Spin gap and antiferromagnetic correlations in the kondo insulator CeNiSn

T.E. Mason, G. Aeppli, A.P. Ramirez, K.N. Clausen, C. Broholm, N. Stücheli, E. Bucher, T.T.M. Palstra

    Research output: Contribution to journalJournal articleResearch


    Neutron scattering measurements show that the crossover (at T less than or similar to 10 K) from metallic heavy-fermion to semiconducting behavior coincides with the formation of a gap in the magnetic excitation spectrum of CeNiSn. In contrast to the simple band picture of an insulator, the gap is well defined only at particular values of the momentum transfer Q. While substantial antiferromagnetic correlations in the a-c plane characterize the low-T state, the corresponding zero-frequency response function is Q independent.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number3
    Pages (from-to)490-493
    Publication statusPublished - 1992

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