title: Inhomogeneous level splitting in Pr 2-x BixRu2O7.
abstract: We report that Bi doping drives Pr 2-x BixRu2O7 from an antiferromagnetic insulator (x = 0) to a metallic paramagnet (x approximately 1) with a broad low T maximum in C/T. Neutron scattering reveals local low energy spin excitations (variant Planck's omega approximately 1 meV) with a spectrum that is unaffected by heating to k(B)T >> variant Planck's omega. 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.
authors.affiliation: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: J
authors.initials: J
authors.lastname: van Duijn
authors.forename: K H
authors.initials: KH
authors.lastname: Kim
authors.forename: N
authors.initials: N
authors.lastname: Hur
authors.forename: D
authors.initials: D
authors.lastname: Adroja
authors.forename: M A
authors.initials: MA
authors.lastname: Adams
authors.forename: Q Z
authors.initials: QZ
authors.lastname: Huang
authors.forename: M
authors.initials: M
authors.lastname: Jaime
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: C
authors.initials: C
authors.lastname: Broholm
authors.forename: T G
authors.initials: TG
authors.lastname: Perring