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Spin Fluctuations in the Heavy Fermion Superconductor UPd 2 Al 3 Studied by Neutron Inelastic Scattering

1997; Physical Society of Japan; Volume: 66; Issue: 7 Linguagem: Inglês

10.1143/jpsj.66.1884

1347-4073

Noriaki Sato, Naofumi Aso, G. H. Lander, B. Roessli, Takemi Komatsubara, Y. Endoh,

Physics of Superconductivity and Magnetism

We have found that there are two contributions to the dynamical response in UPd 2 Al 3 . The first is a heavily damped spin-wave, which has been observed previously. It shows no appreciable change on warming through T c , but softens and becomes overdamped as T approaches T N . The second is a quasielastic-like component that exists in the antiferromagnetically ordered state and is strongly localized around the ordered wavevector. As a function of temperature this component exhibits a minimum at the superconducting transition temperature T c , and increases strongly below T c . Its width in the momentum space at T = 0.5 K corresponds to a correlation length of ∼50 Å, which is close to the superconducting coherence length of ∼85 Å.