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Phys Rev Lett. 2007 Dec 7;99(23):237203. Epub 2007 Dec 6.

Magnetic fluctuations at a field-induced quantum phase transition.

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1
Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany.

Abstract

We report an inelastic neutron-scattering study at the field-induced magnetic quantum phase transition of CeCu5.8Au0.2. The data can be described better by the spin-density-wave scenario than by a local quantum critical point, while the latter scenario was shown to be applicable to the zero-field concentration-tuned quantum phase transition in CeCu6-xAux for x=0.1. This constitutes direct microscopic evidence for a difference in the quantum fluctuation spectra at a magnetic quantum critical point driven by different tuning parameters.

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