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Lecture S. Nakamae


17 January 2005 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. S. Nakamae
Affiliation: ESPCI, France
Title: Intrinsic low-temperature paramagnetism in B-DNA
Date: Mon Jan 17, 2005
Start: 11.00
Location: FWN-Building 5116.0116
Host: B.J. van Wees
Telephone: +31 50 363 4933 / 4974


The electrical conduction through DNA remains controversial spanning from insulator, semi-conductor, metal to proximity-induced superconductor. Such variance illustrates the complexity of interactions between DNA and their environment, i.e. buffer solutions, electrodes, as well as more internal factors such as molecular structures and base-pair sequences. Magnetization is an alternative, non-invasive mean to probe the intrinsic electronic properties of matter, as the measurements do not require any electrode attachments. In this talk, the experimental results on the magnetization combined with simultaneous structural measurements via micro-Raman on lambda-DNA molecules will be presented. In the B-DNA state, surprisingly, the magnetization of lambda-DNA molecules exhibits paramagnetic behavior below 20 K that is non-linear in applied magnetic field. This low-temperature paramagnetic effect was found to disappear in A-DNA, demonstrating the interplay between the molecular structures (A- and B-DNA) and the magnetic property. The possible orbital origin of this magnetism as well as its relation to the existence of long-range coherent transport in B-DNA at low temperature will be discussed.
Last modified:22 October 2012 2.30 p.m.