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Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions
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10.1063/1.3695159
/content/aip/journal/apl/100/12/10.1063/1.3695159
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/12/10.1063/1.3695159
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) RnI-V curves of MgB2-MgO-MgB2 Josephson junctions with different Jc values. The BCS π-I-π tunneling curve is shown for comparison.

Image of FIG. 2.
FIG. 2.

(Color online) The RndI/dV-V curves at T = 4.2 K for four MgB2/MgO/MgB2 Josephson junctions with different J c and scattering parameter Z values. The solid curves are theoretical fits.

Image of FIG. 3.
FIG. 3.

(Color online) The RndI/dV-V curves at T = 4.2 K for 6 MgB2/MgO/MgB2 Josephson junctions with close Jc values but different sizes. Among the junctions, (a)-(c) are connected by Au and (d)-(f) are connected by MgB2. The solid curves are theoretical fits.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Voltages of conductance peaks for the junction with Jc  = 5.7 kA/cm2 (symbols) compared to 2Δπ/n (n = 1.00, 2.15, 3.22, and 5.00) following the BCS relation (lines). (b) Determination of excess current for various temperatures by extrapolating the I-V curve at large bias to the current axis (dashed lines). The origin of the horizontal axis is shifted for different curves for clarity. Inset: Temperature dependence of the barrier parameter Z derived from the excess current.

Image of FIG. 5.
FIG. 5.

(Color online) The RnI-V curves of a MgB2/MgO/MgB2 junction (4.2 K) in comparison with a MgB2 point-contact junction (8.9 K, Ref. 10), a MgB2/AlN/MgB2 junction (4.2 K, Ref. 4), a MgB2/AlO x /MgB2 junction (4.2 K, Ref. 5), and a MgB2/native oxide/Pb junction (4.2 K).

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/content/aip/journal/apl/100/12/10.1063/1.3695159
2012-03-19
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiple Andreev reflection in MgB2/MgO/MgB2 Josephson junctions
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/12/10.1063/1.3695159
10.1063/1.3695159
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