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23 Feb 1998

Volume 72, Issue 8, pp. 873-995

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Hot electron tunable supercurrent

A. F. Morpurgo, T. M. Klapwijk, and B. J. van Wees

Appl. Phys. Lett. 72, 966 (1998); http://dx.doi.org/10.1063/1.120612 (3 pages) | Cited 64 times

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A Josephson junction has been realized in which the supercurrent flow is regulated by a “normal” control current traversing the normal metal in between the superconducting electrodes. The principle of operation of the devices is based on the existing relation between the magnitude of the supercurrent and the electronic distribution function in the junction. This method for controlling the supercurrent has clear advantages over other known methods and is relevant for superconducting electronics applications. © 1998 American Institute of Physics.
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85.25.Cp Josephson devices
74.50.+r Tunneling phenomena; Josephson effects

Radio frequency SQUIDs operating at 77 K with 1 GHz lumped-element tank circuits

D. F. He, X. H. Zeng, H.-J. Krause, H. Soltner, F. Rüders, and Y. Zhang

Appl. Phys. Lett. 72, 969 (1998); http://dx.doi.org/10.1063/1.120611 (3 pages) | Cited 17 times

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We have developed a matching scheme for the operation of a rf superconducting quantum interference device (SQUID) with a lumped-element tank circuit at pumping frequencies up to 1 GHz. This conventional LC resonant circuit is inductively coupled to a matching coil, which is connected to the 50 Ω transmission line. We characterized the flux noise of high-temperature rf SQUIDs at resonant frequencies between 221 and 950 MHz. At about 900 MHz, we obtained the white flux noise of about 14.6 μϕ0/math with a SQUID inductance LS = 150 pH and 20 μϕ0/math with LS = 260 pH. Several of such tank circuits can be driven in parallel or in series with only one cable. © 1998 American Institute of Physics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
84.30.-r Electronic circuits

Orientation control of ex situ (Hg1−xRex)Ba2CaCu2Oy (x ≈ 0.1) thin films on LaAlO3

C. Gasser, Y. Moriwaki, T. Sugano, K. Nakanishi, X.-J. Wu, S. Adachi, and K. Tanabe

Appl. Phys. Lett. 72, 972 (1998); http://dx.doi.org/10.1063/1.120613 (3 pages) | Cited 12 times

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(Hg1−xRex)Ba2CaCu2Oy (x ≈ 0.1) thin films have been prepared ex situ on LaAlO3 substrates by a two-step process in which an HgO/Re0.1Ba2CaCu2Oy multilayer precursor film is annealed in a quartz tube using an unreacted monoxide pellet containing HgO as an Hg vapor source. By varying the composition of the monoxide pellet, the film orientation can be changed from c-axis to the predominantly a-axis one. The a-axis growth of the grains directly on the substrate is confirmed by x-ray diffraction and transmission electron microscopic observation, although the grains are twinned with 90° orientation. The a-axis films exhibit a Tc onset and Tc zero of approximately 110–127 and 55 K, respectively, suggesting substantial influence of weak links at the grain boundaries on their transport properties. © 1998 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.10.+v Occurrence, potential candidates
74.25.Sv Critical currents
81.15.Fg Pulsed laser ablation deposition
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