Magnetotransport properties of nearly-free electrons in two-dimensional hexagonal metals and application to the Mn+1AXn phases
(2015) Physical review. B, Condensed matter and materials physics — Vol. 92, n° 4, p. 045133-045131 (2015)
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- Abstract
- We propose a general, yet simple model for describing the weak field magnetotransport properties of nearly-free electrons in two-dimensional hexagonal metals. We modify this model so as to apply it to the magnetotransport properties of the Mn+1AXn phases, a particular class of nanolamellar carbides and nitrides. We argue that the values of the in-plane Hall coefficient and the in-plane parabolic magnetoresistance are due to the specific shape of the Fermi surface of almost two-dimensional hole and electron bands. If the contribution of the electron pockets to in-plane resistivity is often (but not always) predicted to be a minor one, in contrast, both holes and electrons should substantially contribute to the overall value of the in-plane Hall coefficient. The relevance of our model is supported by elementary considerations and a set of experimental data obtained from single crystals of V2AlC and Cr2AlC. In particular, we obtain a high ratio between the in-plane (ρab) and parallel to the c axis (ρc)resistivities.
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OUISSE, T., Shi, L., PIOT, B. A., Hackens, B., MAUCHAMP, V., & CHAUSSENDE, D. (2015). Magnetotransport properties of nearly-free electrons in two-dimensional hexagonal metals and application to the Mn+1AXn phases. Physical review. B, Condensed matter and materials physics, 92(4), 045133-045131. https://doi.org/10.1103/PhysRevB.92.045133 (Original work published 2015)