Superconducting Properties of Iridium
Iridium has been reported as a superconductor with transition temperatures1–3 ranging from 0.105 to 0.140°K. Due to the low transition temperature and the difficulty in obtaining sufficiently pure bulk samples, other superconductive properties of iridium have not been examined in any great detail. We describe experiments in which the residual resistivity ratio, magnetization curves, critical magnetic field data, and superconductive transition temperature measurements have been correlated in an attempt to understand the properties of this superconductor. In addition, we have examined the effects of sample preparation on the width and position of the superconducting transition in zero magnetic field with the view of establishing iridium as a superconductive thermometric fixed point.
KeywordsMagnetization Curve Critical Magnetic Field Zero Magnetic Field Residual Resistivity Ratio Cerium Magnesium Nitrate
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