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30 Apr 2012

Volume 100, Issue 18, Articles (18xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 181901 (2012); http://dx.doi.org/10.1063/1.4705414 (4 pages)

Etienne Brasselet, Arnaud Royon, and Lionel Canioni
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Complete tailor-made inverse filter for image processing of scanning SQUID microscope

Masahiko Hayashi, Hiromichi Ebisawa, Ho Thanh Huy, and Takekazu Ishida

Appl. Phys. Lett. 100, 182601 (2012); http://dx.doi.org/10.1063/1.4709492 (4 pages)

Online Publication Date: 1 May 2012

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By introducing a numerical image processing technique, the resolution of scanning SQUID microscope (SSM) has been improved beyond the “naive” limit determined by the size of the pickup (sensor) coil. Our image processing is developed by taking account of the specific characteristics of SSM apparatus, including detailed shape of the coil and its perfect diamagnetism, in a tailor-made manner. The actual experiment has been done for nano-scale superconducting Pb network, and the magnetic field structures apparently smaller than the size of the pickup coil were made visible by our method.
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42.30.Va Image forming and processing
85.25.Dq Superconducting quantum interference devices (SQUIDs)
07.79.-v Scanning probe microscopes and components

Critical-current reduction in thin superconducting wires due to current crowding

H. L. Hortensius, E. F. C. Driessen, T. M. Klapwijk, K. K. Berggren, and J. R. Clem

Appl. Phys. Lett. 100, 182602 (2012); http://dx.doi.org/10.1063/1.4711217 (4 pages) | Cited 8 times

Online Publication Date: 3 May 2012

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We demonstrate experimentally that the critical current in superconducting NbTiN wires is dependent on their geometrical shape, due to current-crowding effects. Geometric patterns such as 90∘ corners and sudden expansions of wire width are shown to result in the reduction of critical currents. The results are relevant for single-photon detectors as well as parametric amplifiers.
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74.25.Sv Critical currents
74.70.Dd Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
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