Crystal-field spectroscopy of tetragonal lanthanide single-ion magnets
In this experiment we intend to study crystal-field excitations in perfectly tetragonal dysprosium and erbium single-ion magnets. We have been able to synthesize a system with square antiprismatic geometry, and one where we have twisted the prism around the fourfold axis towards a geometry in-between cubic and square antiprismatic. Using alternating current magnetic susceptibility measurements we have determined that this twist greatly influences the anisotropy barrier of the system. This barrier is governed by the crystal-field splitting, and to gain insight on the processes responsible for the relaxation of the magnetization, we want to probe this splitting by means of inelastic neutron scattering. Through comparison with the isostructural diamagnetic yttrium compounds we will discriminate between phonons and magnetic excitations.
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Mikkel A. Sørensen; BENDIX Jesper; HANSEN Ursula Bengaard; LEFMANN Kim and MUTKA Hannu. (2015). Crystal-field spectroscopy of tetragonal lanthanide single-ion magnets. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-04-468
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