Abstract
An enhanced susceptibility is a natural consequence of the “heavy fermion” (HF) state, rendering the possibility of measurably large nonlinear susceptibilities. In recent work a universal behavior of the peaks observed in the linear () and the third-order () susceptibility in HF metamagnets has been identified. This universality is well accounted for by a single energy scale model considering on-site correlations only. A prediction of this model is a peak in the fifth-order susceptibility as well. In measurements on a HF metamagnet, , reported herein, we find that , rather than attaining a peak, saturates at low temperatures and is positive. The thermodynamic implications of these towards the stability of the metamagnetic HF state are discussed.
- Received 24 December 2013
DOI:https://doi.org/10.1103/PhysRevB.89.161108
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