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1 Jun 1998

Volume 72, Issue 22, pp. 2779-2913

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Radio-frequency amplifier based on a niobium dc superconducting quantum interference device with microstrip input coupling

Michael Mück, Marc-Olivier André, John Clarke, Jost Gail, and Christoph Heiden

Appl. Phys. Lett. 72, 2885 (1998); http://dx.doi.org/10.1063/1.121490 (3 pages) | Cited 38 times

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A dc superconducting quantum interference device (SQUID) was used to amplify radio-frequency signals that were coupled to one end of the microstrip formed by the input coil and the SQUID washer. For one device, the resonant frequency of the microstrip was increased from about 200 to 620 MHz by progressively shortening the length of the coil. At an operating temperature of 4.2 K, the gain was typically 18 dB, and the system noise temperature ranged from 0.5±0.3 K at 80 MHz to 3.0±0.7 K at 500 MHz. © 1998 American Institute of Physics.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
84.40.Az Waveguides, transmission lines, striplines
84.30.Le Amplifiers

Superconducting Nd1.85Ce0.15CuO4−y bicrystal grain boundary Josephson junctions

S. Kleefisch, L. Alff, U. Schoop, A. Marx, R. Gross, M. Naito, and H. Sato

Appl. Phys. Lett. 72, 2888 (1998); http://dx.doi.org/10.1063/1.121449 (3 pages) | Cited 12 times

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We have studied the electric transport properties of symmetrical [001] tilt Nd1.85Ce0.15CuO4−y (NCCO) bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO3 bicrystal substrates with misorientation angles of 24° and 36.8°. The superconducting properties of the NCCO GBJs are similar to those of GBJs fabricated from the hole doped high temperature superconductors (HTS). The critical current density Jc decreases strongly with increasing misorientation angle. The products of the critical current Ic and the normal resistance Rn ( ∼ 100 μV at 4.2 K) are small compared to the gap voltage and fit well to the universal scaling law IcRn∝math found for GBJs fabricated from the hole doped HTS. This suggests that the symmetry of the order parameter, which most likely is different for the electron and the hole doped HTS, has little influence on the characteristic properties of symmetrical [001] tilt GBJs. © 1998 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
61.72.Mm Grain and twin boundaries

Measurement of the magnetic induction vector in superconductors using a double-layer Hall sensor array

Y. Abulafia, M. McElfresh, A. Shaulov, Y. Yeshurun, Y. Paltiel, D. Majer, H. Shtrikman, and E. Zeldov

Appl. Phys. Lett. 72, 2891 (1998); http://dx.doi.org/10.1063/1.121450 (3 pages) | Cited 3 times

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We describe an experimental technique for simultaneous measurement of both the normal (Bz) and the in-plane (Bx) components of the magnetic induction field near the surface of a superconducting sample. This technique utilizes a novel design of a double-layered Hall sensor array fabricated from a GaAs/AlGaAs heterostructure containing two parallel layers of a two-dimensional electron gas. The effectiveness of this technique is demonstrated in measurements of Bx and Bz and the current distribution at the surface of a thin YBa2Cu3O7 crystal. © 1998 American Institute of Physics.
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07.55.-w Magnetic instruments and components
85.30.Fg Bulk semiconductor and conductivity oscillation devices (including Hall effect devices, space-charge-limited devices, and Gunn effect devices)
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
41.20.Gz Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
74.72.-h Cuprate superconductors
74.25.Ha Magnetic properties including vortex structures and related phenomena
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