Resistivity in Cuprates and the Pseudogap

Abstract

The temperature dependence of resistivity (ρ) in the normal state of La 2−x Sr x CuO 4 is calculated from electron transfer (ET) rates. The minimum at about 100 K for doping levels less than 6 % is characteristic for all cuprates. The resistivity depends on ET between Cu(III) and Cu(II) sites. For T < 300 K, the resistivity is proportional to T 3/2 . The more than linear increase of ρ for T >100 K depends on increased kinetic energy in a Landau avoided crossing. The agreement with experimental data is convincing. The behaviour for T → 0 can be explained as nuclear tunnelling. For T > 400 K, ρ bends down, presumably because the pseudogap is overcome at a higher kinetic energy.

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Природа Псевдощелевой Фазы ВТСП Купратов

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