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Superconductivity of Regular and Fibonacci Mo/V Superlattices

  • C. W. Hagen
  • R. Griessen
  • D. G. de Groot
  • Ø. Fischer
  • M. G. Karkut

Abstract

Regular and Fibonacci Mo/V superlattices were epitaxially grown by magnetic sputtering under ultra high vacuum conditions on (1120) Al2O3 substrates held at ≈1000 K during deposition [1,2]. The upper critical field determined from magnetic torque as well as resistivity measurements are investigated as a function of temperature and magnetic field orientation and for various modulations of the proximity-coupled superconducting multilayer. For small modulation lengths Λ (Λ = 19.1 and 16.3 nm for the regular and Fibonacci sequence, respectively) a three-dimensional behavior of the superconducting multilayer is observed with a zero-temperature coherence length ξ ≈ 21 nm and an anisotropy Hc2∥/Hc2⊥ ≈ 2. For multilayers with large modulation lengths (Λ ≈ 64.4 nm) a peculiar temperature dependence is revealed in Hc2∥, which is attributed to dimensional crossovers similar to those described theoretically by Takahashi and Tachiki [3]. Due to the complexity of our multilayer structure dimensionality features occur at different temperatures. If ξ equals the thinnest V layer thickness, a commensurability between the vortex lattice and the multilayer exists.

Keywords

Critical Field Vortex Lattice Torque Measurement Fibonacci Sequence Magnetic Torque 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    M.G. Karkut, D. Ariosa, J.-M. Triscone, Ø. Fischer: Phys. Rev. B 32, 4800 (1985)ADSCrossRefGoogle Scholar
  2. 2.
    M.G. Karkut, J.-M. Triscone, D. Ariosa, Ø. Fischer: Phys. Rev. B 34, 4390 (1986)ADSCrossRefGoogle Scholar
  3. 3.
    S. Takahashi, M. Tachiki: Phys. Rev. B 33, 4620 (1986)ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • C. W. Hagen
    • 1
  • R. Griessen
    • 1
  • D. G. de Groot
    • 1
  • Ø. Fischer
    • 2
  • M. G. Karkut
    • 2
  1. 1.Vrije UniversiteitAmsterdamThe Netherlands
  2. 2.Université de GenèveGenèveSwitzerland

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