Magnetic excitations and ordering in the heavy-electron superconductor URu2Si2

C. Broholm, J. K. Kjems, W. J. L. Buyers, P. Matthews, T. T. M. Palstra, A. A. Menovsky, and J. A. Mydosh
Phys. Rev. Lett. 58, 1467 – Published 6 April 1987
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Abstract

Neutron scattering demonstrates the coexistence of antiferromagnetic order and superconductivity below 1 K in the heavy-electron system URu2Si2. It is found that the upper (17.5 K) transition is to an antiferromagnetic phase with a (100) modulation wave vector and spins along the tetragonal c-axis. The ordered moment is unusually small, (0.03±0.01)μB. However, spin waves develop from damped, finite-gap excitations above TN, and they are intense, propagating, and longitudinal with a zone centre gap of 1.8 meV.

  • Received 9 October 1986

DOI:https://doi.org/10.1103/PhysRevLett.58.1467

©1987 American Physical Society

Authors & Affiliations

C. Broholm and J. K. Kjems

  • Riso National Laboratory, DK-4000 Roskilde, Denmark

W. J. L. Buyers and P. Matthews

  • Atomic Energy of Canada Limited, Chalk River, Ontario, Canada K0J6 1J0

T. T. M. Palstra, A. A. Menovsky, and J. A. Mydosh

  • Kamerlingh Onnes Laboratorium, 2300 RA Leiden, The Netherlands

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Vol. 58, Iss. 14 — 6 April 1987

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