Direct Observation of Paramagnons in Palladium

R. Doubble, S. M. Hayden, Pengcheng Dai, H. A. Mook, J. R. Thompson, and C. D. Frost
Phys. Rev. Lett. 105, 027207 – Published 9 July 2010

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.

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  • Received 20 May 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.027207

©2010 American Physical Society

Authors & Affiliations

R. Doubble1, S. M. Hayden1,*, Pengcheng Dai2,3, H. A. Mook3, J. R. Thompson2,3, and C. D. Frost4

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
  • 2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
  • 3Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United Kingdom
  • 4ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom

  • *s.hayden@bris.ac.uk

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Vol. 105, Iss. 2 — 9 July 2010

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