The Effect of Annealing and Gas Content on the Superconducting Properties of Tantalum
- 15 December 1947
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 72 (12) , 1241-1245
- https://doi.org/10.1103/physrev.72.1241
Abstract
The superconducting transition temperatures and critical fields of three wires of 99.9+percent pure tantalum, taken from the same spool, have been investigated to find the effect of annealing and gas content. Annealing the metal at very high temperatures raised the transition temperature from 4.156 to 4.32°K and lowered the initial slope of the critical magnetic field from 1360 to 600 gausses per degree. Much sharper transitions were observed for the annealed specimens. The effect of absorbed gas was slight. Spontaneous fluctuations of resistance on the transition into superconductivity were observed. The effect of the specimen current on the critical field was studied in one of the annealed specimens.Keywords
This publication has 11 references indexed in Scilit:
- Controlled Crystal Growth in Tantalum RibbonsJournal of Applied Physics, 1943
- Studies in Superconductivity III. Sn, Cb, Ta, and Pb WiresPhysical Review B, 1942
- The specific heats of tantalum in the normal and in the superconductive statePhysica, 1941
- The “overshoot phenomenon” in superconductivityMathematical Proceedings of the Cambridge Philosophical Society, 1938
- New measurements of liquid helium temperaturesPhysica, 1937
- Equilibrium curve and entropy difference between the supraconductive and the normal state in Pb, Hg, Sn, Ta, and NbProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1937
- XLIV.Experiments on supraconductive tantalumJournal of Computers in Education, 1936
- REACTION OF GASES WITH INCANDESCENT TANTALUMJournal of the American Chemical Society, 1932
- Messungen mit Hilfe von flüssigem Helium. VIIThe European Physical Journal A, 1930
- Note on electrical conduction in metals at low temperaturesBulletin of the Bureau of Standards, 1918