Magnetoresistance of YBa2Cu3O7 in the "cold spots" model

Abstract

We calculate the in-plane magnetoresistance $\Delta {\rho }_{xx}/{\rho }_{xx}$ of YBa${}_2$Cu${}_3$O${}_7$ in a magnetic field applied perpendicular to the $Cu{O}_2$ planes for the ``cold spots'' model. In this model, the electron relaxation time ${\tau }_2\propto 1/T^2$ at small regions on the Fermi surface near the Brillouin zone diagonals is much longer than the relaxation time ${\tau }_1\propto 1/T$ at the rest of the Fermi surface ($T$ is temperature). In qualitative agreement with the experiment, we find that Kohler's rule is strongly violated, but the ratio $\Delta {\rho }_{xx}/{\rho }_{xx}{\tan }^2{\theta }_H$, where $\tan {\theta }_H$ is the Hall angle, is approximately temperature-independent. We find the ratio is about 5.5, which is of the same order of magnitude as in the experiment.

RevTeX, 4 pages, 6 figures. V.2: 2 references added

References in corpus (2)

• High field study of normal state magneto-transport in the thallium cuprate Tl-2201
• Intrinsic temperature dependences of transport coefficients within the hot-spot model for normal state YBCO

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