Anomalous magnetoresistance and hall current in the normal state of the cuprate superconductors

• Published in: Physica. C, Superconductivity Superconductivity, 1991-12, Vol.185, p.34-39
• Main Authors: Ong, N.P., Jing, T.W., Chien, T.R., Wang, Z.Z., Ramakrishnan, T.V., Tarascon, J.M., Remschnig, K.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Conductivity phenomena in semiconductors and insulators; Electronic transport in condensed matter; Exact sciences and technology; Galvanomagnetic and other magnetotransport effects; Physics
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/0921-4534(91)91946-2

Experiments on the normal-state Hall effect in YBa 2Cu 3O 7 and the normal-state magnetoresistance in Bi 2Sr 2CuO 6(Bi 2201) are described. The strong temperature dependence of the Hall resistivity is shown to derive from a ‘Hall scattering rate’ 1/τ H that varies as the square of temperature, in contrast to the transport scattering rate 1/τ tr. Scattering from zinc impurities increases both rates. We compare our results with a recent theory of Anderson. Low-temperature magnetoresistance (MR) has been used to extract the dephasing rate 1/τ φ in single-crystal Bi 2001. Between 0.4 and 20 K, 1/τ φ varies as T 1 3 . We discuss the anomalous enhancement of the dephasing rate and implications for the usual quasi-particle picture. The MR in a longitudinal field shows novel features that do not fi t conventional interaction theory.