Magneto- and Electrotransport Properties of Nd$_{0.67}$Sr$_{0.33}$Mn$_{1-x}$Fe$_x$O$_3$ ($x$ = 0.00, 0.05)
Simultaneous studies on the magnetic and electrotransport properties of Nd$_{0.67}$Sr$_{0.33}$Mn$_{1-x}$Fe$_x$O$_3$ polycrystalline bulk and epitaxial thin films ($x$ = 0.00 and 0.05) have been carried out. A magnetoresistance (MR) as high as $\sim33\%$ is observed for Nd$_{0.67}$Sr$_{0.33}$MnO$_3$ bulk at the metal-insulator transition (MIT) temperature ($T_p$) of 273 K in a magnetic field ({H}) of 10 kOe. Fe substitution at Mn sites reduces the ferromagnetic (FM) ordering temperature ($T_c$) and leads to an overall increase in MR. MR as high as $\sim90\%$ is observed for thin film ($x$ = 0.05) at {H} = 10 kOe with $T_p$ = 100 K while the corresponding bulk has a MR of only $\sim43\%$. Low field MR in epitaxial thin films also display a pronounced anisotropy effect compared to bulk materials.
cond-mat0208056.tex
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\title{Magneto- and Electrotransport Properties of Nd$_{0.67}$Sr$_{0.33}$Mn$_{1-x}$Fe$_x$O$_3$ ($x$ = 0.00, 0.05)}

\author{Chang Yoke Ling$^a$\thanks{corresponding author: scip0068@nus.edu.sg} C. K. Ong$^a$}

\address{$^a$Department of Physics, Center for Superconducting and
Magnetic Materials, National University of Singapore, 2 Science
Drive 3, 117542 Singapore, Singapore}

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\begin{abstract}
Simultaneous studies on the magnetic and electrotransport
properties of Nd$_{0.67}$Sr$_{0.33}$Mn$_{1-x}$Fe$_x$O$_3$
polycrystalline bulk and epitaxial thin films ($x$ = 0.00 and
0.05) have been carried out. A magnetoresistance (MR) as high as
$\sim33\%$ is observed for Nd$_{0.67}$Sr$_{0.33}$MnO$_3$ bulk at
the metal-insulator transition (MIT) temperature ($T_p$) of 273 K in a
magnetic field ({\bf H}) of 10 kOe. Fe substitution at Mn sites
reduces the ferromagnetic (FM) ordering temperature
($T_c$) and leads to an overall increase in MR. MR as high as
$\sim90\%$ is observed for thin film ($x$ = 0.05) at {\bf H} = 10 kOe with $T_p$ = 100 K while the corresponding bulk has a MR of only $\sim43\%$. Low field MR in epitaxial thin films also display a pronounced anisotropy effect compared to bulk materials. 
\end{abstract}

\pacs{71.30.+h, 71.38.-k, 73.43.Qt, 75.30.Vn}


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