Onset of antiferromagnetism in heavy-fermion metals

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 temperatures. The seco...

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Bibliographic Details
Published in:Nature (London) 2000-09, Vol.407 (6802), p.351-355
Main Authors: Coleman, P, Coldea, R, Adams, M, Ramazashvili, R, Löhneysen, H.v, Aeppli, G, Stockert, O, Bucher, E, Schröder, A
Format: Article
Language:English
Subjects:
Applied sciences
Condensed Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Heavy metals
Humanities and Social Sciences
Iron
letter
Low temperature
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Magnetism
Metals
Metals. Metallurgy
multidisciplinary
Physics
Science
Science (multidisciplinary)
Strongly Correlated Electrons
Transition temperatures
Valence fluctuation, kondo lattice, and heavy-fermion phenomena
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Summary: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 temperatures. 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 wave. It is at present unknown which view is appropriate at a 'quantum critical point', where the antiferromagnetic transition temperature vanishes. 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.
ISSN:0028-0836
1476-4687
DOI:10.1038/35030039