Investigation of the temperature dependence of electron and phonon Raman scattering in single crystal YBa[sub 2]Cu[sub 3]O[sub 6. 952]

Conference · Fri Apr 01 04:00:00 EST 1994 · Journal of Superconductivity; (United States)

OSTI ID:6655135

Blumberg, G ^[1]; Klein, M V ^[2]; Boerjesson, L ^[3]; Liang, R; Hardy, W N ^[4]

---

1. Univ. of Illinois, Urbana, IL (United States) Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
2. Univ. of Illinois, Urbana, IL (United States)
3. Chalmers Univ. of Technology, Gothenburg (Sweden)
4. Univ. of British Columbia, Vancouver, British Columbia (Canada)

Detailed Raman-scattering measurements have been performed on high-quality YBa[sub 2]Cu[sub 3]O[sub 6.952] single crystal (T[sub c] = 93 K, [Delta]T[sub c] = 0.3 K). A sharp (FWHM 7.2 cm[sup [minus]1] at 70 K and 10.0 cm[sup [minus]1] at 110 K) 340 cm[sup [minus]1] phonon mode has been observed in B[sub tg] polarization. An electronic scattering peak at 500 cm[sup [minus]1] in the B[sub tg] polarization extends down to 250 cm[sup [minus]1]. These FWHM values determine the upper limit of the homogeneous linewidth of the phonon and electronic excitations. The start of the electronic spectral function renormalization and of the 340 cm[sup [minus]1] mode anomalies (frequency softening, linewidth sharpening, and intensity increase) have been observed to occur approximately 40 K above T[sub c]. The 340 cm[sup [minus]1] mode Fano shape analysis has been performed and the temperature dependences of the Fano shape parameters have been estimated. All 340 cm[sup [minus]1] mode anomalies have been explained by the electronic spectral function renormalization. 24 refs., 2 figs., 1 tab.

• OSTI ID: 6655135
• Report Number(s): CONF-930710--; CNN: DMR 91-20000
• Conference Information: Journal Name: Journal of Superconductivity; (United States) Journal Volume: 7:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERAMICS
CHALCOGENIDES
COPPER COMPOUNDS
COUPLING
CRYSTALS
CUPRATES
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
RAMAN EFFECT
SCATTERING
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES