2-DIMENSIONAL AND 3-DIMENSIONAL CONDUCTION CHANNELS AT BLOCK BOUNDARIES IN (CDHG)TE MOSAIC CRYSTALS

Additional electronic conduction has been observed along the block bou ndaries in mosaic n-type CdxHg1-xTe crystals. Conduction along block b oundaries is two-dimensional (2D) in one group of samples and three-di mensional (3D) in another group. The main parameters of the 2D and 3D channels-electron density cyclotron mass, relaxation time, and mobilit y-were determined by analyzing the Shubnikov-de Haas oscillations. In strong magnetic fields at liquid-helium temperatures conduction occurs mainly along a network of conducting channels at block boundaries. Th e resistance of such a network of 2D channels in a 6 x 1.5 x 0.5 mm(3) sample equals approximately 110 Omega and is virtually temperature-in dependent. (C) 1998 American Institute of Physics.