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Single crystals of the heavy-fermion compound YbAgGe have been studied byneutron scattering. The magnetic ordering occurring below T1=0.5 K ischaracterized by a commensurate propagation vector k=(1/3,0,1/3) and themoments in the basal plane of the hexagonal structure. The dynamic magneticsusceptibility is dominated by quasielastic spin fluctuations with acharacteristic energy Gamma of the order of 1 meV. The spins fluctuatepredominantly in the basal plane. No spin-wave excitations are observed in themagnetically ordered phase. Below the Kondo temperature, TK=20 K, Gamma shows astrong q dependence for wave vectors along the c* direction, but isq-independent in the basal plane. Gamma shows initially a rapid increase withtemperature T at the antiferromagnetic zone center, but follows a standardsqrt(T) law for other q values and for T>TK in general. These observationsclassify YbAgGe as a well-behaved heavy-fermion compound with a particularq-dependence of the antiferromagnetic spin fluctuations, possibly related tothe geometrical frustration of the Yb3+ ions.Comment: 13 page

An inelastic neutron scattering study of single-crystal heavy-fermion YbAgGe