Dresden 2003 – scientific programme
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TT: Tiefe Temperaturen
TT 19: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter II
TT 19.4: Talk
Thursday, March 27, 2003, 15:15–15:30, HSZ301
Influence of the pseudogap on the superconductivity-induced phonon renormalization in high-Tc superconductors — •Serguei Varlamov and Goetz Seibold — Institut fuer Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany
We investigate the influence of a d-density wave (DDW) gap on the superconductivity-induced renormalization of phonon frequency and linewidth. The results are discussed with respect to Raman and inelastic neutron scattering experiments. It turns out that the DDW gap can enhance the range of frequencies for q=0 phonon softening depending on the underlying band structure. Moreover we show that an anisotropic ’d-wave’ pseudogap can also contribute to the q-dependent linewidth broadening of the 340cm−1 phonon in YBa2Cu3O7.