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

Abstract

The ruthenium based molecular magnet [Ru${}_2$(D(3,5-Cl${}_2$Ph)F)${}_4$Cl(0.5H${}_2$O)$\cdot$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.

4 pages, 3 figures

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Cited by in corpus (4)

• On-chip SQUID measurements in the presence of high magnetic fields
• Spin transition in Gd${}_3$N@C${}_{80}$, detected by low-temperature on-chip SQUID technique
• Coherent spin rotation in the presence of a phonon-bottleneck effect
• Anisotropy of the molecular magnet V${}_{15}$ spin Hamiltonian detected by high-field electron spin resonance