The influences of the second harmonics together with the asymmetries of junctions on the voltage-current characteristics of high TC DC SQUIDs

► We defined two stationary density probability currents for a DC SQUID. ► We proved that the measurable total voltage is in proportion to sum of them. ► The alone asymmetry or the alone second harmonic considerations are inadequate. ► Jointly considerations can lead to the reduction of maximum voltage modulation. ► Also the increase of biasing current that provides it.