Abstract
The superconducting transition temperature of pure Ir is found to be 0.1125 K (±0.0005 K). The critical magnetic field as a function of temperatureHc(T) has also been measured. From these data it is determined thatHc(0) is 16.00 G (1 G corresponds to 10−4 T), (dHc/dT)T=Tc is 235 G/K, the linear coefficient of normal state electronic specific heat γ is 3.19 mJ/mole-K2, and the energy gap anisotropy parameter 〈a2〉 is 0.048. This value for 〈a2〉 is the largest of any superconducting element so far observed, and its significance in determining the superconducting properties of Ir is discussed. By using the large supercooling effects noticed nearTc, the Ginzburg-Landau parameter x0 is found to be 8.6×10−3. The effects of impurities onTc and on the magnetic behavior of Ir are also discussed.
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