Structure and magnetic transport properties of GdIn3−xMnx intermetallics

The crystal structures and magneto-transport properties of GdIn3−xMnx have been investigated using X-ray diffraction and magnetic and electric measurements. GdIn3−xMnx crystallize in cubic structure, and their lattice parameters tend to decrease with increasing Mn content due to the size effect at In site by Mn substitution for In. Mn doped GdIn3−xMnx order antiferromagnetically at low temperature. However, Mn doping into GdIn3 causes the decrease of Néel temperature due to the distortion of Gd(In,Mn)3 tetrahedron formed by Gd at corners and (In,Mn) at face centers in unit cell. The resistivities of GdIn3−xMnx are going up with increasing Mn content. The electric phase transition is associated with the magnetic transition, and the magneto-transport follows electron-magnon scattering model in low temperature region and the Stoner spin fluctuation model in high temperature region, respectively.