High-Tc metal oxide as Mott-Hubbard unstable paraelectric: temperature dependence of resistivity and Hall effect

The model of the paraelectric, which is close to the point of the Mott-Hubbard instability, is shown to explain the DC resistivity and Hall effect temperature behaviour for high-Tc superconductor metal oxides (HTSC). In the ground state the current is carried by a liquid of boson-like pairs of carriers in upper and lower Hubbard bands. The Mott-Hubbard instability corresponds to the order-of-lattice-constant length of the mean free path and results in the temperature insensitivity of Drude conductivity. Nearly linear on T resistivity results from the Curie law via the local (acting) electric field. Fermion-like carriers, temperature excited over the energy of boson-like pair dissociation (pseudogap), explain the temperature behaviour of Hall effect. Available data are compared with the model.