Spin Fluctuations in the Heavy Fermion Superconductor UPd<sub><b>2</b></sub>Al<sub><b>3</b></sub>Studied by Neutron Inelastic Scattering

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  • Sato Noriaki
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–77
  • Aso Naofumi
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–77
  • Lander Gerry H.
    European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, D–76125, Karlsruhe, Germany
  • Roessli Bertrand
    Institut Max von Laue–Paul Langevin, Grenoble, Cedex 9, France
  • Komatsubara Takemi
    Center for Low Temperature Science, Tohoku University, Sendai 980–77
  • Endoh Yasuo
    Physics Department, Graduate School of Science, Tohoku University, Sendai 980–77

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タイトル別名
  • Spin Fluctuations in the Heavy Fermion Superconductor UPd2Al3 Studied by Neutron Inelastic Scattering.
  • Spin Fluctuations in the Heavy Fermion

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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 Tc, but softens and becomes overdamped as T approaches TN. 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 Tc, and increases strongly below Tc. 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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