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APS » Journals » Phys. Rev. Lett. » Volume 58 » Issue 14
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Phys. Rev. Lett. 58, 1467–1470 (1987)

Magnetic excitations and ordering in the heavy-electron superconductor URu2Si2

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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

Received 9 October 1986; published in the issue dated 6 April 1987

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.

© 1987 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.58.1467
DOI:
10.1103/PhysRevLett.58.1467
PACS:
75.30.Ds, 74.70.Tx, 75.25.+z
 
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