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20 Jul 1998

Volume 73, Issue 3, pp. 279-419

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Imaging of vortices in superconductors by electron beam scanning

J. Martin, R. P. Huebener, J. B. le Grand, C. A. Mears, S. E. Labov, and A. T. Barfknecht

Appl. Phys. Lett. 73, 378 (1998); http://dx.doi.org/10.1063/1.121840 (3 pages) | Cited 5 times

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Abrikosov vortices trapped in a superconducting tunnel junction and oriented perpendicular to the barrier plane were imaged by electron beam scanning at 1.6 K. We have used NbAlOxNb junctions. As an important feature, the top Nb electrode was covered with a SiO2 film of 300 nm thickness, absorbing most of the 5 keV beam energy. The signal generating the image is explained by a model, assuming that the beam-induced electronic excitations in the SiO2 overlay film are trapped in the local magnetic field protruding from a vortex, resulting in an increased recombination rate. In addition to providing a novel approach to the imaging of the vortices in superconductors, our results are important for understanding quasiparticle losses in tunnel junction detectors. © 1998 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Growth of HgBa2Ca2Cu3O8 thin films using stable Re0.1Ba2Ca2Cu3Ox precursor by pulsed laser deposition

W. N. Kang, R. L. Meng, and C. W. Chu

Appl. Phys. Lett. 73, 381 (1998); http://dx.doi.org/10.1063/1.121841 (3 pages) | Cited 21 times

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High quality c-axis oriented HgBa2Ca2Cu3O8 thin films have been fabricated with the stable Re-doped Ba2Ca2Cu3Ox precursor powder by pulsed laser deposition followed by postannealing without any special handling. As-grown films on (100) SrTiO3 exhibit a zero-resistance transition (Tc,zero) at ∼131 K with a narrow transition width ΔT ∼ 1.5 K after oxygen annealing at 340 °C for 12 h. The critical current densities are observed 1.1×107 A/cm2 at 10 K and 1.2×105 A/cm2 at 120 K in zero field. The x-ray diffraction pattern indicates highly c-axis oriented thin films normal to the substrate plane containing a minor HgBa2CaCu2O6 phase. The scanning electron microscopy analysis shows that the surface morphology of the film is well connected platelike crystals but reveals Ba–Cu–Ox impurities are uniformly scattered across the film surface. © 1998 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
81.15.Fg Pulsed laser ablation deposition
74.25.Sv Critical currents
74.62.-c Transition temperature variations, phase diagrams
68.35.B- Structure of clean surfaces (and surface reconstruction)
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