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. 2010 Jan 27;10(2):1012–1020. doi: 10.3390/s100201012

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© 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 7. — Differential conductance curve (dI/dV) as a function of voltage at 77 K (left figure). Differential resistance curve as a function of voltage at 77 K (right figure). Negative differential resistance can be seen at points a, b and c.