Doping and temperature dependence of {ital c}-axis optical phonons in YBa{sub 2}Cu{sub 3}O{sub {ital y}} single crystals

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.13665· OSTI ID:122343

Schuetzmann, J; Tajima, S; Miyamoto, S; Sato, Y; Hauff, R ^[1]

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

Measuring the far-infrared reflectivity of YBa{sub 2}CuO{sub 3}O{sub {ital y}} crystals with radiation polarized parallel to the {ital c} axis, we determined the doping and temperature dependence of {ital c}-axis infrared active phonons. Superconductivity related effects on the phonon self-energies are weak for the overdoped crystal, but pronounced for the optimally doped crystal. The differences are attributed to a lower symmetry of the optimally doped crystal due to disorder in the oxygen sublattice which manifests in a splitting of the apical oxygen vibration into well distinct modes above 600 cm{sup {minus}1}. For the underdoped crystals anomalies are observed well above {ital T}{sub {ital c}}. The onset temperature of the anomalies increases with decreasing doping, suggesting a relationship with the spin-gap temperature. The dramatic decrease in oscillator strength of the in-plane oxygen bending mode is related to a growth of a new broad excitation centered between 450 and 400 cm{sup {minus}1}.

• Sponsoring Organization: USDOE
• OSTI ID: 122343
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
CRYSTAL DOPING
CUPRATES
FAR INFRARED RADIATION
HIGH-TC SUPERCONDUCTORS
INFRARED SPECTRA
MONOCRYSTALS
OSCILLATOR STRENGTHS
OXYGEN ADDITIONS
PHONONS
SPECTRAL REFLECTANCE
STOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION TEMPERATURE
YTTRIUM OXIDES