Inhomogeneous level splitting in Pr2-xBixRu2O7
van Duijn, J.
Kim, K. H.
Adams, M. A.
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We report that Bi doping drives Pr2-xBixRu2O7 from an antiferromagnetic insulator (x=0) to a metallic paramagnet (x≈1) with a broad low T maximum in C/T. Neutron scattering reveals local low energy spin excitations (ℎω≈1 meV) with a spectrum that is unaffected by heating to kBT>>ℎω. We show that a continuous distribution of splittings of the non-Kramers Pr3+ ground-state doublet such as might result from various types of lattice strain can account for all the data.