Magnetic excitations and ordering in the heavy-electron superconductor URu2Si2

C. L. Broholm, J.K. Kjems, W.J.L. Buyers, P. Matthews, T.T.M. Palstra, A. A. Menovsky, J.A. Mydosh

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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.
Original languageEnglish
Pages (from-to)1467-1470
Number of pages4
JournalPhysical review letters
Issue number14
Publication statusPublished - 6 Apr 1987
Externally publishedYes


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