Spin Fluctuations in the Heavy Fermion Superconductor UPd_2Al_3 Studied by Neutron Inelastic Scattering

Noriaki Sato; Naofumi Aso; Gerry H. Lander; Bertrand Roessli; Takemi Komatsubara; Yasuo Endoh

doi:10.1143/jpsj.66.1884

Abstract

We have found that there are two contributions to the dynamical response in UPd₂Al₃. 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.

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