Tuesday, January 15, 2013

1301.2727 (L. Casparis et al.)

Evidence for Disorder Induced Delocalization in Graphite    [PDF]

L. Casparis, D. Hug, D. Kölbl, D. M. Zumbühl
We present electrical transport measurements in natural graphite and highly ordered pyrolytic graphite (HOPG), comparing macroscopic samples with exfoliated, nanofabricated specimen of nanometer thickness. Nano-samples exhibit a very large c-axis resistivity \rho_c - much larger than expected from simple band theory - and non-monotonic temperature dependence, similar to macroscopic HOPG, but in stark contrast to macroscopic natural graphite. A recent model of disorder induced delocalization is consistent with the data. Micro-Raman spectroscopy reveals clearly reduced disorder in exfoliated samples and HOPG, as expected within the model - therefore presenting further evidence for a novel paradigm of electronic transport in graphite.
View original: http://arxiv.org/abs/1301.2727

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