Superconducting properties of nanocrystalline MgB${}_2$ thin films made by an in situ annealing process

Abstract

We have studied the structural and superconducting properties of MgB${}_2$ thin films made by pulsed laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB${}_2$ with very small grain sizes. A zero-resistance transition temperature ($T_{c0}$) of 34 K and a zero-field critical current density ($J_c$) of $1.3\times 10^6$ A/cm${}^2$ were obtained. The irreversibility field was $\sim$ 8 T at low temperatures, although severe pinning instability was observed. These bulk-like superconducting properties show that the in situ deposition process can be a viable candidate for MgB${}_2$ Josephson junction technologies.

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• Superconducting properties of MgB2 thin films prepared on flexible plastic substrates
• High quality MgB2 thin films in-situ grown by dc magnetron sputtering
• Tunnel junctions on as-grown superconducting MgB2 thin films
• Probe to properties of MgB2 thick film on silicon carbide substrate
• The superconducting gap of \QTR{em}{in situ} $Mg{B}_2$ thin films by microwave surface impedance measurements
• Preparation and properties of amorphous MgB${}_2$/MgO superstructures: A new model disordered superconductor
• Electrical and structural properties of MgB2 films prepared by sequential deposition of B and Mg on the NbN buffered Si(100) substrate