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19 Mar 2012

Volume 100, Issue 12, Articles (12xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 121101 (2012); http://dx.doi.org/10.1063/1.3693413 (4 pages)

Jolly Xavier, Raktim Dasgupta, Sunita Ahlawat, Joby Joseph, and Pradeep Kumar Gupta
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Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions

Ke Chen, Daniel Cunnane, Yi Shen, X. X. Xi, Alan W. Kleinsasser, and John M. Rowell

Appl. Phys. Lett. 100, 122601 (2012); http://dx.doi.org/10.1063/1.3695159 (4 pages)

Online Publication Date: 19 March 2012

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The current-voltage and conductance-voltage characteristics of MgB2/MgO/MgB2 junctions made with MgB2 electrodes grown by hybrid physical-chemical vapor deposition were systematically analyzed. In the junctions with different sizes and critical current densities, we found excess current and subharmonic gap structure indicative of multiple Andreev reflection. An apparent link between multiple Andreev reflection and substantial Josephson current at high temperatures suggests that the barrier is dominated by high-transparency channels.
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74.50.+r Tunneling phenomena; Josephson effects
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
74.25.F- Transport properties
74.25.Sv Critical currents

The influence of the buffer layer architecture on transport properties for BaFe1.8Co0.2As2 films on technical substrates

S. Trommler, R. Hühne, J. Hänisch, E. Reich, K. Iida, S. Haindl, V. Matias, L. Schultz, and B. Holzapfel

Appl. Phys. Lett. 100, 122602 (2012); http://dx.doi.org/10.1063/1.3696888 (4 pages) | Cited 3 times

Online Publication Date: 21 March 2012

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A low and almost temperature independent resistance in the normal state and an anomalous peak effect within the normal-superconducting transition have been observed in BaFe1.8Co0.2As2/Fe bilayers, prepared on ion beam assisted deposition-MgO/Y2O3 buffered technical substrates. A resistor network array sufficiently reproduces this effect, assuming an increase of the electrical conductance between tape and film with decreasing buffer layer thickness. Based on this model, we evaluated the influence of this effect on the critical current density and successfully reconstructed the superconducting transition of the bilayer.
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74.25.fc Electric and thermal conductivity
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.78.Fk Multilayers, superlattices, heterostructures
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