Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB6

A.V. Semenoa, M.I. Gilmanova,b, N.E. Sluchanko a, V.N. Krasnorussky a, N.Y. Shitsevalova c, V.B. Filipov c, K. Flachbart d and S.V. Demishev a aProkhorov General Physics Institute, RAS, 119991, Vavilov Str. 38, Moscow, Russia bMoscow Institute of Physics and Technology, 141700, Institutsky lane 9, Dolgoprudniy, Russia cFrantsevich Institute for Problems of Materials Science of NASU, Krzhyzhanovskii Str. 3, 03680 Kiev, Ukraine dInstitute of Experimental Physics, SAS, Watsonova Str. 47, SK-04001 Košice, Slovak Republic

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Angular dependences of ESR line parameters (g-factor and linewidth ΔH) 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) for [100]. The obtained angular dependence g(Θ) was compared with the theoretically predicted g-factor behavior for the Γ8 state of Ce3+ 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 ΔH(Θ) demonstrates that for the relevant description of experimental data the theoretical model should take into account also the interaction of Ce3+ ion with itinerant 5d electrons.

DOI: 10.12693/APhysPolA.131.1060 PACS numbers: 76.30.-v, 76.30.Kg