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.
@article{arxiv.1010.4289,
title = {Differential Conductance Measurements of MgB2-Based Josephson Junctions Below 1 Kelvin},
author = {Steve Carabello and Joseph Lambert and Jerome Mlack and Roberto Ramos},
journal= {arXiv preprint arXiv:1010.4289},
year = {2015}
}