Abstract
The design and testing of a new device for point contact tunnelling measurements in superconductors are described. The insert is designed for use with a continuous flow cryostat which allows for a large range of sample temperatures from 1.5 K to room temperature. The use of nonmagnetic parts allows tunnelling measurements to be performed in high magnetic fields. Testing was carried out on a conventional superconductor, Nb, in fields up to 6 T using Nb and Au tips to obtain superconductor–insulator–superconductor and superconductor–insulator–normal metal junctions. In addition, a moderate- T c oxide superconductor, Ba 1−xK xBiO 3, was used to obtain temperature and magnetic field dependencies of the energy gap.
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