Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.4: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Rare-earths-based single molecule magnets and single chain magnets — •Sabrina Haas1, Conrad Clauss1, Sina Zapf1, Javier Luzon2, Boris Gorshunov1,3, Roberta Sessoli2, Martin Dressel1, and Lapo Bogani1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Dipartimento di Chimica e sezione INSTM, Universita degli Studi di Firenze, Italy — 3Prokhorov Institute of General Physics, Russian Academy of Sciences, Russia
The field of molecular magnetism has allowed the observation of several interesting quantum effects. Much is nowadays known of molecular magnets made of transition metal ions but, when moving to rare-earth building blocks, little can be said, due to the complexity of such systems.
We focus in our study on the monomeric compound
[Dy(hfac)3NIT(C6H4OPh)2] and its one-dimensional counterpart [Dy(hfac)3NIT(C6H4OPh)]∞. These are among the most complex systems, due to the complete lack of symmetries both in the molecule and in the crystal lattice. We show that [Dy(hfac)3NIT(C6H4OPh)2] shows slow relaxation of the magnetization and zero-field quantum tunnelling assisted by the nuclear spin. In particular we rely on a combined use of Frequency-domain magnetic resonance spectroscopy with backward wave oscillators and Fourier transform infrared spectroscopy, spanning a frequency range from 4 to 100 cm−1. The results are compared to those obtained from ac susceptibility data and static magnetic measurements. All results are eventually compared with theoretical values obtained by CASSCF calculations.