Effect of Re doping on structure and magneto-electrical properties of La1.2Re0.2Ca1.6Mn2O7 manganites

Mahamdioua, N.; Amira, A.; Altintas, S.P.; Varılcı, A.; Terzioğlu, C.

doi:10.1016/j.physb.2013.07.027

Cited by 11 publications

(4 citation statements)

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“…The change of MR sign is due to many factors like spin disorder, intergrain spin-polarized tunneling [33], nearly fully spinpolarized carriers tunneling through the insulating ZrO grains [31][32][33][34]. As a result, a positive MR appears [35,36]. We point out that the best sample is Zr x= 0.10 , where MR reaches to 27 % at 123 K Table 3.…”

Section: Resultsmentioning

confidence: 89%

Enhanced electro-magnetic properties in La0.7Sr0.3MnO3/ZrO2 composites

et al. 2014

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La 0.7 Sr 0.3 MnO 3 ) 1-x /(ZrO 2 ) x (x = 0.0-0.150, step 0.025) composites have been prepared via solid state reaction process. The X-ray diffraction and scanning electron microscopic observations indicate that there are ZrO 2 grains separated from La 0.7 Sr 0.3 MnO 3 matrix. It has been found that the inclusion of ZrO 2 content decreases the conductivity, magnetization and metal-semiconductor transition, whereas it increases the low field magnetoresistance. Possible effects of grain boundaries on the low field magnetoresistance have been discussed. The small ZrO 2 grains are trapped between La 0.7 Sr 0.3 MnO 3 grains may be acting as a barrier for spin-polarized tunneling and enhance the low-field magnetoresistance.

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Section: Resultsmentioning

confidence: 89%

Enhanced electro-magnetic properties in La0.7Sr0.3MnO3/ZrO2 composites

et al. 2014

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“…It have been reported by Mahamdioua et al that the Gd-doped La 1.4 Ca 1.6 Mn 2 O 7 DL manganite gives large MR values at 120 K [21]. Moreover, substitution of Ca by Sr keeps the transition temperature to the higher values toward the room temperature [26].…”

Section: Introductionmentioning

confidence: 92%

“…Other investigations on the A-site doped DL manganites were carried out, and it was found that the added element content and its physical characteristics have a significant impact on the structural, electrical, magneto-electrical, and magnetic properties by the introduced elements content and their physical properties [21,16,12]. More investigations on the chemical doping of the Mn site with transition elements, on the Asite and oxygen deficiency, on the synthesis conditions, and on the method effect on manganite properties have been the object of instructive investigations [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it was claimed that a rise in the Pr content resulted in a drop in T C[1].Moreover, Hong Zhu et al reported that these materials have a Curie temperature T C of about 270 K[20]. In a different work, Mahamdioua et al[21] investigated the structural and magneto-electrical properties of the DL La 1.2 RE 0.2 Ca 1.6 Mn 2 O 7 manganites doped with RE = La, Pr, Eu, Y and Gd. They reported that the decrease in ionic radii of the doping elements decreases the unit-cell parameters and the T MI , and increases the resistivity.…”

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confidence: 99%

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On the magnetotransport properties and Griffith phase in (La,Gd)1.4 (Ca,Sr)1.6 Mn2 O7 the double layered manganites

Belguet

Mahamdioua

Meriche

et al. 2023

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The bilayered manganite with formula \({ \text{L}\text{a}}_{1.2}{\text{G}\text{d}}_{0.2}{\text{C}\text{a}}_{1.2}{\text{S}\text{r}}_{0.4}{\text{M}\text{n}}_{2}{\text{O}}_{7}\)has been synthesized by the solid state reaction route with the aim of studying its structural, microstructural, magnetic, electrical and magnetotransport properties. The X-ray diffraction patterns have been analyzed by Rietveld refinement. It revealed that the sample crystallized in a tetragonal structure with the space group I4/mmm and that, as an impurity phase, there were traces of an orthorhombic structure corresponding to a simple perovskite with the space group Pnma. The morphology was examined by using scanning electron microscopy, which revealed that it was porous and granular. The presence and purity of all the constituent elements were confirmed by the Energy Dispersive X-ray spectroscopy investigation. Based on magnetization, the inverse of susceptibility, and hysteresis loop, the magnetic behavior of the compound is discussed in detail. The sample displays a phase transition from ferromagnetic (FM) to paramagnetic (PM) at \({\text{T}}_{\text{C}}\), which was determined to be 290.13 K. Between 305 and 360 K, a Griffith phase (GP) was discovered, indicating the existence ofFM clusters in the paramagnetic domains, and the Griffithtemperature was found to be\(\)339 K. The sample can be thought of as spin-glass-like manganite since a significant divergence wasobserved at low temperatures between the magnetization curves M (T) in the zero-field cooling (ZFC) and field cooling (FC) modes. The spin-glass transition temperature was found to be 261 K. The electrical resistivity under both 0 and 1 T magnetic field exhibits metal-to-insulator transition at \({\text{T}}_{\text{M}\text{I}}\) = 152.98 K. The magnetoresistance was observed to decrease with increasing temperature, peaking at 23% at 11 K under 1 T. Total resistivity in magnetic applied fields of 0T and 1T is composed of residual resistivity, weak localization, and electron-electron combinations below \({\text{T}}_{\text{M}\text{I}}\). Above\({\text{T}}_{\text{M}\text{I}}\) and\({{\theta }}_{\text{D}}/2\) (\({{\theta }}_{\text{D}}\)is Debye temperature), the Mott’s 3D variable range hopping mechanism (3D-VRH) governed the electrical conduction, whereas, the adiabatic small polaron hopping model governed it in the range\({{\theta }}_{\text{D}}/2>\text{T}>300\text{K}\). The density of states, mean hopping energy, and mean hopping distance have all been estimated and thoroughly discussed.

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