Single-ion anisotropy and magnetic field response in the spin-ice materials Ho2Ti2 O7 and Dy2Ti2 O7
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Abstract
Motivated by its role as a central pillar of current theories of dynamics of
spin ice in and out of equilibrium, we study the single-ion dynamics of the
magnetic rare earth ions in their local environments, subject to the effective
fields set up by the magnetic moments they interact with. This effective field
has a transverse component with respect to the local easy-axis of the crystal
electric field, which can induce quantum tunnelling. We go beyond the
projective spin-1/2 picture and use instead the full crystal-field Hamiltonian.
We find that the Kramers vs non-Kramers nature, as well as the symmetries of
the crystal-field Hamiltonian, result in different perturbative behaviour at
small fields (
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1550-235X
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Engineering and Physical Sciences Research Council (EP/K028960/1)