Superconductivity of Pb films studied with superconducting Pb tips Cai, FangLiang ; Li, PengJu ; Xie, Kun ; Tang, Rui ; Qin, ShengYong Abstract Publication: Science China Physics, Mechanics, and Astronomy Pub Date: January 2019 DOI: 10.1007/s11433-018-9269-3 Bibcode: 2019SCPMA..6217421C