Proximity effect-induced superconductivity and NMR relaxation in Nb-Cu multilayers

Guo-Qing Zheng, Yoshio Kitaoka, Yasukage Oda, Kunisuke Asayama, Yoshihisa Obi, Hiroyasu Fujimori, Ryozo Aoki

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The nuclear spin lattice relaxation rate, T1-l, for 63Cu in zero field from 8 K down to 0.3 K, has been measured in Nb-Cu multilayered thin films where both the Nb- and Cu-layer thicknesses are much smaller compared to the coherence lengths. A BCS- like temperature dependence of T1-1 replaced gradually by a Korringa-law-like one at low temperatures has been found. A dependence of the relaxation on the Cu-layer thickness at low temperatures has also been found. It has been proposed and confirmed by a series of experiments that superconductivity in the Cu-layer induced by the proximity effect has an anisotropic energy gap, reflecting the geometrical feature of a thin film.

Original languageEnglish
Pages (from-to)599-607
Number of pages9
JournalJournal of the Physical Society of Japan
Volume60
Issue number2
Publication statusPublished - Feb 1991
Externally publishedYes

Fingerprint

superconductivity
nuclear magnetic resonance
thin films
spin-lattice relaxation
nuclear spin
temperature dependence

Keywords

  • Cu NMR
  • Energy gap
  • Nb-Cu
  • Spin-lattice relaxation rate
  • Superconducting multilayers
  • Superconducting proximity effect

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Zheng, G-Q., Kitaoka, Y., Oda, Y., Asayama, K., Obi, Y., Fujimori, H., & Aoki, R. (1991). Proximity effect-induced superconductivity and NMR relaxation in Nb-Cu multilayers. Journal of the Physical Society of Japan, 60(2), 599-607.

Proximity effect-induced superconductivity and NMR relaxation in Nb-Cu multilayers. / Zheng, Guo-Qing; Kitaoka, Yoshio; Oda, Yasukage; Asayama, Kunisuke; Obi, Yoshihisa; Fujimori, Hiroyasu; Aoki, Ryozo.

In: Journal of the Physical Society of Japan, Vol. 60, No. 2, 02.1991, p. 599-607.

Research output: Contribution to journalArticle

Zheng, G-Q, Kitaoka, Y, Oda, Y, Asayama, K, Obi, Y, Fujimori, H & Aoki, R 1991, 'Proximity effect-induced superconductivity and NMR relaxation in Nb-Cu multilayers', Journal of the Physical Society of Japan, vol. 60, no. 2, pp. 599-607.
Zheng, Guo-Qing ; Kitaoka, Yoshio ; Oda, Yasukage ; Asayama, Kunisuke ; Obi, Yoshihisa ; Fujimori, Hiroyasu ; Aoki, Ryozo. / Proximity effect-induced superconductivity and NMR relaxation in Nb-Cu multilayers. In: Journal of the Physical Society of Japan. 1991 ; Vol. 60, No. 2. pp. 599-607.
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AU - Fujimori, Hiroyasu

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