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The heavy fermion superconductor Upd(2)Al(3) exhibits the unusual combination of an antiferromagnetic phase transition, at T(N)=14.3 K, followed by a superconducting phase transition below 2 K without destruction of the ordered magnetic moment. Polarized inelastic neutron scattering reveals the presence of two coupled modes both transverse to the sub-lattice inelastic response. We show that it is reasonable to consider the superconducting state as arizing out of interactions between quasiparticles which are strongly renormalized by the low frequency exchange field.

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Authors: BERNHOEFT N, Institut Laue Langevin, Grenoble (FR);HEISS A, Institut Laue Langevin, Grenoble (FR);SATO N, Tohoku University, Sendai (JP);ASO N, Tohoku University, Sendai (JP);ENDOH Y, Tohoku University, Sendai (JP);KOMATSUBARA T, Tohoku University, Sendai (JP);ROESSLI B, ETH Zurich (CH);LANDER G H, ITU Karlsruhe (DE)
Bibliographic Reference: Article: Physical Review Letters, 1998
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