Inhomogeneous level splitting in Pr2-xBixRu2O7

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Title: Inhomogeneous level splitting in Pr2-xBixRu2O7
Author: van Duijn, J.; Kim, K.H.; Hur, N.; Adroja, D.; Adams, M.A.; Huang, Q.Z.; Jaime, M.; Cheong, S.-W.; Broholm, C.; Perring, T.G.
Abstract: 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.
Date: 2005-05-06
Citation: Physical Review Letters, vol. 94, Issue 17, id. 177201
Subject: paramagnetic materials
praseodymium compounds
neutron diffraction
metal-insulator transition
antiferromagnetic insulato
Bi doping
metallic paramagnet
bismuth compounds
antiferromagnetic materials
neutron scattering
local low energy spin excitations
nonKramers ground-state doublet
lattice strain

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