Low-energy excitations of Yb4As3 in a magnetic field
Max-Planck-Institut für Physik komplexer Systeme,
2 Landau Institute for Theoretical Physics, Moscow, Russia
3 Russian Federal Nuclear Center - VNNIEF, Sarov, Russia
Published online: 15 July 2000
We discuss the effects of an applied magnetic field on the low-energy excitations in the low temperature phase of Yb4As3. We show also why the magnetic interaction of the Yb3+ ions is nearly of an isotropic Heisenberg spin-1/2 type. A small anisotropy due to an intrachain dipolar interaction leads to the opening of a gap when a magnetic field is applied. The model agrees with available experimental data. Simple experiments are suggested in order to further test the present theory.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.30.Ds – Spin waves / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000