Direct observation of paramagnons in palladium

Abstract

We report an inelastic neutron scattering study of the spin fluctuations in the nearly-ferromagnetic element palladium. Dispersive over-damped collective magnetic excitations or ``paramagnons'' are observed up to 128 meV. We analyze our results in terms of a Moriya-Lonzarich-type spin fluctuation model and estimate the contribution of the spin fluctuations to the low temperature heat capacity. In spite of the paramagnon excitations being relatively strong, their relaxation rates are large. This leads to a small contribution to the low-temperature electronic specific heat.

References in corpus (3)

• The strongly enhanced magnetic excitations near the quantum critical point of Cr${}_{1-x}$V${}_x$ and why strong exchange enhancement need not imply heavy fermion behavior
• Magnetism, Critical Fluctuations and Susceptibility Renormalization in Pd
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