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All magnesium diboride Josephson junctions with MgO and native oxide barriers
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10.1063/1.3332575
/content/aip/journal/apl/96/8/10.1063/1.3332575
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/8/10.1063/1.3332575
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Variation of superconducting transition temperature with film thickness. (b) Typical I-V characteristic of an junction at 4.2 K with 2.4 nm MgO, showing dc Josephson effect. The hysteresis suggests underdumped junctions with Stewart–McCumber parameter equal to 12. (c) product vs junction area. Poor dependence on junction area indicates that the junctions were leak-current free.

Image of FIG. 2.
FIG. 2.

(a) The dependence of temperature, the filed circles are experimental data and the solid line is fit with expression , assuming two gaps superconductor. (b) I-V characteristics under irradiation of 9.3 GHz at 4.2 K measured for different rf power. The junction size was . For clarity the plots were shifted along the horizontal. The Shapiro steps appeared at the expected voltage values of times with .

Image of FIG. 3.
FIG. 3.

(a) Normalized conductance vs voltage at selected temperatures for an junction. The junction size was . The subgap characteristics suggest leakage barrier. (b) The superconducting energy gap is well fitted using expression for , , and .

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/content/aip/journal/apl/96/8/10.1063/1.3332575
2010-02-25
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: All magnesium diboride Josephson junctions with MgO and native oxide barriers
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/8/10.1063/1.3332575
10.1063/1.3332575
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