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12 Oct 1998

Volume 73, Issue 15, pp. 2069-2222

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High Tc superconducting second-order gradiometer

A. Kittel, K. A. Kouznetsov, R. McDermott, B. Oh, and John Clarke

Appl. Phys. Lett. 73, 2197 (1998); http://dx.doi.org/10.1063/1.122421 (3 pages) | Cited 17 times

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A planar, second-order gradiometer was fabricated from single-layer YBa2Cu3O7−x films. The gradiometer consists of a symmetric flux transformer with an overall length of 80 mm inductively coupled to a directly coupled magnetometer, and has a baseline of 31 mm. The mutual inductance between the flux transformer and the magnetometer is adjusted mechanically to reduce the response to a uniform magnetic field applied perpendicularly to the plane of the gradiometer to typically 50 ppm. From an independent measurement, the residual first-order gradient response was determined to be at most 1.4% relative to the second-order gradient response. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements
85.25.Dq Superconducting quantum interference devices (SQUIDs)

Microwave power handling in engineered YBa2Cu3O7−δ grain boundaries

Y. M. Habib, D. E. Oates, G. Dresselhaus, M. S. Dresselhaus, L. R. Vale, and R. H. Ono

Appl. Phys. Lett. 73, 2200 (1998); http://dx.doi.org/10.1063/1.122422 (3 pages) | Cited 11 times

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Microwave-frequency (rf) power-dependence measurements performed on thin-film YBa2Cu3O7−δ grain boundaries engineered on sapphire bicrystal substrates with misorientation angles of θ = 2°, 5°, 10°, and 24° are presented. The data are compared to measurements on films grown on single-crystal substrates. A stripline-resonator measurement technique is employed. The rf results are compared to dc measurements performed on a four-point test structure on the same substrate as the resonator. The measurements demonstrate that low-angle grain boundaries (θ ⩽ 10°) have little effect on the rf power handling, while the high-angle grain boundaries (θ = 24°) cause large nonlinear losses due to Josephson vortices created by rf currents. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
61.72.Mm Grain and twin boundaries
74.78.-w Superconducting films and low-dimensional structures
74.50.+r Tunneling phenomena; Josephson effects
74.25.F- Transport properties
74.25.N- Response to electromagnetic fields
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