Phonon-bottleneck enhanced magnetic hysteresis in a molecular paddle wheel complex of Ru$_2^{5+}$

Details Phonon-bottleneck enhanced magnetic hysteresis in a molecular paddle wheel complex of Ru$_2^{5+}$ Phonon-bottleneck enhanced magnetic hysteresis in a molecular paddle wheel complex of Ru$_2^{5+}$

2006-12-20

arxiv.org/abs/cond-mat/0612536v1

Appl. Phys. Lett., 89, 252502 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1063/1.2420767

The ruthenium based molecular magnet [Ru$_2$(D(3,5-Cl$_2$Ph)F)$_4$Cl(0.5H$_2$O)$\cdotp$C$_6$H$_{14}$] (hereafter Ru$_2$) behaves as a two-level system at sufficiently low temperatures. The authors performed spin detection by means of single-crystal measurements and obtained magnetic hysteresis loops around zero bias as a function of field sweeping rate. Compared to other molecular systems, Ru$_2$ presents an enhanced irreversibility as shown by ``valleys'' of negative differential susceptibility in the hysteresis curves. Simulations based on phonon bottleneck model are in good qualitative agreement and suggest an abrupt spin reversal combined with insufficient thermal coupling between sample and cryostat phonon bath.

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