Abstract
The effect of hydrostatic pressure up to 17 kbar on the superconducting transition temperature of the newly discovered intermetallic nonoxide perovskite superconductor has been reported. is found to increase with increasing at a rate of to 0.0155 K/kbar depending on the value of carbon content The absolute value of for is about the same as that of intermetallic denotes rare earth) and metallic superconductors but about one order of magnitude smaller than that of the most recently and intensively studied superconductor However, the to and the rate of change of with unit cell volume (V), to of are having the comparable magnitude to that of with opposite sign. The increase of with in can be explained in the framework of density of states (DOS) effect.
- Received 22 April 2003
DOI:https://doi.org/10.1103/PhysRevB.68.092507
©2003 American Physical Society