Structural and magnetic properties of La₂Ni_1−x Zn _x MnO₆ compounds

Abstract

Compounds of a randomly diluted ferromagnetic system La 2 Ni 1−x Zn x MnO 6 (LNZ x MO) (x = 0.2, 0.4, 0.6, 0.8) have been synthesized by Sol-gel technique. These compounds possess monoclinic structure (P2 1 /n, space group number 14) at room temperature. Below the Curie temperature (T C ), LNZ x MO are soft ferromagnets with low values of remanent magnetization (M r ) and coercivity (H c ) for x less than equal to 0.6. The exchange interaction is of short range nature. Freezing of clusters is observed in LNZ 0.8 MO below T = 10 K. Although, LNZ x MO is a randomly diluted ferromagnetic system, no signature of Griffiths phase (GP) is found.6 4 , S = 0) and both ions have comparable ionic radii. So we expect magnetic dilution effect with relatively small change in structural properties.