Anomalous Anderson Weak Localization of Graphite Thin Film Fabricated by Plasma-Enhanced Chemical Vapor Deposition

概要

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The conductivity and magnetoresistance of graphite thin film (GTF), fabricated by plasma-enhanced chemical vapor deposition (PECVD), were investigated. Below 100 K, the conductivity was proportional to $\log T$, and the transverse magnetoresistance (MR) was negative, whereas the longitudinal MR was small, but positive. The conductivity and magnetoresistance results are well-described by weak-localization theory, applied to a two-dimensional disordered system. The carrier dephasing length ($L_{\varepsilon}$), which was estimated from the transverse MR, varied as $T^{- p}$ ($ p = 0.05--0.11$). This $ p$ value is an order of magnitude smaller than that of electron–electron interaction derived from Fermi liquid theory ($ p = 1$). This small $ p$ value strongly suggests that the electronic state of GTF is different from that of typical graphite.
Physical Society of Japanの論文
2010-05-15