Abstract
Mechanism of electrical conductivity in the normal state of the perovskite-type oxide superconductor Ba 0.58 K 0.42 BiO 2.96 has been investigated by measuring the conductivity and the Hall coefficient in the temperature range of 20–300 K, using a single crystal which seems to exhibit the intrinsic feature of conductivity because of the small residual resistivity value of 1×10 -4 Ω·cm. The best analytical fit of temperature dependence of resistivity is obtained assuming scattering of the electron by both the acoustic phonon with the Debye temperature of 320 K and the optical phonons with the Einstein temperatures of 835 K and 460 K. The small value of the Hall mobility of about 2 cm 2 /V·s at room temperature means strong interaction of electrons with phonons. We emphasize the important role of electron-LO phonon interaction in the mechanism of conductivity.
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