arXiv subjects

Miodrag L. Kulic

Publications and source records attributed to Miodrag L. Kulic.

20 records · Page 2Linked to original sources

arXiv1999

Forward Electron-Phonon Scattering and HTS

Tunneling and point contact spectroscopy show clear phonon features and together with optic measurements give strong support that the electron-phonon interaction (EPI) is large in HTS oxides. Strong correlations in HTS oxides renormalize the EPI (and interaction with impurities) so that the forward scattering peak (FSP) develops for small hole doping δ<<1. The FSP mechanism explains important properties of the normal and superconducting state.

cond-mat.supr-con↗

arXiv1996

Statics and dynamics of charge fluctuations in the t-J model

The equation for the charge vertex $γ$ of the $t-J$ model is derived and solved in leading order of an 1/N expansion, working directly in terms of Hubbard operators. Various quantities which depend crucially on $γ$ are then calculated, such as the life time and the transport life time of electrons due to a charge coupling to other degrees of freedom and the charge-charge correlation function. Our results show that the static screening of charges and the dynamics of charge fluctuations depend only weakly on $J$ and are mainly determined by the constraint of having no double occupancies of sites.

cond-mat↗