The suppression of superconductivity in Mn substituted MgCNi${}_3$

Abstract

We report the effect of doping Mn in the isostructural MgCNi${}_{3-x}$Mn${}_x$ (x = 0-0.05) compounds. Magnetic susceptibility, resistivity, magneto-resistance, and specific heat studies show evidence of localized moments and Kondo effect in samples with x$\ne$0. The rapid suppression of superconductivity ($\sim$ -21K/at.% Mn) in these compounds is a consequence of pair breaking effects due to moment formation on Mn.

arXiv comment9 figures, Accepted for publication in Physical Review B, Added references

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• Carbon isotope effect in superconducting MgCNi_3
• The Effect of Ru substitution for Ni on the superconductivity in MgCNi3-xRux
• The effect of {11}^B substitution on the superconductivity in MgCNi3
• The effect of Fe and Ru substitution for Ni on the thermopower in MgCNi_3
• Compositional disorder and its influence on the structural, electronic and magnetic properties of MgC(Ni_{1-x}Co_{x})_{3} alloys using first-principles
• Optical properties of $MgCN{i}_3$ in the normal state