Abstract
The high-magnetic-field properties of some refractory carbides were investigated at low temperatures. The upper critical fields for NbC, a solid solution of 40% NbC-60% TaC, and TaC are between 4.2 and 21.3 kG; MoC, , and +2% VC have upper critical fields between 80 and 120 kG; and C has an upper critical field of 156 kG at 1.2°K. C is the only known superconductor with the crystal structure. From the available data the electronic specific-heat coefficient , the thermodynamic critical field , the Ginzburg-Landau parameter , and the lower critical field were estimated at the experimental temperatures.
- Received 21 December 1964
DOI:https://doi.org/10.1103/PhysRev.138.A1170
©1965 American Physical Society