Effects of magnetic site disorder of the 1-D Ising spin chain compounds Ca$_{3}$(Co,Mn)$_{2}$O$_{6}$ with dilute doping

The spin chain compound Ca$_{\mathrm{3}}$Co$_{\mathrm{2}}$O$_{\mathrm{6}}$ has been extensively studied due to a number of unusual properties originating from geometrically frustrated Ising-like spin chains arranged in a triangular lattice. These quasi one dimensional structures provide an ideal environment to study dilute magnetic disorder in spin-glass like systems. Disorder controlled via chemical doping has been observed to weaken the spin glass behavior and disrupt a number of metamagnetic transitions found in pristine Ca$_{\mathrm{3}}$Co$_{\mathrm{2}}$O$_{\mathrm{6}}$. We report a systematic study of the effects of dilute Mn doping ($x \quad =$ 0.05 -- 0.50) in Ca$_{\mathrm{3}}$Co$_{\mathrm{2-x}}$Mn$_{\mathrm{x}}$O$_{\mathrm{6}}$ synthesized via a sol-gel method. Detailed AC and DC magnetization measurements performed on a SQUID magnetometer reveal the suppression of the step-like metamagnetic transitions by a doping of $x \quad =$ 0.25. The relaxation time is found to decrease with increasing Mn content, showing the destruction of the spin-glass like behavior. Our observations yield new insight into the role of site disorder on the glassy behavior in spin chain systems.