Wave-vector– and magnetic-field–dependent spin fluctuations in the heavy-fermion system <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">CeCu</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow></math>

G. Aeppli; H. Yoshizawa; Y. Endoh; E. Bucher; J. Hufnagl; Y. Onuki; T. Komatsubara

doi:10.1103/PhysRevLett.57.122

Wave-vector– and magnetic-field–dependent spin fluctuations in the heavy-fermion system ${CeCu}_{6}$

G. Aeppli, H. Yoshizawa, Y. Endoh, E. Bucher, J. Hufnagl, Y. Onuki, and T. Komatsubara

Phys. Rev. Lett. 57, 122 – Published 7 July 1986

Abstract

We have performed neutron-scattering measurements on a single crystal of ${CeCu}_{6}$ in applied magnetic fields from 0 to 6.4 T. The observed momentum-dependent magnetic scattering implies the existence of short-range antiferromagnetic correlations. While it induces no resonances, the field broadens the spectra considerably at T=0.4 K. An effective Hamiltonian which incorporates both single-impurity Kondo properties and antiferromagnetic Ruderman-Kittel-Kasuya-Yosida interactions describes our data.