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21 Mar 1988

Volume 52, Issue 12, pp. 939-1025

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Rugged low‐resistance contacts to YBa2Cu3Ox

R. Caton, R. Selim, A. M. Buoncristiani, and C. E. Byvik

Appl. Phys. Lett. 52, 1014 (1988); http://dx.doi.org/10.1063/1.99230 (3 pages) | Cited 21 times

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We have made rugged low‐resistance contacts to the high Tc superconductor YBa2Cu3Ox by melting gold beads onto the surface of the material. After retreating the samples in oxygen, we have measured contact resistance <50 μΩ. This allowed a direct current of ≊5 A to pass through the contacts without heating while the sample remained in the superconducting state at 20 K. In this letter we present results of scanning electron microscopy, and measurements of contact resistance, critical current, and shear strength on these contacts. Such contacts will be of practical use in high current carrying applications of the new high Tc superconductors.
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73.40.Cg Contact resistance, contact potential
73.40.Ns Metal-nonmetal contacts
74.70.-b Superconducting materials other than cuprates
85.25.Qc Superconducting surface acoustic wave devices and other superconducting devices

Vanishing contact resistance on polycrystalline YBa2Cu3O7−x

A. D. Wieck

Appl. Phys. Lett. 52, 1017 (1988); http://dx.doi.org/10.1063/1.99231 (3 pages) | Cited 24 times

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The preparation and characterization of gold contacts on polycrystalline YBa2Cu3O7−x ceramics that carry high currents and exhibit contact resistances of only 50 mΩ at room temperature are reported. By cooling the sample this resistance remains essentially constant until the superconducting transition temperature, Tc≂89 K, is reached. At Tc the contact resistance decreases like the resistivity of YBa2Cu3O7−x, reaching at T<Tc about 10 μΩ. This value is comparable to the intrinsic resistance of the contact material. Thus, below Tc, the contacts exhibit vanishing contact resistance at the metal–high‐Tc‐superconductor interface. Such low contact resistances may be extremely important for the technical application of the novel superconductors.
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74.70.-b Superconducting materials other than cuprates
73.40.Cg Contact resistance, contact potential
73.40.Ns Metal-nonmetal contacts

Atom probe analysis of a ceramic oxide superconductor

A. Cerezo, C. R. M. Grovenor, R. M. Hoyle, and G. D. W. Smith

Appl. Phys. Lett. 52, 1020 (1988); http://dx.doi.org/10.1063/1.99232 (3 pages) | Cited 10 times

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Field‐ion specimens have been produced from a bulk ceramic yttrium barium cuprate superconductor, allowing quantitative atom probe analysis from this new class of materials. This technique offers the potential for high‐resolution quantitative analysis for oxygen concentrations in the near‐surface regions and the study of microchemistry of contact/superconductor interfaces. Preliminary results are presented on bulk compositions and the surface modifications following vacuum annealing.
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74.70.-b Superconducting materials other than cuprates
07.78.+s Electron, positron, and ion microscopes; electron diffractometers
68.35.Dv Composition, segregation; defects and impurities
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

Proximity gettering with mega‐electron‐volt carbon and oxygen implantations

H. Wong, N. W Cheung, P. K. Chu, J. Liu, and J. W. Mayer

Appl. Phys. Lett. 52, 1023 (1988); http://dx.doi.org/10.1063/1.99233 (3 pages) | Cited 87 times

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We have demonstrated that a buried gettering layer can be formed with a single MeV ion implantation without damaging the top device region. The strong gettering efficiency of carbon implant and its linear dependence on dose are confirmed. A surprising feature of the carbon implanted layers is that no extended defects are formed after annealing for implant doses up to 2×1016 cm−2 at 3 MeV, compared to a layer of small precipitates and dislocations in the case of oxygen implantation. It is suggested that the carbon‐related gettering centers are point defects or their clusters.
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61.72.uf Ge and Si
61.72.Bb Theories and models of crystal defects
66.30.J- Diffusion of impurities
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