Violation of Kohler's rule by the magnetoresistance of a quasi-two-dimensional organic metal

Abstract

The interlayer magnetoresistance of the quasi-two-dimensional metal $\alpha$-(BEDT-TTF)${}_2$KHg(SCN)${}_4$ is considered. In the temperature range from 0.5 to 10 K and for fields up to 10 tesla the magnetoresistance has a stronger temperature dependence than the zero-field resistance. Consequently Kohler's rule is not obeyed for any range of temperatures or fields. This means that the magnetoresistance cannot be described in terms of semiclassical transport on a single Fermi surface with a single scattering time. Possible explanations for the violations of Kohler's rule are considered, both within the framework of semi-classical transport theory and involving incoherent interlayer transport. The issues considered are similar to those raised by the magnetotransport of the cuprate superconductors.

5 pages, RevTeX + epsf, 2 figures. Slightly revised version to appear in Physical Review B, May 15, 1998

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• Angular Dependent Magnetoresistance Oscillation of a Quasi-Two-Dimensional System in a Periodic Potential
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