Small polaron transport and magnetoresistance in sol–gel prepared Nd0.7Sr0.3−xCaxMnO3 (0≤x≤0.3) nanomanganite system

Shinde, Umesh; Singh, L. N.; Srivastava, N. B.

doi:10.1016/j.physb.2014.06.043

Cited by 4 publications

(2 citation statements)

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“…In a recent publication 4,5 there have been few models that can explain the transport mechanism in manganites. Among them, we point out the small polaron hopping (SPH) model and the 3D Mott's variable range hopping (VRH) in the semiconducting region, the adiabatic small polaron hopping mechanism 6 and electron–electron, electron–phonon processes in the metallic region. These laws are very important in manganite research because they very well describe the observed high-temperature variation ( T > T M–Sc ) in the conduction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Dhahri

Hlil

2018

RSC Adv.

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A detailed study of the structural, magnetic, magnetocaloric and electrical effect properties in polycrystalline manganite La 0.5 Sm 0.1 Sr 0.4 Mn 0.975 In 0.025 O 3 is presented. The X-ray diffraction pattern is consistent with a rhombohedral structure with R 3c space group. Experimental results revealed that our compound prepared via a sol-gel method exhibits a continuous (second-order) ferromagnetic (FM) to paramagnetic (PM) phase transition around the Curie temperature (T C ¼ 300 K). In addition, the magnetic entropy change was found to reach 5.25 J kg À1 K À1 under an applied magnetic field of 5 T, corresponding to a relative cooling power (RCP) of 236 J kg À1 . We have fitted the experimental data of resistivity using a typical numerical method (Gauss function). The simulation values such as maximum resistivity (r max ) and metal-semiconductor transition temperature (T M-Sc ), calculated from this function, showed a perfect agreement with the experimental data. The shifts of these parameters as a function of magnetic field for our sample have been interpreted. The obtained values of b and g, determined by analyzing the Arrott plots, are found to be T C ¼ 298.66 AE 0.64 K, b ¼ 0.325 AE 0.001 and g ¼ 1.25 AE 0.01. The critical isotherm M (T C , m 0 H) gives d ¼ 4.81 AE 0.01. These critical exponent values are found to be consistent and comparable to those predicted by the three-dimensional Ising model with short-range interaction. Thus, the Widom scaling law d ¼ 1 þ g b is fulfilled.

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Section: Introductionmentioning

confidence: 99%

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Dhahri

Hlil

2018

RSC Adv.

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“…8 In the semiconductor region, the transport mechanism is explained by 3D Mott's variable range hopping (VRH) model, small polaron hopping (SPH) model and by the adiabatic small polaron hopping mechanism. 15 Some models can explain the transport mechanism in manganites. However, most of them are only applied to t the prominent change of the electrical resistivity curves (r(T)) in a nite temperature region (above or below T C ).…”

Section: Introductionmentioning

confidence: 99%

Correlation between magnetic and electric properties based on the critical behavior of resistivity and percolation model of La_0.8Ba_0.1Ca_0.1MnO₃ polycrystalline

Gdaiem

Dhahri

et al. 2017

RSC Adv.

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Structural, magnetic and electrical transport properties of the sol-gel derived La1-xCaxMnO3 (0≤x≤0.3) nanoparticles

P.V.

Bitla

Patidar

et al. 2023

Materials Chemistry and Physics

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Small polaron transport and magnetoresistance in sol–gel prepared Nd0.7Sr0.3−xCaxMnO3 (0≤x≤0.3) nanomanganite system

Cited by 4 publications

References 20 publications

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Correlation between magnetic and electric properties based on the critical behavior of resistivity and percolation model of La_0.8Ba_0.1Ca_0.1MnO₃ polycrystalline

Structural, magnetic and electrical transport properties of the sol-gel derived La1-xCaxMnO3 (0≤x≤0.3) nanoparticles

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Small polaron transport and magnetoresistance in sol–gel prepared Nd0.7Sr0.3−xCaxMnO3 (0≤x≤0.3) nanomanganite system

Cited by 4 publications

References 20 publications

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La0.5Sm0.1Sr0.4Mn0.975In0.025O3

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La0.5Sm0.1Sr0.4Mn0.975In0.025O3

Correlation between magnetic and electric properties based on the critical behavior of resistivity and percolation model of La0.8Ba0.1Ca0.1MnO3 polycrystalline

Structural, magnetic and electrical transport properties of the sol-gel derived La1-xCaxMnO3 (0≤x≤0.3) nanoparticles

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Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La_0.5Sm_0.1Sr_0.4Mn_0.975In_0.025O₃

Correlation between magnetic and electric properties based on the critical behavior of resistivity and percolation model of La_0.8Ba_0.1Ca_0.1MnO₃ polycrystalline