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Determination of the spin dynamics in UxY1-xPd3 using inelastic neutron scattering

Bull, MJ; McEwen, KA; Eccleston, RS; (1998) Determination of the spin dynamics in UxY1-xPd3 using inelastic neutron scattering. PHYS REV B , 57 (7) 3850 - 3862.

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Abstract

The crystalline electric-field (CEF) excitations in the series of UxY1-xPd3 pseudobinary compounds with x=0.45,0.37,0.28,0.20 have been measured using inelastic neutron scattering. Two excitations are found in each compound at energy transfers similar to 37 meV and similar to 3 meV that are increasingly hybridized as the uranium concentration is reduced. For U0.45Y0.55Pd3 and U0.37Y0.63Pd3, the low-energy excitation exhibits strong dispersion that is described by a singlet-singlet model of CEF excitations. The CEF parameters are determined for each compound from a comparison of calculated CEF spectra, from which the ground state of U0.45Y0.55Pd3 is deduced to be the nonmagnetic Gamma(3) doublet. With decreasing uranium concentration, the low-energy excitation moves towards zero energy transfer, leading to a ground state for U0.2Y0.8Pd3 in which the Gamma(3) doublet and Gamma(5) triplet states become degenerate. The effect of hybridization and the CEF-level scheme upon the non-Fermi-liquid characteristics of U0.2Y0.8Pd3 an discussed. [S0163-1829(98)00207-0] .

Type: Article
Title: Determination of the spin dynamics in UxY1-xPd3 using inelastic neutron scattering
Keywords: Y1-XUXPD3
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Maths and Physical Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/1309940
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