QUANTIZATION OF NONLINEAR CONDUCTANCE IN QUASI-ONE-DIMENSIONAL COMPOUND M-TAS3 NEAR PEIERLS TRANSITION-TEMPERATURE

The dependences of differential conductance sigma(d)(V-DC, T) on DC vo ltage V-DC and temperature T were measured in Peierls conductor m-TaS3 in the presence of strong RF-field near Peierls transition temperatur e T-P2 = 157.5 K. We observed that 1) the function sigma(d)(0, T) has a maximum at T-0 = 146.8 K in addition to the usual one at T=T-P2; 2) steps appear in the sigma(d)(V-DC)-curve at T greater than or equal to T-0. The steps are periodic both in V-DC and in sigma(d). Temperature independent magnitude of the steps is [(54 +/- 8) kOhm](-1), i.e. 4 t imes less than the quantum of ballistic conductance 2e(2)/h.