Adiabatic polaron hopping conduction and Griffiths phase in electron-doped Ca0.85Dy0.15MnO3

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.…”

Enhanced Charge Transport in Ca2MnO4-Layered Perovskites by Point Defect Engineering

“…Charge transport analysis of manganites at temperatures above T C is usually performed in terms of the small polaron hopping model. ,,,,− To extract the activation energy for electron transport from the experimental data, we fit the temperature-dependent electrical conductivity and Seebeck coefficient values to the small polaron hopping model − where σ 0 is a constant determined by the optical phonon frequency, hopping distance, and polaron concentration; E σ is the conduction activation energy; E S is the charge carrier generation energy; and α′ is a constant matching the Heikes expression at the limit of high temperatures. Table summarizes the conduction activation energies and charge carrier generation energies obtained by linear regression of the data in the temperature ranges of 300–700 and 400–1000 K, respectively.…”