ISSN:
1572-9605
Keywords:
Raman scattering
;
electron-phonon coupling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Detailed Raman-scattering measurements have been performed on high-quality YBa2Cu3O6.952 single crystal (T c =93 K, ΔT c =0.3 K). A sharp (FWHM 7.2 cm−1 at 70 K and 10.0 cm−1 at 110 K) 340 cm−1phonon mode has been observed inB 1g polarization. An electronic scattering peak at 500 cm−1 in theB 1g polarization extends down to 250 cm−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−1 mode anomalies (frequency softening, linewidth sharpening, and intensity increase) have been observed to occur approximately 40 K aboveT c . The 340 cm−1 mode Fano shape analysis has been performed and the temperature dependences of the Fano shape parameters have been estimated. All 340 cm−1 mode anomalies have been explained by the electronic spectral function renormalization.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00724586
