Theoretical study of magnetotransport properties of colossal magnetoresistive manganites (Re1−xAxMnO3): A variational treatment

Panwar, Sanjay; Kumar, Vijay; Chaudhary, Amit; Kumar, Rajendra; Singh, Ishwar

doi:10.1016/j.ssc.2015.09.001

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…The hybridization of the Cr 3+ (or Cr 4+ ) 3 d and O 2− 2 p orbitals may lead to a charge‐ordered state in the SCHO compound, which may create a Jahn–Teller distortion. Such structural distortion results in a strong electron–phonon coupling and hence the formation of small polarons, leading to strong dominance of the small polaron hopping model in this temperature range 55 . From the linear fitting of the ln( ρ / T ) versus (1000/ T ) curve in Figure 5D, the E P values for the small polarons hopping were calculated to be 7.81, 1.88, and 0.59 meV, for the temperature regions (I) 88−38 K, (II) 38−12 K, and (III) 12−5 K, respectively.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides

Tang,

Zhu

2023

J Am Ceram Soc.

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Half‐metallic ferromagnets (HMFs) are highly desirable materials for applications in spintronics because of their semiconducting behavior for one spin projection and metallic nature for the other. To operate spintronic devices at room temperature (RT), HMFs should simultaneously have a large saturation magnetization (MS), high magnetic Curie temperature (TC), and a wide half‐metallic gap. However, HMFs that simultaneously fulfill these three criteria are rare. In this work, we report for the first time on the ferrimagnetic double perovskite oxides of Sr2CrHfO6 (SCHO) with a magnetic TC up to 545 K due to the strong Cr3+(↑)Cr4+(↓) antiferromagnetic spin interactions. The combined experimental results confirmed that the SCHO powders crystallized in an orthogonal crystal structure with Pnma symmetry. The SEM images demonstrate that the powders exhibit a spherical morphology with particle sizes between 150 and 250 nm. XPS spectra verified the presence of Sr2+, Cr 3+/Cr4+, and Hf4+/Hfx+ (x < 4) ions in the SCHO powder. Oxygen was present as lattice oxygen and adsorbed oxygen species. At 2 K, the SCHO powder exhibited ferrimagnetic behavior with MS of 0.11 μB/f. u and a magnetic coercive field of 290 Oe. The SCHO ceramics displayed a normal butterfly‐like magnetoresistance‐magnetic field (MR‐H) curve at 2 K due to the intergranular tunneling effect, and the MR (2 K, 7 T) value was −2.05%. The temperature dependence of the resistivity of the SCHO ceramics revealed their semiconducting nature, and the electrical transport data in the temperature range 2−800 K were well fitted by the Mott's variable‐range hopping model, thermal activation model, and small polaron hopping model. Optical measurements demonstrate that the SCHO powders have a direct optical bandgap of 2.25 eV in the visible light window. Having both high TC and a direct optical bandgap (2.25 eV) makes SCHO oxides attractive for use in advanced spintronic devices and solar cells.

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Section: Resultsmentioning

confidence: 99%

Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides

Tang,

Zhu

2023

J Am Ceram Soc.

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Thermal Emittance of $$\hbox {La}_{0.7}\hbox {Ca}_{0.3-x}\hbox {K}_x\hbox {MnO}_3$$ La 0.7 Ca 0.3 -

Fan

Sun²,

2018

Int J Thermophys

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Electrical transport and specific heat properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x=0.00, 0.05 and 0.15) perovskites

Zaidi

Mnefgui

Dhahri

et al. 2016

Ceramics International

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Theoretical study of magnetotransport properties of colossal magnetoresistive manganites (Re1−xAxMnO3): A variational treatment

Cited by 7 publications

References 21 publications

Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides

Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides

Thermal Emittance of $$\hbox {La}_{0.7}\hbox {Ca}_{0.3-x}\hbox {K}_x\hbox {MnO}_3$$ La 0.7 Ca 0.3 -

Electrical transport and specific heat properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x=0.00, 0.05 and 0.15) perovskites

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Theoretical study of magnetotransport properties of colossal magnetoresistive manganites (Re1−xAxMnO3): A variational treatment

Cited by 7 publications

References 21 publications

Microstructure and physical properties of Sr2CrHfO6 ferrimagnetic double‐perovskite oxides

Microstructure and physical properties of Sr2CrHfO6 ferrimagnetic double‐perovskite oxides

Thermal Emittance of $$\hbox {La}_{0.7}\hbox {Ca}_{0.3-x}\hbox {K}_x\hbox {MnO}_3$$ La 0.7 Ca 0.3 -

Electrical transport and specific heat properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x=0.00, 0.05 and 0.15) perovskites

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Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides

Microstructure and physical properties of Sr₂CrHfO₆ ferrimagnetic double‐perovskite oxides