Effect of Fe doping in polycrystalline La0.7Sr0.3MnO3 on transport and magnetic properties

Xavier, M. M.; Cabral, Fernando A.; Araújo, J.H. de; Chesman, C.; Dumelow, T.; Sasaki, J. M.

doi:10.1016/s0304-8853(01)00076-2

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…As can be seen from this figure, the obtained XRD patterns match with the Rietveld refinement curves, specifying that the sample has a rhombohedral structure (in space group R c 3̅ ). Notably, the substitution of 5% Fe for Mn in FM metallic La 0.7 Sr 0.3 MnO 3 shows no change in the structure because of their similar ionic radii, which is consistent with earlier reports [15,19,20,40]. The goodness of fit (χ 2 ) value was less than 2, further confirming a good fit between the experimental pattern and refinement result.…”

Section: Resultssupporting

confidence: 89%

“…Furthermore, the electronic configuration of Fe 4+ ions is t e , g g 2 3 1 which affects the e g band and allows Fe 4+ ions to participate in the double exchange [15]. However, most studies indicate that iron ions do not participate in double-exchange interactions [19,20], hence, both types of substitution lead to a reduction in the ferromagnetism within the system. Extensive investigations have revealed that numerous iron-doped manganite compounds exhibit increased relative cooling power (RCP), broadening of the operating temperature range, and reduced thermal and magnetic hysteresis [19,21].…”

Section: Introductionmentioning

confidence: 99%

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Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Thanh,

Van Quynh,

Thi Ngoc Nha

et al. 2023

Phys. Scr.

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The magnetic behavior of the La0.7Sr0.3Mn0.95Fe0.05O3 nanoparticles was investigated. X-ray diffraction analysis revealed that this sample exhibited rhombohedral symmetry with R3-c space group. The sample underwent a ferromagnetic-paramagnetic transition at approximately 290 K, characterized by a second-order phase transition. Interestingly, the state above the transition temperature is not purely paramagnetic but rather exhibits a short-range ferromagnetic order or Griffiths phase, which becomes more pronounced as the temperature increases up to the Griffiths transition temperature (∼345 K). The values of the critical exponents obtained in this study, β = 0.671, γ = 1.087, and δ = 2.612, with TC = 290.09 K, are distinct from those of any known universality class, and are confirmed by a single scaling equation of state. This unusual behavior is ascribed to the existence of the Griffiths phase, which reflects the unconventional critical behavior of magnetic susceptibility. In addition to conventional magnetic measurements, detailed studies of isothermal magnetization and magnetocaloric effects have been performed, and theoretical analyses have been utilized to further explore the Griffiths phase. Furthermore, a correlation between the Griffiths phase and the anomalous critical parameters was established.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Thanh,

Van Quynh,

Thi Ngoc Nha

et al. 2023

Phys. Scr.

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“…The hopping of electrons between Fe 2+ and Fe 3+ ions on the octahedral sites gives 0022-3727/03/030217+06$30.00 © 2003 IOP Publishing Ltd Printed in the UK rise to the conductivity in the compound [13]. Although the effects of the substitution of Mn 3+ ions with Fe 3+ have been reported [14,15], the electrical transport behaviour of composites (1 − x)La 0.67 Ca 0.33 MnO 3 +xFe 3 O 4 formed with a lower Fe 3 O 4 doping level have rarely been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of low Fe₃O₄doping in La_0.67Ca_0.33MnO₃

Xia

Yuan

Zhang

et al. 2003

J. Phys. D: Appl. Phys.

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The electrical and magnetic transport behaviour of composite samples of (1 − x)La 0.67 Ca 0.33 MnO 3 + xFe 3 O 4 with x = 0, 0.1%, 1% and 2% were studied in a temperature interval 10-300 K and for magnetic fields H = 0, 0.3, 0.5, 1 and 3 T. The temperature and magnetic field dependence of resistivity of composites show that the low Fe 3 O 4 doping levels have important effects on electrical and magnetic transport behaviour of La 0.67 Ca 0.33 MnO 3 . Especially, compared to pure La 0.67 Ca 0.33 MnO 3 , a new insulator-metal (I-M) transition was observed at a lower temperature T P2 in all Fe 3 O 4 doped La 0.67 Ca 0.33 MnO 3 composites, which may result from the existence of a new phase related to Fe 3 O 4 dopant at grain boundaries and surfaces of La 0.67 Ca 0.33 MnO 3 phases. It is of interest to note that the new I-M transition temperature, T P2 , is almost independent of the magnetic field. Meanwhile, an obvious magnetoresistance effect was observed between temperatures T P1 and T P2 . The results were discussed by considering the results of scanning electron microscopy, x-ray diffraction, dielectric relaxation and susceptibility analysis.

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Electrical transport behavior of La0.67Ca0.33MnO3/Fe3O4 composites

Xia¹,

Yuan²,

Feng³

et al. 2003

Solid State Communications

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Effect of Fe doping in polycrystalline La0.7Sr0.3MnO3 on transport and magnetic properties

Cited by 4 publications

References 8 publications

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Effect of low Fe₃O₄doping in La_0.67Ca_0.33MnO₃

Electrical transport behavior of La0.67Ca0.33MnO3/Fe3O4 composites

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Effect of Fe doping in polycrystalline La0.7Sr0.3MnO3 on transport and magnetic properties

Cited by 4 publications

References 8 publications

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La0.7Sr0.3Mn1−xFexO3 (x = 0.05) nanoparticle

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La0.7Sr0.3Mn1−xFexO3 (x = 0.05) nanoparticle

Effect of low Fe3O4doping in La0.67Ca0.33MnO3

Electrical transport behavior of La0.67Ca0.33MnO3/Fe3O4 composites

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Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Correlation between critical magnetic behavior and griffiths phase in ferromagnetic La_0.7Sr_0.3Mn_1−xFe_xO₃ (x = 0.05) nanoparticle

Effect of low Fe₃O₄doping in La_0.67Ca_0.33MnO₃