Spin Fluctuation in Heavy Fermion CeRu_2Si_2
Hiroaki Kadowaki, Masugu Sato, Shuzo Kawarazaki
TL;DR
This study uses neutron scattering to analyze spin fluctuations in the heavy-fermion compound CeRu_2Si_2, confirming the effectiveness of SCR theory and revealing long-range RKKY interactions through exchange constants.
Contribution
First comprehensive neutron scattering analysis of CeRu_2Si_2's spin fluctuations across the entire Brillouin zone, validating SCR theory and determining exchange constants.
Findings
Dynamical susceptibility well described by SCR theory
Determined fourteen exchange constants
Revealed long-range RKKY interactions
Abstract
Spin fluctuations of the archetypal heavy-fermion compound CeRu_2Si_2 have been investigated by neutron scattering in an entire irreducible Brillouin zone. The dynamical susceptibility is remarkably well described by the self-consistent renormalization (SCR) theory of the spin fluctuation in a phenomenological way, proving the effectiveness of the theory. The present analysis using the SCR phenomenology has allowed us to determine fourteen exchange constants, which show the long-range nature of the Ruderman-Kittel-Kasuya-Yosida interaction.
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