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2 Jan 2012

Volume 100, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 100, 013101 (2012); http://dx.doi.org/10.1063/1.3673334 (3 pages)

Patrice Genevet, Nanfang Yu, Francesco Aieta, Jiao Lin, Mikhail A. Kats, Romain Blanchard, Marlan O. Scully, Zeno Gaburro, and Federico Capasso
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Reducing vortex losses in superconducting microwave resonators with microsphere patterned antidot arrays

D. Bothner, C. Clauss, E. Koroknay, M. Kemmler, T. Gaber, M. Jetter, M. Scheffler, P. Michler, M. Dressel, D. Koelle, and R. Kleiner

Appl. Phys. Lett. 100, 012601 (2012); http://dx.doi.org/10.1063/1.3673869 (3 pages) | Cited 5 times

Online Publication Date: 4 January 2012

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We experimentally investigate the vortex induced energy losses in niobium coplanar waveguide resonators with and without quasihexagonal arrays of nanoholes (antidots), where large-area antidot patterns have been fabricated using self-assembling microsphere lithography. We perform transmission spectroscopy experiments around 6.25 GHz in magnetic field cooling and zero field cooling procedures with perpendicular magnetic fields up to B = 27 mT at a temperature T = 4.2 K. We find that the introduction of antidot arrays into resonators reduces vortex induced losses by more than one order of magnitude.
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85.25.Am Superconducting device characterization, design, and modeling
84.40.Az Waveguides, transmission lines, striplines

Structural and transport characterization of ultra thin Ba0.05Sr0.95TiO3 layers grown over Nb electrodes for the development of Josephson junctions

M. Sirena, L. Avilés Félix, G. A. Carvacho Vera, H. L. Navarro Fernández, L. B. Steren, R. Bernard, J. Briático, N. Bergeal, J. Lesueur, and G. Faini

Appl. Phys. Lett. 100, 012602 (2012); http://dx.doi.org/10.1063/1.3675332 (4 pages) | Cited 1 time

Online Publication Date: 5 January 2012

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A phenomenological approach was used to obtain critical information about the structure and electrical properties of ultra thin Ba0.05Sr0.95TiO3 (BSTO) layers over Nb electrodes. The method allows, in a simple way, to study and to optimize the growth of the barrier in order to improve the performance and application of Josephson junctions. A very good control of the layer thickness with a low roughness was achieved during the deposition process. The BSTO layers present an energy barrier of 0.6 eV and an attenuation length of 0.4 nm, indicating its good insulating properties for the development of Josephson junctions with improved performance.
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74.50.+r Tunneling phenomena; Josephson effects
73.40.Gk Tunneling
74.81.Fa Josephson junction arrays and wire networks
85.25.Cp Josephson devices
85.75.Mm Spin polarized resonant tunnel junctions
74.78.Fk Multilayers, superlattices, heterostructures
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