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Quantum Tunnelling of the Magnetisation in Single-Molecule Magnet Isotopologue Dimers

Abstract

Quantum tunnelling of the magnetisation plays a major role in the magnetic properties of lanthanide Single-Molecule Magnets: while it is considered a problem for data storage device applications since it leads to information loss, it is an essential pre-requisite for the read-out and manipulation of the nuclear states in Quantum Information Processing schemes. Here we describe two isotopologue dysprosium dimers, i.e. [(163Dy(tmhd)3)2(bpym)] and [(164Dy(tmhd)3)2(bpym)] (tmd = tris(tetramethylheptanedionato) and bpym = bipyrimidine), where the nuclear spin presence or absence clearly affects the magnetic properties of the systems. Through μ-SQUID studies at milli-Kelvin temperatures and alternating current magnetic measurements, we find significant differences in the magnetic behaviour of both complexes. While simulation of the hysteresis loops at 30 mK shows that the presence of nuclear spin does not influence the tunnelling rate, we find that it facilitates the coupling to the phonon bath enhancing the direct relaxation process; observation reflected in the temperature and field dependence of the relaxation rates.

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Publication details

The article was received on 02 Mar 2019, accepted on 12 Apr 2019 and first published on 15 Apr 2019


Article type: Edge Article
DOI: 10.1039/C9SC01062A
Citation: Chem. Sci., 2019, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Quantum Tunnelling of the Magnetisation in Single-Molecule Magnet Isotopologue Dimers

    E. Moreno-Pineda, G. Taran, W. Wernsdorfer and M. Ruben, Chem. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C9SC01062A

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