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4 Apr 1988

Volume 52, Issue 14, pp. 1111-1195

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Signal and white noise properties of edge junction dc SQUID’s

R. T. Wakai and D. J. Van Harlingen

Appl. Phys. Lett. 52, 1182 (1988); http://dx.doi.org/10.1063/1.99197 (3 pages) | Cited 4 times

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We have fabricated and characterized the noise performance of submicron edge junction dc superconducting quantum interference devices (SQUID’s) which exhibit excellent signal properties and extremely high flux sensitivity. At frequencies above about 3 MHz, the SQUID noise is white and is in reasonable agreement with computer simulations for a thermal noise‐limited detector. In one device the measured flux energy resolution is 1.6±0.5ℏ at 1.5 K, within a factor of 2 of the quantum‐limited value suggested by theoretical modeling.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.50.+r Tunneling phenomena; Josephson effects
74.40.-n Fluctuation phenomena

Thin films of Y‐Ba‐Cu‐O on silicon and silicon dioxide

A. Mogro‐Campero and L. G. Turner

Appl. Phys. Lett. 52, 1185 (1988); http://dx.doi.org/10.1063/1.99670 (2 pages) | Cited 46 times

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Thin films of the high‐temperature superconductor Y‐Ba‐Cu‐O near the 1:2:3 stoichiometry were deposited on single‐crystal silicon and oxidized silicon with a zirconia buffer layer. Zero‐resistance transition temperatures up to 83 K have been measured on the films formed by a process of sequential evaporation and furnace annealing.
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74.78.-w Superconducting films and low-dimensional structures
74.70.-b Superconducting materials other than cuprates
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy

Sputter deposition of YBa2Cu3O7−x films using a hemispherical target in a Hg vapor triode plasma

G. K. Wehner, Y. H. Kim, D. H. Kim, and A. M. Goldman

Appl. Phys. Lett. 52, 1187 (1988); http://dx.doi.org/10.1063/1.99671 (3 pages) | Cited 7 times

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High‐quality stoichiometric films of YBa2 Cu3 O7−x have been grown epitaxially on SrTiO3 substrates by sputtering from a stoichiometric target of hemispherical shape using a Hg vapor triode plasma. Films exhibited superconducting transitions of a width ΔT∼2.5 K, with zero resistance being achieved at 89 K. From both the x rays and the temperature dependence of the normal‐state electrical resistance it can be inferred that the films contain an admixture of domains with either the c or a axes normal to the plane.
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74.78.-w Superconducting films and low-dimensional structures
68.55.-a Thin film structure and morphology
81.15.Cd Deposition by sputtering
74.70.-b Superconducting materials other than cuprates

Determination of crystallographic orientation of YBa2Cu3Ox grains from their optical twin patterns

J. D. Verhoeven and E. D. Gibson

Appl. Phys. Lett. 52, 1190 (1988); http://dx.doi.org/10.1063/1.99672 (3 pages) | Cited 12 times

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Polycrystalline arrays of YBa2Cu3Ox grains display optical twin patterns and flat sides. The long sides of elongated grains are basal planes, {001}, and the twin planes are {110} planes. A technique is presented here for evaluating the crystallographic orientation of an elongated grain from the angles formed on the polish surface by its (110) and (110) twin traces with the long grain boundary. Comparison with selected area channeling patterns from individual grains confirms the validity of the technique. The technique may be of some use in evaluating the texture of polycrystalline samples.
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61.72.Mm Grain and twin boundaries
74.70.-b Superconducting materials other than cuprates

Observation of two distinct components during pulsed laser deposition of high Tc superconducting films

T. Venkatesan, X. D. Wu, A. Inam, and J. B. Wachtman

Appl. Phys. Lett. 52, 1193 (1988); http://dx.doi.org/10.1063/1.99673 (3 pages) | Cited 178 times

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Using Rutherford backscattering technique, we have measured the angular distribution of the composition and thickness of the Y‐Ba‐Cu oxide film deposited by firing excimer laser (30 ns, 248 nm) pulses at a stoichiometric Y1Ba2Cu3O7−x pellet. The angular distribution consisted of two distinct components: one a cos θ component, a result of evaporation, and the other a highly forward directed component, a result of a secondary ejection process. The evaporated component is nonstoichiometric, as one would expect, whereas the forward‐directed component has a composition close to that of the pellet. Further, the forward‐directed stoichiometric component increases with the laser energy density in comparison with the evaporated component. These observations are discussed in the context of current models of laser‐induced material ejection at surfaces.The laser energy dependence of the deposition is of critical importance in controlling the film stoichiometry.
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74.78.-w Superconducting films and low-dimensional structures
74.70.-b Superconducting materials other than cuprates
68.55.Nq Composition and phase identification
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
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