Abstract
In order to directly observe neutron scattering by heavy fermion quasiparticles at low temperatures, a CeRu2Si2 single crystal has been studied by the small-angle neutron scattering method. In the experiment, neutron scattering is observed at T = 0.85 K for momentum transfers q ≤ 0.04 Å−1, which is treated as the orbital component of magnetic scattering by heavy fermion quasiparticles. It has been found that the application of a magnetic field H = 1 T leads to both an increase in the observed scattering and its anisotropy with respect to the field direction. Moreover, measurements in the magnetic field reveal additional scattering for q > 0.04 Å−1, which is well described by a Lorentzian and is interpreted as neutron magnetic scattering by spin-density fluctuations with a correlation radius R c ≈ 30 Å.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 81, No. 11, 2005, pp. 688–692.
Original Russian Text Copyright © 2005 by Kopitsa, Grigoriev, Runov, Maleyev, Garamus, Yashenkin.
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Kopitsa, G.P., Grigoriev, S.V., Runov, V.V. et al. Study of the heavy-fermion compound CeRu2Si2 by the small-angle neutron scattering method. Jetp Lett. 81, 556–560 (2005). https://doi.org/10.1134/1.2029943
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DOI: https://doi.org/10.1134/1.2029943