Evolution of Griffith's phase in La0.4Bi0.6Mn1−xTixO3 perovskite oxide

Abstract

amples of La0.4Bi0.6Mn1−xTixO3 have been prepared and their microstructure, composition, and magnetic properties have been investigated for x = 0.05, 0.1, and 0.5.The deviation in the inverse susceptibility behavior from Curie-Weiss law and increase in susceptibility exponent indicates the evolution of the Griffith's phase in La0.4Bi0.6Mn1−xTixO3 around TC. The presence of Griffith's Phase is inferred due to magnetic frustration with increasing Ti concentration. The deviation between field cooled and zero field cooled magnetization curves is observed in these samples and is attributed to the appearance of the spin glass or cluster glass state that arises due to the magnetic anisotropy.

Magnetic interaction and electronic transport in La<inf>0.4</inf>Bi<inf>0.6</inf>Mn<inf>0.5</inf>Ti<inf>0.5</inf>O<inf>3</inf> manganite

“…This nature of absence of long range FM interactions around magnetic TC likely leads to a phenomenon called Griffith's phase [4,10]. This is shown by the evidence of the downturn deviation from the characteristic Curie-Weiss linear law and the formation of FM clusters embedded in host PM matrix which is already been reported by us for the aforesaid and similar kind of sample [4,10].…”

“…This is shown by the evidence of the downturn deviation from the characteristic Curie-Weiss linear law and the formation of FM clusters embedded in host PM matrix which is already been reported by us for the aforesaid and similar kind of sample [4,10].…”

“…The electrical transport of the charge carriers in the sample exhibiting semiconducting nature is generally governed by Variable Range Hopping (VRH) mechanism [6,8,10]. It is widely believed that these charge carriers form small polarons connected to local Jahn-Teller (JT) distortions [12] which facilitate the transport by hopping.…”

Critical behavior studies in Ti-substituted lanthanum bismuth perovskite manganites

“…Recently it has been shown that though Ti 4+ prefers to occupy Mn 4+ sites, at high doping levels it also randomly distributed at Mn 3+ sites leading to oxygen non stoichiometry (cation deficiency) or in-homogeneities [10,11]. Thus substitution of Ti should produce strain on Mn 3+ −O−Mn 4+ network by the formation of Mn 3+ −O−Ti 4+ chains.…”

“…In our previous studies we have reported spin glass (SG)/cluster glass (CG) and Griffith's phase behavior at very low and intermediate temperatures in La .ସ Bi . Mn ଵି୶ Ti ୶ O ଷ with x=0.05 and 0.1samples respectively [10,11]. Now in present work we focus on the critical behavior near the magnetic phase transition and their analysis using various techniques such as modified Arrott plot (MAP), Kouvel-Fisher (KF) method, scaling-equation-of-state analysis and the critical magnetization isotherm.…”