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\begin{document}
\title{Effects of Fe substitution for isoelectronic Ru on the magnetic and transport properties of CeRu$_{2}$Al$_{10}$}
\author{\underline{P. Peratheepan}}
\affiliation{Department of Physics, Eastern University, Chenkalady, Sri Lanka}
\affiliation{Physics Department, University of Johannesburg, Auckland Park, South Africa}
\author{A.M. Strydom}
\affiliation{Physics Department, University of Johannesburg, Auckland Park, South Africa}
\begin{abstract}
We have investigated the effects of magnetic Fe ion substitution in Ce(Ru$_{1-x}$Fe$_{x}$)$_2$Al$_{10}$ on the magnetic and transport properties, when the Kondo insulator CeRu$_{2}$Al$_{10}$ with anomalous antiferromagnetic order at $T_\mathrm{N}$ = 27 K [1] is fully transformed into the archetypal non-ordered Kondo insulator CeFe$_{2}$Al$_{10}$ [2]. The characteristic Kondo temperature $T_\mathrm{K}$ is determined from the magnetic susceptibility, and demonstrates a linear dependence on Fe concentration between 0.6 and 1. With increasing \textit{x}, the positive maximum in the thermoelectric power just below $T_\mathrm{N}$  enhances gradually and reaches up to $\sim$80 $\mathrm{\mu}$V/K (at \textit{T} = 40 K) for \textit{x} = 0.8, which is remarkably as high as $\sim$4 and $\sim$1.5 times the corresponding values in CeRu$_{2}$Al$_{10}$ and CeFe$_{2}$Al$_{10}$ respectively. The magnitude of the lattice thermal conductivity is found to be nearly independent of \textit{x}, while the electronic thermal conductivity on the other hand decreases by an order of magnitude when \textit{x} increases from 0 to 0.8.  We discuss our results in terms of the extreme electronic sensitive nature between CeRu$_{2}$Al$_{10}$ and CeFe$_{2}$Al$_{10}$. 


\textbf{References:}
\begin{spacing}{0.8}

{\scriptsize[1] A.M. Strydom, Physica B \textbf{404} (2009) 2981. }

{\scriptsize[2] Y. Muro et. al, J. Phys. Soc. Jpn. \textbf{78} (2009) 083707.}
\end{spacing}

\end{abstract}
\maketitle

\end{document}
