Weak electronic anisotropy in the layered nanolaminate Ti2GeC

We have investigated the anisotropy in electronic transport of the layered ternary Ti2GeC by comparing the results of measurements on c-axis oriented epitaxial thin-film and polycrystalline bulk samples. The electrical conductivities, Hall coefficients, and magnetoresistances were analyzed within a multi-band framework. An adequate description of the magnetotransport data on the film with the highest mobility required the use of the explicit field-dependent conductivity tensor with three conduction bands. The analysis indicated that n approximate to p, although with n approximate to 3.5 x 10(27) m(-3). The ratio of the a- to c-axis conductivities is small and contrary to theoretical predictions. (C) 2008 Elsevier Ltd. All rights reserved.