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Penetration depth of MgB2 measured using Josephson junctions and SQUIDs
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10.1063/1.4793194
/content/aip/journal/apl/102/7/10.1063/1.4793194
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/7/10.1063/1.4793194

Figures

Image of FIG. 1.
FIG. 1.

The critical current of a MgB/native oxide/Nb junction modulated by applied magnetic field (solid line) fitted by a theoretical fit with  = 37 nm (dotted line). Inset shows a schematic of the junction in an external magnetic field .

Image of FIG. 2.
FIG. 2.

(a) Schematic and (b) optical image of DC SQUID.

Image of FIG. 3.
FIG. 3.

Voltage across a DC SQUID modulated by microstrip current at 3.2 K. The SQUID is biased at various current from 0.4 mA to 2 mA.

Image of FIG. 4.
FIG. 4.

Temperature dependence of normalized inverse-squared penetration depth from the SQUIDs measurement compared with the theory proposed by Golubov 5 for the clean (dashed line) and dirty (dashed double dotted line) limits in the -axis and dirty limit (dashed-dotted line) in the -axis. Also plotted is the result of a mutual inductance measurement (solid line) on a 20 nm-thick MgB film.

Tables

Generic image for table
Table I.

Penetration depth of MgB calculated from 12 square-shaped junctions of different length and top electrode materials.

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/content/aip/journal/apl/102/7/10.1063/1.4793194
2013-02-21
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Penetration depth of MgB2 measured using Josephson junctions and SQUIDs
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/7/10.1063/1.4793194
10.1063/1.4793194
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