Scaling of magnetic fluctuations near a quantum phase transition

A. Schröder, G. Aeppli, E. Bucher, R. Ramazashvili, P. Coleman

    Research output: Contribution to journalJournal articleResearch

    Abstract

    We use inelastic neutron scattering to measure the magnetic fluctuations in a single crystal of the heavy fermion alloy CeCu5.9Au0.1 close to the antiferromagnetic quantum critical point. The energy (E), wave vector (Q), and temperature (T) dependent spectra obey E/T scaling at Q near (1,0,0). The neutron data and earlier bulk susceptibility are consistent with the form chi(-1) similar to f(Q) + (-iE + aT)(alpha), with an anomalous exponent alpha approximate to 0.8 not equal 1. We confirm the earlier observation of quasilow dimensionality and show how both the magnetic fluctuations and the thermodynamics can be understood in terms of a quantum Lifshitz point.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume80
    Issue number25
    Pages (from-to)5623-5626
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1998

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