Electrical transport properties and enhanced broad-temperature-range low field magnetoresistance in LCMO ceramics by Sm2O3 adding

Li, Junfeng; Chen, Qingming; Yang, Sheng’an; Yan, Kaikai; Zhang, Hui; Liu, Xiang

doi:10.1016/j.jallcom.2019.03.169

Cited by 22 publications

(9 citation statements)

References 36 publications

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“…The presence of α-Fe2O3 phase is represented by the peaks with hkl plane (012), (110), (024), (116) and (300). Hence, we can deduce that the α-Fe2O3 nanoparticle is mainly segregated at the grain boundaries and/or the surface of LCMO grains where similar observation also reported by the previous studies [6,9] Solid State Phenomena Vol.317 67 Fig. 1.…”

Section: Resultssupporting

confidence: 88%

“…In this work, nano-sized iron oxide (α-Fe2O3) is added into lanthanum calcium manganite (La0.7Ca0.3MnO3) to act as an insulating barrier. This approach has been widely adopted by researchers to create the spin disorder at grain boundaries in order to facilitate LFMR effect [5,6]. Although the addition of oxide as the secondary phase is capable in LFMR enhancement but it might influence the physical properties (TMI & TC) of manganite composites [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Structural and Electrical Properties of La0.7Ca0.3MnO3 /α-Fe2O3 Composites

Lau

Lim

Ishak

et al. 2021

SSP

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Colossal magnetoresistive (CMR) materials have huge potential in modern application and it has been widely used in magnetic sensing industry. From the literature, an incorporation of secondary insulating phase into mixed-valence manganites could improve its extrinsic effect especially low-field magnetoresistance (LFMR). However, nanoparticle addition could lead to substitution and diffusion with its parent compound. In this work, the structural and electrical properties of La0.7Ca0.3MnO3 (LCMO) were investigated by adding the α-Fe2O3 nanoparticle with ratio of 0.00, 0.05, 0.10, 0.15 and 0.20 as the artificial grain boundaries. The LCMO compound has been synthesised using sol-gel route. The samples were chosen to sinter at 800°C to obtain the pure LCMO phase by referring to the thermogravimetric analysis (TGA). The structural properties were investigated by an X-ray diffractometer (XRD) while electrical properties were measured by a four-point probe (4PP) system. XRD patterns showed the coexistence of two phases (LCMO & α-Fe2O3). LCMO crystallised in orthorhombic structure with space group Pnma while α-Fe2O3 exhibited in hexagonal form with space group R-3c. As the content of α-Fe2O3 increases, the resistivity of the samples increases drastically. Nevertheless, the addition of iron oxide has no significant effect on the metal-insulator transition temperature (TMI). From the XRD and 4PP analysis, it can be deduced that the α-Fe2O3 nanoparticles do not react with LCMO compound and successfully formed the La0.7Ca0.3MnO3 /α-Fe2O3 composites. The resistivity increases when the nano-sized α-Fe2O3 is added into LCMO nanocomposites due to the insulator nature of α-Fe2O3.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Structural and Electrical Properties of La0.7Ca0.3MnO3 /α-Fe2O3 Composites

Lau

Lim

Ishak

et al. 2021

SSP

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“…In the same LCKMO ceramics (x = 0, 0.01, 0.03, 0.05, 0.10) doped with Sm 2 O 3 , the temperature dependence of resistivity showed a double I-M transition for x ≥ 0.03 and a single I-M one for x ≥ 0.05 with broad transition width at low temperature. Effects of Sm 2 O 3 -adding showed the enhanced transversal low-field magnetoresistance at low applied magnetic field of 300 and 500 mT over a broad temperature range of below ~260 K [20].…”

Section: Introduction mentioning

confidence: 98%

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

et al. 2020

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Gd 3+-doped lead molybdato-tungstates with the chemical formula of Pb 1-3x x Gd 2x (MoO 4) 1-3x (WO 4) 3x (where x = 0.0455, 0.0839, 0.1430, corresponding to 9.53, 18.32, 33.37 mol% of Gd 3+ , respectively, as well as denotes cationic vacancies) were successfully synthesized via combustion route. The XRD and SEM results confirmed the formation of single-phase, tetragonal scheelite-type materials (space group I4 1 /a) with the uniform, spherical and oval grains ranging from 5 to 20 m. Individual grains are strongly agglomerated into big clusters with the size even above 50 m. The magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with characteristic superparamagnetic-like behaviour and the short-range ferromagnetic interactions. The electrical and broadband dielectric spectroscopy studies revealed insulating properties with the residual electrical n-type conduction of 2×10-9 S/m and low energy loss (tan  0.01) below 300 K. Dielectric analysis showed that no dipole relaxation processes in the Gd 3+-doped materials were observed. A fit of dielectric loss spectra of Gd 3+-doped samples by sum of the conductivity and the Havriliak-Negami, Cole-Cole, and Cole-Davidson functions confirmed this effect.

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“…There is no significant change in the lattice constants (a, b, c, V) of LCMO composites. This implies that NiO is segregated on the surface of LCMO grains or at the grain boundaries [14,23]. The average crystallite size, D was calculated by Scherrer's equation below and gathered in Table 2:…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, an introduction of the secondary oxide phase into the manganite system has been adopted by the scientific community as its capability to enhance low field magnetoresistance (LFMR). This approach is favoured by recent research works and has proven as an effective attempt to improve the LFMR as demonstrated by La 0.8 Sr 0.2 MnO 3 :NiO [12], La 0.7 Sr 0.3 MnO 3 : SrFe 12 O 19 [13], La 0.67 Ca 0.33 MnO 3 : Sm 2 O 3 [14], La 0.7 Ca 0.2 Sr 0.1 MnO 3 : MgO [15], La 0.7 Ca 0.3 MnO 3 : Al 2 O 3 [16], La 0.7 Sr 0.3 MnO 3 : AZO [17] and La 0.7 Sr 0.3 MnO 3 : ZnO [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of NiO Nanoparticle Addition on the Structural, Microstructural, Magnetic, Electrical, and Magneto-Transport Properties of La0.67Ca0.33MnO3 Nanocomposites

et al. 2021

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Incorporation of the secondary oxide phase into the manganite composite capable of enhancing low-field magnetoresistance (LFMR) for viability in high-performance spintronic applications. Polycrystalline La0.67Ca0.33MnO3 (LCMO) was prepared via the sol–gel route in this study. The structural, microstructural, magnetic, electrical, and magneto-transport properties of (1−x) LCMO: x NiO, x = 0.00, 0.05, 0.10, 0.15 and 0.20 were investigated in detail. The X-ray diffraction (XRD) patterns showed the coexistence of LCMO and NiO in the composites. The microstructural analysis indicated the amount of NiO nanoparticles segregated at the grain boundaries or on the surface of LCMO grains increased with the increasing secondary phase content. LCMO and NiO still retained their individual magnetic phase as observed from AC susceptibility (ACS) measurement. This further confirmed that there is no interfacial diffusion reaction between these two compounds. The NiO nanoparticle acted as a barrier to charge transport and caused an increase in resistivity for composite samples. The residual resistivity due to the grain/domain boundary is responsible for the scattering mechanism in the metallic region as suggested by the theoretical model fitting, ρ(T)=ρ0+ρ2T2+ρ4.5T4.5. The magnetoresistance values of LCMO and its composites were found to increase monotonically with the decrease in temperature. Hence, the LFMR was observed. Nonetheless, the slight reduction of LFMR in composites was attributed to the thick boundary layer created by NiO and impaired the spin polarised tunnelling process.

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Electrical transport properties and enhanced broad-temperature-range low field magnetoresistance in LCMO ceramics by Sm2O3 adding

Cited by 22 publications

References 36 publications

Structural and Electrical Properties of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> /α-Fe<sub>2</sub>O<sub>3</sub> Composites

Structural and Electrical Properties of La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> /α-Fe<sub>2</sub>O<sub>3</sub> Composites

Combustion synthesis, structural, magnetic and dielectric properties of Gd3+-doped lead molybdato-tungstates

Effect of NiO Nanoparticle Addition on the Structural, Microstructural, Magnetic, Electrical, and Magneto-Transport Properties of La0.67Ca0.33MnO3 Nanocomposites

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