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Differential Conductance Measurements of {\rm MgB}_{2} -Based Josephson Junctions Below 1 Kelvin

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4 Author(s)
Carabello, S. ; Dept. of Phys., Drexel Univ., Philadelphia, PA, USA ; Lambert, J. ; Mlack, J. ; Ramos, R.

Magnesium diboride has many intriguing characteristics, including its relatively high critical temperature and two-band nature. Most prior studies of MgB2 thin film Josephson junctions have been conducted above 2 Kelvin. We report results of sub-1 Kelvin experiments of MgB2/insulator/Pb junctions whose a-b plane is exposed for electron tunneling. By measuring differential conductance at low temperature, new details in the structure of the sigma- and pi-band gaps are observed in this data, consistent with theoretical predictions.

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Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )