{'fraction_non_alphanumeric': 0.03242769500438212, 'fraction_numerical': 0.006134969325153374, 'mean_word_length': 5.106951871657754, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
An inelastic neutron scattering study of single-crystal heavy-fermion YbAgGe

Single crystals of the heavy-fermion compound YbAgGe have been studied by neutron scattering. The magnetic ordering occurring below K is characterized by a commensurate propagation vector k = (1/3,0,1/3) and the moments in the basal plane of the hexagonal structure. The dynamic magnetic susceptibility is dominated by quasielastic spin fluctuations with a characteristic energy Γq(T) of the order of 1 meV. The spins fluctuate predominantly in the basal plane. No spin-wave excitations are observed in the magnetically ordered phase. Below the Kondo temperature, K, Γq(T) shows a strong q-dependence for wavevectors along the direction, but is q-independent in the basal plane. Γq(T) initially shows a rapid increase with temperature T at the antiferromagnetic zone centre, but follows a standard law for other q values and for T>TK in general. These observations classify YbAgGe as a well-behaved heavy-fermion compound with a particular q-dependence of the antiferromagnetic spin fluctuations, possibly related to the geometrical frustration of the Y b3+ ions.