase separation and softening of the {ital O}2,3 in-phase mode in the YBa{sub 2}Cu{sub 3}O{sub {ital x}} superconductors

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.R534· OSTI ID:434528

Poulakis, N; Palles, D; Liarokapis, E ^[1]; Conder, K; Kaldis, E ^[2]; Mueller, K A ^[3]

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1. Department of Physics, National Technical University, Athens 15780 (Greece)
2. Laboratorium fur Festkoerperphysik, Eidgenoessishe Technische Hochscule---Honggerberg, CH-8093 Zurich (Switzerland)
3. IBM Zurich Research Laboratory, Saumerstrasse 4, CH-8803 Rueschlikon (Switzerland)

Systematic Raman measurements have been carried out on the {ital YBa}{sub 2}{ital Cu}{sub 3}{ital O}{sub {ital x}} superconductors with very well-defined oxygen concentration 6.4{lt}{ital x}{lt}7.0. In contrast to the literature, the frequencies of some of the phonons do not vary linearly with the oxygen content. The variation of the phonon characteristics of the apex oxygen mode with doping is consistent with the development of superstructures. A softening of the phonon due to the in-phase vibrations ({ital A}{sub {ital g}} mode) of the plane oxygen atoms takes place in the overdoped region. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 434528
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AMBIENT TEMPERATURE
BARIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
CUPRATES
DISPERSION RELATIONS
HIGH-TC SUPERCONDUCTORS
MICROANALYSIS
MONOCRYSTALS
PHONONS
QUANTITATIVE CHEMICAL ANALYSIS
RAMAN SPECTRA
REAGENTS
STOICHIOMETRY
SUBSTOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TRACE AMOUNTS
TRANSITION TEMPERATURE
YTTRIUM OXIDES