Transport in MgB_2 near critical temperature

摘要

Longitudinal and transverse voltages have been studied on samples of MgB_2. The non-zero transverse voltage has been observed in close vicinity of critical temperature in zero external magnetic field while far enough from Tc this voltage has been zero. It merges into transverse even voltage in magnetic field which is suppressed with increasing field and increasing transport current as well. New scaling between transverse and longitudinal resistivities has been observed in the form ρ_(xy)～dρ_(xx)/dT. Several models trying to explain observed results are discussed.