Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Bio- and Molecular Magnetism
MA 27.4: Vortrag
Donnerstag, 28. Februar 2008, 15:15–15:30, EB 202
Pulsed W-Band ESR studies on Cr7Ni — •Christoph Schlegel1, Joris van Slageren1,2, Hans-Jürgen Kümmerer3, Gert Denninger3, Richard E. P. Winpenny4, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — 2School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom — 32. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — 4Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
For quantum information processing sufficiently long coherence times of the employed system are necessary. Molecular magnets are potential systems for the realization of quantum bits. Both spin-lattice and spin-spin relaxation times of Cr7NiF8Piv16 were measured with a pulsed W-Band spectrometer. The measurements were performed on diluted frozen solutions, because in Cr7Ni crystals dipolar interactions lead to very short coherence times. At 5 K and a concentration of 0.2 mg/ml, T1 was determined to be 2300 ns, while T2 was measured to be 357 ns, which is comparable to literature values. [1] To improve the coherence times, it is necessary to understand the decoherence mechanism. One of the decoherence pathways is through coupling with the nuclear spins. With pulsed ENDOR the hyperfine coupling of the electron spin to the nuclear spin of the protons could be quantified to -0.8 MHz in a 1 mg/ml solution. Surprisingly, no coupling to the nuclear spin of fluorine could be found.
[1] A. Ardavan et al., Phys. Rev. Lett. 98, 057201 (2007)