Transition-element doping effects in (formula presented)

The influence of transition element (TE) doping on the magnetotransport properties of (Formula presented) is studied for the entire transition element series ((Formula presented) Fe, Co, Ni, Cu, Zn) for a fixed (5% at Mn sites) dopant concentration. The systematics of different properties such as the metal-insulator transition temperature (Formula presented) the Curie temperature (Formula presented) (Formula presented) and the maximum value of magnetoresistance (MR), with respect to lattice parameter and the ionic radii of dopants, are examined. The important findings include an interesting correlation between the maximum MR, the lattice parameter, and the ionic radii, and some distinct features exhibited by Fe, Cu, and Zn dopants. © 1999 The American Physical Society.