A versatile cryostat and a mutual inductance coil for a.c. susceptibility measurements on high Tc superconductors

Abstract

An inexpensive cryostat and a mutual inductance coil are described for a.c. susceptibility measurements on high temperature superconductors. A unique feature of the cryostat is that it can be operated from 77 K upwards, whereas conventional gas-flow-type cryostats reach a lowest temperature of about 90 K. Other advantages of the system are also presented.