Tailoring The Griffiths-Like Cluster Formation In The Insulator Ferromagnet Spin-Glass Gd2nixco1-Xmno6 Double Perovskite

In this paper we present the effects of the composition on structural, vibrational, magnetic, and electronic properties of double perovskite 3d based manganese oxides Gd2NixCo1-xMnO6 (GNCMO) powder (for 0 < x < 1) prepared by high temperature solid state chemistry. These compounds have a great research interest due to their specific physical properties. We have shown that the synthesized compounds exhibit ferromagnetic interaction between the spins of (Mn4+, Co2+), and (Mn4+, Ni2+) cations via oxygen ions and antiferromagnetic interactions between (Gd3+, Co2+), (Gd3+, Ni2+) and (Gd3+, Gd3+) and present a paramagnetic to ferromagnetic phase transition. The paramagnetic Curie-Weiss temperature of GNCMO (T-c) increases from 121to 128K as the nickel content increases from 0.2 to 0.8. Further, temperature dependent inverse magnetic susceptibility chi(T)(-1) shows deviation from Curie Weiss behavior around T-G which depicts that Griffiths phase already observed in several perovskite compounds. The value of the GP percentage and the exponent of (lambda < 1) are found to increase as the nickel content increases. The hysteresis curve at T = 20K for x = 0.2 displays a metamagnetic transition explained by the reorientation of the Gd spin moments towards theMn, Co, and Ni spin moments. The imaginary part of susceptibility chi '' shows a small shift of the peak similar to 1 K indicating the presence of spin or cluster glass behavior.