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Anisotropy in the magnetic and transport properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Sb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Anisotropic magnetic and electronic transport measurements were carried out on large single crystals of ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{Sb}}_{2}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}1)$. The semiconducting state of $\mathrm{Fe}{\mathrm{Sb}}_{2}$ evolves into metallic and weakly ferromagnetic by substitution of Fe with Co for $x<0.5$. Further doping induces structural transformation from orthorhombic $Pnnm$ structure of $\mathrm{Fe}{\mathrm{Sb}}_{2}$ to monoclinic $P21โc$ structure โฆ