Two-Dimensional Fluctuations at the Quantum-Critical Point of CeCu6xAux

O. Stockert, H. v. Löhneysen, A. Rosch, N. Pyka, and M. Loewenhaupt
Phys. Rev. Lett. 80, 5627 – Published 22 June 1998
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Abstract

The heavy-fermion system CeCu6xAux exhibits a quantum-critical point at xc0.1 separating nonmagnetic and magnetically ordered ground states. The pronounced non-Fermi-liquid behavior at xc calls for a search for the relevant quantum critical fluctuations. Systematic measurements of the inelastic neutron scattering cross section S(q,ω) for x=0.1 reveal rodlike features in the reciprocal ac plane translating to two-dimensional (2D) fluctuations in real space. We find 3D magnetic ordering peaks for x=0.2 and 0.3 located on these rods which hence can be viewed as 2D precursors of 3D order.

  • Received 9 February 1998

DOI:https://doi.org/10.1103/PhysRevLett.80.5627

©1998 American Physical Society

Authors & Affiliations

O. Stockert1, H. v. Löhneysen1, A. Rosch2, N. Pyka3, and M. Loewenhaupt4

  • 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 3Institut Laue-Langevin, F-38042 Grenoble, France
  • 4Institut für Angewandte Physik, Technische Universität Dresden, D-01062 Dresden, Germany

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Vol. 80, Iss. 25 — 22 June 1998

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