Magnetic behavior, Griffiths phase and magneto-transport study in 3d based nano-crystalline double perovskite Pr2CoMnO6

Abstract

Double perovskite (DP) oxide material receive extensive research interest due to exciting physical properties with potential technological application. 3d based DP oxides are promising for exciting physics like magnetodielectric, ferroelectric, Griffith phase etc., specially Co/Mn DPs are gaining much research interest. In this paper we present the study of magnetic phase and transport properties in nano-crystalline Pr2CoMnO6 a 3d based double perovskite compound. This material shows a paramagnetic (PM) to ferromagnetic (FM) phase transition below 173 K marked by a rapid increase in magnetic moment due to spin ordering. We found divergence in inverse magnetic susceptibility (χ −1 ) from Curie weiss behavior around 206 K which indicates the evolution of Griffiths phase before actual PM-FM transition. We found that the Griffiths phase suppressed with increasing applied magnetic filed. For the understanding of charge transport in this material we have measured temperature dependent electrical resistivity. Pr2CoMnO6 is a strong insulator where resistivity increase abruptly below magnetic phase transition. To understand the effect of magnetic field on transport behavior we have also measured the magnetoresistance (MR) at different temperatures. Sample shows the negative MR with maximum value ∼22 % under applied magnetic field of 50 kOe at 125 K. MR follows quadratic field dependency above Tc however below Tc the MR shows deviation from this field dependency at low field.

Magnetocaloric effect and Griffiths phase analysis in a nanocrystalline Ho2NiMnO6 and Ho2CoMnO6 double perovskite

“…Both HNMO and HCMO compounds show the presence of the Griffiths phase. The evolution of such phase in Ho 2 NiMnO 6 was reported by Bhatti et al 29 and our previous work. The GP follows a power law,…”

“…26,27 These DP compounds contain Co 2+ ions with electronic conguration d 7 tse 2 g and Mn 4+ with electronic conguration d 3 t 2 g 3 e 0 g , which exhibit ferromagnetic ordering due to Co 2+ and Mn 4+ superexchange interactions. 28,29 These types of DP compounds are mostly ferromagnetic and insulating, with the formation of ferromagnetic cluster. The evolution of a Griffiths-like phase is observed in the paramagnetic region for some cases.…”

Expansion of the multifunctionality in off-stoichiometric manganites using post-annealing and high pressure: physical and electrochemical studies

“…θ Shows the positive values for all LMO, which indicates the dominant FM interactions in them. The LMO-1150 sample is the most magnetically homogeneous, whereas other specimens indicate the Griffiths phase, 60–63 which exists from T C to T G and achieves the range of 173 K for LMO-1250, 167 K for LMO-1350, and 161 K for LMO-1450. All LMO demonstrate the increased values of μ exp eff compared to μ theor eff , which may be explained by the existence of short-range FM clusters and/or the localization of e g -electrons on Mn-sites in the PM phase.…”

Exotic magnetic properties in Zintl phase BaVSe3: a theoretically supported experimental investigation

“…Another major analysis technique used to probe for the presence of the GP is the Arrott plot, in which the square of magnetization ( M 2 ) is plotted as a function of H / M . 58 Fig. 8(d) shows the Arrott plot at 43 K, which is well above T R C (17 K) and below T G (116 K).…”