The Effect of Ru substitution for Ni on the superconductivity in MgCNi3-xRux
arXiv:cond-mat/0406415 · doi:10.1103/PhysRevB.70.094511
Abstract
The superconductor MgCNi3 has been chemically doped by partial substitution of Ru for Ni in the solid solution MgCNi3-xRux for 0<x<0.5. Magnetic and specific heat measurements show that the Sommerfeld parameter (gamma_exp) and TC decrease immediately on Ru substitution, but that a TC above 2K is maintained even for a relatively large decrease in gamma_exp. Ferromagnetism is not observed to develop through Ru substitution, and the normal state magnetic susceptibility is suppressed.
18 pages, 13 figures