QUANTUM TRANSPORT IN ULTRATHIN COSI2 POLYCRYSTALLINE FILMS

Quantum transport in ultrathin CoSi2 polycrystalline films was studied for the first time. The temperature corrections to the conductivity o f these films and their anomalous magnetoresistance have been observed and investigated. It is shown that they are determined by the effects of interaction and weak localization with the strong spin-orbit and s pin scattering taken into account. Unlike the epitaxial crystalline fi lms reported previously our films including one with the thickness lar ger than 10 nm show no superconductivity down to the lowest temperatur e (0.2 K). In the thinnest film we used an unusual dimensional crossov er from one dimensional behavior of quantum corrections to two dimensi onal have been observed with lowering temperature, supposedly due to c hanges of the characteristic correlation length in the sample, which c onsisted of meandrous conducting paths caused by the presence of pin-h oles. (C) 1997 Published by Elsevier Science Ltd.