Residual-resistivity anisotropy in potassium

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Abstract
We present evidence from induced-torque measurements of Holroyd and Datars supporting an anisotropy in the residual resistivity of potassium of about five to one and argue against explanation of their data by extrinsic mechanisms. We expalin how the hypothesis that the conduction electrons are in a static charge-density-wave state leads naturally to the prediction of a large residual resistivity anisotropy. Resistivity calculations are performed using several model impurity-scattering potentials. Numerical results are presented for parameters characteristic of potassium, yielding anisotropies as large as four to one. We suggest that induced-torque experiments might be used to determine whether a given potassium sample has a single charge-density-wave domain and encourage that de Haas-van Alphen experiments be performed on such "single-domain" samples.

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