Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB6

A.V. Semeno, M.I. Gilmanov, N.E. Sluchanko, V.N. Krasnorussky, N.Y. Shitsevalova, V.B. Filipov, K. Flachbart, S.V. Demishev
2017 Acta Physica Polonica. A  
Angular dependences of ESR line parameters (g-factor and linewidth ∆H) were experimentally explored in the antiferroquadrupolar phase of heavy fermion system CeB6 at T = 1.8 K. The data were obtained in two experimental geometries with different mutual directions of the wavevector k and the external magnetic field H at frequency of f = 60 GHz. A g-factor anisotropy was found: while g-factors for [110] and [111] directions are close to each other (g ≈ 1.6), it is considerably higher (g ≈ 1.75)
more » ... r [100]. The obtained angular dependence g(Θ) was compared with the theoretically predicted g-factor behavior for the Γ8 state of Ce 3+ ion in antiferroquadrupolar phase of CeB6. It turns out that the experimental g-factor is considerably smaller at all angles than the theoretically calculated limits (2 < g < 2.2) and, moreover, it has a different symmetry. This result together with the strong linewidth anisotropy ∆H(Θ) demonstrates that for the relevant description of experimental data the theoretical model should take into account also the interaction of Ce 3+ ion with itinerant 5d electrons.
doi:10.12693/aphyspola.131.1060 fatcat:37n5ndzjmbchvhxm6i4usnwhke