Anisotropic Corbino conductivity in a magnetic field

The magnetoconductivity in anisotropic Corbino geometry has been studied experimentally and theoretically. The magnetoconductivity curve sigma(rr)(B) follows the average magnetoconductivity sigma(ar)(B) = (sigma(xx)(B) + sigma(yy)(B))/2 in classically strong magnetic fields. In the region of classically weak magnetic fields, sigma(rr)(B) goes below sigma(ar)(B). A theoretical study of anisotropic Corbino disk (ACD) magnetoconductivity has been carried out using the classical description of transport based on the calculation of current streamlines. The expressions for calculating the ACD magnetoconductivity for an arbitrary degree of anisotropy have been obtained. In the region of fields B > 1/mu, where mu is the mobility, the calculation results are in good agreement with the experiment. In the fields B < 1/mu, we have not been able to compare the calculations with the experiment because of using samples with too high mobility and a simple two-point measurement scheme. Our calculations allow us to estimate the value of deviation of the ACD magnetoconductivity from the average magnetoconductivity in a weak magnetic field. Published under license by AIP Publishing.