Characteristic energy scales in CePdAl

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Abstract

We report on inelastic neutron scattering experiments that were carried out on single-crystalline CePdAl, which is a heavy fermion system with hexagonal crystal structure and is close to an antiferromagnetic quantum critical point. The measurements yield information on the crystalline-electric-field (CEF) excitations and quasielastic spin fluctuations. Two excited CEF levels have been detected at ≈240 K and >400 K. A broad quasielastic magnetic signal could be observed, yielding a Kondo temperature TK = 5 K that agrees with the result from thermodynamic measurements.

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