Two-dimensional fluctuations at the quantum-critical point of CeCu_{6-x}Au_x

Details Two-dimensional fluctuations at the quantum-critical point of CeCu_{6-x}Au_x Two-dimensional fluctuations at the quantum-critical point of CeCu_{6-x}Au_x

1998-02-09

arxiv.org/abs/cond-mat/9802086v1

Phys. Rev. Lett., 80 (1998), 5627

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures included

Scientific paper

10.1103/PhysRevLett.80.5627

The heavy-fermion system CeCu_{6-x}Au_x exhibits a quantum critical point at x_c = 0.1 separating nonmagnetic and magnetically ordered ground states. The pronounced non-Fermi-liquid behavior at x_c calls for a search for the relevant quantum critical fluctuations. Systematic measurements of the inelastic neutron scattering cross section S(q,omega) for x = 0.1 reveal rod-like 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 the 3d order.

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