Properties of MgB2 films deposited on single crystal Ag layers

Abstract

We have recently developed a method to deposit MgB2 thin films on single crystal Ag layers, and found that thin Ag layers reduced the the superconductivity of MgB2 not much, which may be a possible material to fabricate MgB2 SNS Josephson junctions. The single crystal Ag layers were deposited on (0001) SiC substrates, and then the MgB2 thin films were deposited on the Ag layers. All the measurements included the XRD, M–T and M–H curves. The transition temperature of MgB2 films decreases from 39K to 37K, while the thickness of Ag layers grows from 0 to 20nm, and the critical current density at 4.2K decreases from 1.76MA/cm2 to 1.24MA/cm2, too.