Linear specific heat of an amorphous magnet due to single-ion excitations

Abstract
The specific heat of an amorphous Dy-Cu alloy includes a large linear contribution (γ = 155 mJ/mole K2) at temperatures well below the sharp spin-freezing transition at Tf = 18 K. This can be simply explained in terms of single-ion excitations of a Kramers ion interacting with a random oriented crystal field and a weaker magnetic field

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