Thermodynamic properties of superconducting iridium
Journal Article
·
· Journal of Low Temperature Physics
The superconducting transition temperature of pure Ir is found to be 0.1125 K ( plus or minus 0.0005 K). The critical magnetic field as a function of temperature H/sub c/(T) has also been measured. From these data it is determined that H/sub c/(0) is 16.00 G (1 G corresponds to 10/sup -4/T), (dH/sub c//dT)/sub T = T/sub c/ is 235 G/K, the linear coefficient of normal state electronic specific heat gamma is 3.19 mJ/mole-K/sup 2/, and the energy gap anisotropy parameter (a/sup 2/) is 0.048. This value for (a/sup 2/) 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 near T, the Ginzburg--Landau parameter kappa / sub 0/ is found to be 8.6 x 10/sup -3/. The effects of impurities on T/sub c/and on the magnetic behavior of Ir are also discussed.
- Research Organization:
- Naval Research Lab., Washington, DC
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-014063
- OSTI ID:
- 4362235
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 13; ISSN 0022-2291
- Publisher:
- Plenum Press
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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