Magnesium-diboride ramp-type Josephson junctions

Mijatovic, Dragana; Brinkman, Alexander; Oomen, Ingrid; Rijnders, Guus; Hilgenkamp, Hans; Rogalla, Horst; Blank, Dave H. A.
March 2002
Applied Physics Letters;3/25/2002, Vol. 80 Issue 12, p2141
Academic Journal
Josephson junctions have been realized in which two superconducting magnesium-diboride (MgB[sub 2]) layers are separated by a thin MgO barrier layer, using the ramp-type configuration. Their currentvoltage characteristics follow the behavior described by the resistively shunted junction model, with an excess current of about 30% of the critical current I[sub c]. A suppression of 70% of I[sub c] was achieved in applied magnetic fields. Shapiro steps were observed by irradiating the junctions with 10.0 GHz microwaves, and the dependence of the step height on applied rf current is well described by a current-source model. Reference samples prepared without the MgO layer showed strong-link behavior with large I[sub c] values.


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