Direct observation of paramagnons in palladium

R. Doubble; S. M. Hayden; Pengcheng Dai; H. A. Mook; J. R. Thompson; C. D. Frost

doi:10.1103/PhysRevLett.105.027207

Direct observation of paramagnons in palladium

Strongly Correlated Electrons 2010-09-27 v1

Authors: R. Doubble , S. M. Hayden , Pengcheng Dai , H. A. Mook , J. R. Thompson , C. D. Frost

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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.

Keywords

paramagnons palladium inelastic neutron scattering spin fluctuations heat capacity

Cite

@article{arxiv.1005.4402,
  title  = {Direct observation of paramagnons in palladium},
  author = {R. Doubble and S. M. Hayden and Pengcheng Dai and H. A. Mook and J. R. Thompson and C. D. Frost},
  journal= {arXiv preprint arXiv:1005.4402},
  year   = {2010}
}

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