Two routes to metallic behavior for a Kondo insulator

Details Two routes to metallic behavior for a Kondo insulator Two routes to metallic behavior for a Kondo insulator

1996-11-18

arxiv.org/abs/cond-mat/9611132v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 5 postscript figures, Submitted the Physical Review Letters

Scientific paper

Cold neutron spectroscopy was performed on CeNi_{1-x}Cu_xSn to investigate how the magnetic gap in the 'Kondo insulator' CeNiSn is destroyed by temperature (T), chemical substitution (x), and external magnetic field. Upon doping, the spin gap collapses and magnetic Bragg peaks occur initially (x = 0.13) at the commensurate wave vectors Q = (0,m/2,l) (m,l integer) where the higher-energy (4.1 meV) gap is located for x = 0. A magnetic field smooths the sharp spin gap structure in both momentum and energy, while leaving the associated static susceptibility unchanged, as does raising T.

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