NMR Study of the Proximity Effect in Nb–Cu Multilayers

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  • Zheng Guo-qing
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Kohori Yoh
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Oda Yasukage
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Asayama Kunisuke
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Aoki Ryozo
    Department of Physics, Faculty of Science, Kyushu University
  • Obi Yoshihisa
    Research Institute for Iron, Steel and other Metals, Tohoku University
  • Fujimori Hiroyasu
    Research Institute for Iron, Steel and other Metals, Tohoku University

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  • NMR Study of the Proximity Effect in Nb

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A series of measurements on the nuclear spin-lattice relaxation rate, T1−1, of 63Cu in superconducting multilayer Nb–Cu has been performed over a temperature range from 4.2 K down to 0.3 K, using the field cycling method. T1−1 decreases rapidly after an initial increment just below Tc. At low temperatures, however, the rate of the decrease slows down, and T1−1 decreases in proportion to temperature. It has been concluded that such behavior of T1−1 originates from a distribution of the energy gap of the Cooper pairs in Cu. The electrons which are propagated nearly normal to the S–N interface have a finite energy gap predicted by McMillan, while the electrons propagated nearly parallel to the interface are gapless and behave like normal electrons.

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