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29 Jun 1998

Volume 72, Issue 26, pp. 3399-3517

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Basal plane oxygen vapor pressure of Co-doped YBa2Cu3O7−δ

J. P. Sydow, R. A. Buhrman, and B. H. Moeckly

Appl. Phys. Lett. 72, 3512 (1998); http://dx.doi.org/10.1063/1.121644 (3 pages) | Cited 8 times

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Transport data for YBa2Cu3−xCoxOz thin films, with x = 0.3, 0.5, 0.75, and 1.0, are reported as a function of annealing history in O2 and O2/O3 at temperatures ranging from 200 to 500 °C. For x = 0.3 and 0.5, O2/O3 anneals resulted in maximal Tc’s significantly higher than any previously reported, while in all cases the annealing substantially increased the film’s conductivity. Subsequent anneals in O2 resulted in oxygen loss, demonstrating that these materials have a much higher oxygen vapor pressure in the well-oxygenated state than YBa2Cu3O7−δ. © 1998 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.10.+v Occurrence, potential candidates
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization

Effective area in slotted high Tc dc washer superconducting quantum interference devices

A. B. M. Jansman, M. Izquierdo, A. Eiguren, J. Flokstra, and H. Rogalla

Appl. Phys. Lett. 72, 3515 (1998); http://dx.doi.org/10.1063/1.121645 (3 pages) | Cited 5 times

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Slotted high Tc dc washer superconducting quantum interference devices (SQUIDs) exhibit increased effective areas with respect to their solid washer counterparts. To investigate this systematically, a series of SQUIDs with zero to eight slots is fabricated. A maximum gain in effective area of 24% was observed for four slots. A model, considering the slotted washer as a parallel circuit of pick-up inductances can account for the enhanced effective area. A good fit with the experiments is obtained if the London penetration depth at 0 K is taken to be 267 nm. Furthermore, the model provides the current distribution in the slotted SQUIDs. © 1998 American Institute of Physics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
74.25.Ha Magnetic properties including vortex structures and related phenomena
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