Diamagnetic response of cylindrical normal-metal superconductor proximity structures with low concentration of scattering centers

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1999
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Müller-Allinger, Bernd F.
Mota, Ana Celia
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Physical Review B. 1999, 59(13), pp. 8887-8895. Available under: doi: 10.1103/PhysRevB.59.8887
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We have investigated the diamagnetic response of composite NS proximity wires, consisting of a clean silver or copper coating, in good electrical contact to a superconducting niobium or tantalum core. The samples show strong induced diamagnetism in the normal layer, resulting in a nearly complete Meissner screening at low temperatures. The temperature dependence of the linear diamagnetic susceptibility data is successfully described by the quasiclassical Eilenberger theory including elastic scattering characterized by a mean-free path l. Using the mean-free path as the only fit parameter we found values of l in the range 0.1 1 of the normal metal-layer thickness dN, which are in rough agreement with the ones obtained from residual resistivity measurements. The fits are satisfactory over the whole temperature range between 5 mK and 7 K for values of dN varying between 1.6 and 30 μm. Although a finite mean-free path is necessary to correctly describe the temperature dependence of the linear-response diamagnetic susceptibility, the measured breakdown fields in the nonlinear regime follow the temperature and thickness dependence given by the clean limit theory. However, there is a discrepancy in the absolute values. We argue that in order to reach quantitative agreement one needs to take into account the mean-free path from the fits of the linear response.

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ISO 690MÜLLER-ALLINGER, Bernd F., Ana Celia MOTA, Wolfgang BELZIG, 1999. Diamagnetic response of cylindrical normal-metal superconductor proximity structures with low concentration of scattering centers. In: Physical Review B. 1999, 59(13), pp. 8887-8895. Available under: doi: 10.1103/PhysRevB.59.8887
BibTex
@article{MullerAllinger1999Diama-5214,
  year={1999},
  doi={10.1103/PhysRevB.59.8887},
  title={Diamagnetic response of cylindrical normal-metal superconductor proximity structures with low concentration of scattering centers},
  number={13},
  volume={59},
  journal={Physical Review B},
  pages={8887--8895},
  author={Müller-Allinger, Bernd F. and Mota, Ana Celia and Belzig, Wolfgang}
}
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    <dcterms:abstract xml:lang="eng">We have investigated the diamagnetic response of composite NS proximity wires, consisting of a clean silver or copper coating, in good electrical contact to a superconducting niobium or tantalum core. The samples show strong induced diamagnetism in the normal layer, resulting in a nearly complete Meissner screening at low temperatures. The temperature dependence of the linear diamagnetic susceptibility data is successfully described by the quasiclassical Eilenberger theory including elastic scattering characterized by a mean-free path l. Using the mean-free path as the only fit parameter we found values of l in the range 0.1 1 of the normal metal-layer thickness dN, which are in rough agreement with the ones obtained from residual resistivity measurements. The fits are satisfactory over the whole temperature range between 5 mK and 7 K for values of dN varying between 1.6 and 30 μm. Although a finite mean-free path is necessary to correctly describe the temperature dependence of the linear-response diamagnetic susceptibility, the measured breakdown fields in the nonlinear regime follow the temperature and thickness dependence given by the clean limit theory. However, there is a discrepancy in the absolute values. We argue that in order to reach quantitative agreement one needs to take into account the mean-free path from the fits of the linear response.</dcterms:abstract>
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