Suppression of the current leakage in charge ordered Lu2Fe2Fe1−xMnxO7 (<x≤0.86)

Abstract

The ferroelectricity, magnetic properties, and charge-ordering modulations in the layered Lu2Fe2Fe1−xMnxO7 have been investigated for x ranging from 0 to 0.86. Experimental measurements reveal that substitution of Mn for Fe could evidently influence the low temperature magnetic transition. Moreover, ferroelectric analysis suggests that introduction of Mn ions in this layered system can efficiently suppress the conducting leakage and result in clear hysteresis loops in the polarization–electric field switching curves. The charge ordering states in Lu2Fe2Fe1−xMnxO7 characterized by two incommensurate modulations has been observed and discussed in association with the local spontaneous polarizations.

Electronic ferroelectricity, charge ordering and structural phase transitions in LuFe2O4(LuFeO3)n (n = 0 and 1)

“…TEM investigations also reveal that this transition is reversible, though remarkable hysteresis often exists, the superstructure reflections become visible again as the temperature is lowered below the critical temperature. Figure 3f shows a typical diffraction pattern taken from a Lu 2 Fe 2 Fe 0.2 Mn 0.86 O 7 sample that shows a clear hysteresis loop in the polarization-electric field switching curves [18]. Like Lu 2 Fe 3 O 7 , the superstructure spots can be similarly assigned to the incommensurate q 1 and q 2 modulations.…”

“…In our recent study, we performed systematic measurements of the polarization switching in Lu 2 Fe 2 Fe 1-x Mn x O 7 samples with x ranging from 0 to 0.86. The experimental results demonstrate that the current leakage can be significantly suppressed in the samples as the Fe is partially replaced by Mn [18]. Figure 2e shows a hysteresis P-E loop taken at room temperature, illustrating the ferroelectric nature of the Lu 2 Fe 2 Fe 0.2 Mn 0.86 O 7 material.…”

“…Status Solidi B 247, No. 4 (2010) 873 Figure 2f shows an experimental result obtained at about 50 K with a visible hysteresis loop [18]. Moreover, our TEM investigations on the Lu 2 Fe 2 Fe 1-…”

Microstructure and oxidation states in multiferroic Lu2(Fe,Mn)3O7

“…12,13 One effective approach to suppress the current leakage is to introduce carrier doping and intercalated layers. 14,15 The intercalation of FeO 1.5 single layer (V layers) into between two Fe 2 O 2.5 double layers (W layers), i.e., the compound Lu 2 Fe 3 O 7 (the inset in Fig. 1), is an effective approach to tune the dielectric properties and magnetism in this family; furthermore, it has been found that Mn doping can reduce the conductivity and thus improve the ferroelectric property in Lu 2 (Fe,Mn) 3 O 7 .…”

Dielectric relaxation and polaronic hopping in Mn-substituted LaSrNiO4 nickelates prepared by mechanical milling method

“…Li et al [15] have reported the decrease of bulk conductivity in Mn-doped CaCu3Ti4O12. Qin et al [16] have reported that the introduction of Mn ions into Lu2Fe2Fe1-xMnxO7 can efficiently suppress the electrical conducting leakage. After analyzing the relationship between the electrical resistivity and Mn 3+ content in La0.7Ca0.3MnO3 thin films, De Teresa et al [17] found that the polaron binging-energy is proportional to the Mn-O octahedral distortion.…”