The Effect of Ru substitution for Ni on the superconductivity in MgCNi3-xRux
T. Klimczuk, V. Gupta, G. Lawes, A.P. Ramirez, R.J. Cava
TL;DR
This study investigates how substituting Ru for Ni in MgCNi3 affects its superconducting properties, revealing a decrease in critical temperature and electronic density of states without inducing ferromagnetism.
Contribution
It provides new insights into the effects of Ru doping on MgCNi3's superconductivity and magnetic behavior, expanding understanding of chemical substitution impacts.
Findings
Superconducting transition temperature decreases with Ru substitution.
The electronic density of states, indicated by gamma_exp, decreases upon doping.
No ferromagnetism develops with Ru substitution.
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.
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