论文信息 - Surface conductivity of n-type Hg0.8Cd0.2 in high magnetic fields

Surface conductivity of n-type Hg0.8Cd0.2 in high magnetic fields

The longitudinal magneto-conductivity of n-Hg0.8Cd0.2Te is activated at low temperatures (T or approximately=1 T). Anomalous behaviour of the sample conductivity has been found within the activated region where the bulk conductivity decreases up to 4 orders of magnitude. The authors have investigated this anomalous behaviour using samples of different dimensions coming from two manufacturers. Using the general layer model of Petritz (1958), the observed deviations could be related to a surface layer with a temperature independent conductivity. This surface layer with a specific surface conductance of approximately=10-3 Omega -1 shunts the thermally activated bulk conductivity. Besides the sample conductivity the nonlinear hot carrier current/voltage characteristic is strongly affected by the surface layer.

J. Ziegler | G. Nimtz | J. Stadler | H. Maier

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