Effect of sharp structure in the electronic density of states on the electron-phonon coupling in high T/sub c/ superconductors
The evidence for sharp structure in the electronic density of states N(epsilon) of certain classes of high T/sub c/ superconductors is based on the normal state temperature dependence of the spin susceptibility chi, electronic specific-heat coefficient ..gamma.., electrical resistivity rho, and nuclear spin-lattice relaxation rate 1/T/sub 1/. Model calculations of chi, ..gamma.., rho, and T/sub 1/ in the rigid N(epsilon) approximation and of chi and ..gamma.. for a temperature dependent N(epsilon) are presented for V/sub 3/Ga and V/sub 3/Si. The model calculations have been used to calculate the explicit temperature dependence of the electron mass enhancement and the renormalized electronic specific heat coefficient. The temperature dependence of the dielectric screening, which can have an important effect on renormalizing the phonon frequencies at low temperatures, is also discussed.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 5154225
- Journal Information:
- Ferroelectrics; (United States), Vol. 16
- Country of Publication:
- United States
- Language:
- English
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