Author
Listed:
- A. Schröder
(Physikalisches Institut, Universität Karlsruhe)
- G. Aeppli
(NEC)
- R. Coldea
(Oak Ridge National Laboratory
ISIS Facility, CCLRC, Rutherford-Appleton Laboratory)
- M. Adams
(ISIS Facility, CCLRC, Rutherford-Appleton Laboratory)
- O. Stockert
(Physikalisches Institut, Universität Karlsruhe
University of Bristol)
- H.v. Löhneysen
(Physikalisches Institut, Universität Karlsruhe)
- E. Bucher
(University of Konstanz
Bell Laboratories, Lucent Technologies)
- R. Ramazashvili
(University of Illinois)
- P. Coleman
(Center for Materials Theory, Rutgers University)
Abstract
There are two main theoretical descriptions of antiferromagnets. The first arises from atomic physics, which predicts that atoms with unpaired electrons develop magnetic moments. In a solid, the coupling between moments on nearby ions then yields antiferromagnetic order at low temperatures1. The second description, based on the physics of electron fluids or ‘Fermi liquids’, states that Coulomb interactions can drive the fluid to adopt a more stable configuration by developing a spin density wave2,3. It is at present unknown which view is appropriate at a ‘quantum critical point’, where the antiferromagnetic transition temperature vanishes4,5,6,7. Here we report neutron scattering and bulk magnetometry measurements of the metal CeCu6-xAux, which allow us to discriminate between the two models. We find evidence for an atomically local contribution to the magnetic correlations which develops at the critical gold concentration (xc = 0.1 ), corresponding to a magnetic ordering temperature of zero. This contribution implies that a Fermi-liquid-destroying spin-localizing transition, unanticipated from the spin density wave description, coincides with the antiferromagnetic quantum critical point.
Suggested Citation
A. Schröder & G. Aeppli & R. Coldea & M. Adams & O. Stockert & H.v. Löhneysen & E. Bucher & R. Ramazashvili & P. Coleman, 2000.
"Onset of antiferromagnetism in heavy-fermion metals,"
Nature, Nature, vol. 407(6802), pages 351-355, September.
Handle:
RePEc:nat:nature:v:407:y:2000:i:6802:d:10.1038_35030039
DOI: 10.1038/35030039
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