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Uranium-based heavy-fermion superconductors have attracted interest because of the opportunity to study the interplay between magnetism and superconductivity. All of these materials have been round to order antiferromagnetically with T(n) > T(c) with the exception of Ube(13) in which no neutron evidence for static magnetism has been reported. In experiments on single crystals conducted at Riso National Lab., we have observed antiferromagnetic short-range magnetic correlations situated at q = <0.5,0.5,0>.Their breadth in q-space shows that the correlations are short range; while the absence of a signal in certain directions suggests that the components we observe are longitudinally polarised with respect to their propagation vector. In energy space, the correlations extend to ~2 meV and no signal is observable for T > 3OK. The remaining question concerns the energy dependence of this response around T(c).

Additional information

Authors: COAD S, Institute Laue Langevin, Grenoble (FR);HIESS ET AL, ITU Karslruhe (DE);MCMARROW D, Riso National Labs, Roskilde (DK);AEPPLI G, NEC RI, Princeton (US);FISK Z, National Magnetic Field Labs, Florida (US);STEWART G, University of Florida (US);HAYDEN S, University of Bristol (UK);MOOK H, Oak Ridge National Labs (US)
Bibliographic Reference: Article: Physica B 276-278 (2000) pp:764-765; Oral Report: European Conference on Neutron Scattering ECNS Budapest (HU), 1-4 September, 1999
Availability: 1 as paper EN 60456 ORA
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