Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Bio- and Molecular Magnetism II
MA 21.2: Vortrag
Dienstag, 15. März 2011, 11:15–11:30, HSZ 401
Spin coherence and relaxation in Mn-dimer magnetic clusters — •Y. Krupskaya1, R. Zaripov2, E. Vavilova1,2, V. Miluykov3, I. Bezkishko3, D. Krivolapov3, O. Kataeva3, O. Sinyashin3, E. Hey-Hawkins4, V. Voronkova2, K. Salikhov2, V. Kataev1, and B. Büchner1 — 1IFW Dresden, Dresden, Germany — 2Zavoisky Physical-Technical Institute of the RAS, Kazan, Russia — 3A.E. Arbuzov Institute of Organic and Physical Chemistry of the RAS, Kazan, Russia — 4Institute of Inorganic Chemistry, Leipzig University, Leipzig, Germany
We present a pulsed ESR study of Mn-dimer molecular complexes which show strong dependence of magnetic properties on the ligand surrounding. The complexes were studied as microcrystalline powders and, in addition, as frozen solutions (dissolved in tetrahydrofurane). An electron spin echo in these complexes was detected and the relaxation times T1 (spin-lattice relaxation) and T2 (phase-coherence) were determined. We observe a simple exponential T2 relaxation in the case of dissolved samples and two-component relaxation process in powders. Interestingly, we also observe an electron spin echo envelope modulation (ESEEM) associated with the coupling of the Mn electron spins to nearby proton moments. We discuss the nature of the observed relaxation processes and in particular the role of the intermolecular Mn-Mn relaxation.