High temperature far-infrared dynamics of orthorhombic NdMnO<sub>3</sub>: emissivity and reflectivity

Massa, N. E.; Campo, Leire del; Meneses, D. De Sousa; Echegut, Patrick; Martı́nez-Lope, M. J.

doi:10.1088/0953-8984/25/23/235603

Cited by 7 publications

(27 citation statements)

References 29 publications

(83 reference statements)

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“…Very recently, we found that those bands match our lower frequency reflectivity for RMnO 3 (R=Rare Earth) [36]. Accordingly, here we propose that in The dielectric function, ε (ω), [37] above ~T N~TC is then given by…”

Section: Ii) Far Infrared Reflectivitysupporting

confidence: 74%

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Massa¹,

García–Flores²,

Meneses³

et al. 2012

J. Phys.: Condens. Matter

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We report on electronic collective excitations in RMn 2 O 5 (R= Pr, Sm, Gd, Tb) showing condensation starting at and below ~T N~TC~4 0-50 K. Its origin is understood as partial delocalized e g electron orbitals in the Jahn-Teller distortion of the pyramids dimmer with strong hybridized Mn 3+ -O bonds. Our local probes, Raman, infrared, and X-ray absorption, back the conclusion by which there is no structural phase transition at T N~TC . Ferroelectricity is magnetically assisted by electron localization triggering lattice polarizability by unscreening.We have also found phonon hardening as the rare earth is sequentially replaced.

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Section: Ii) Far Infrared Reflectivitysupporting

confidence: 74%

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Massa¹,

García–Flores²,

Meneses³

et al. 2012

J. Phys.: Condens. Matter

Self Cite

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“…Then its use in calculating the sample temperature (eq (1)) is not reliable as for temperature reading. [20]. As it is shown in fig.…”

Section: I)mentioning

confidence: 81%

“…Recently discussed for NdMnO 3 , [20] that environment trails its origin to the orbital disordered primordial perovskite lattice in which background e g electrons are in fluctuating d-orbitals [34,35]. The consequence of orbital electron dynamics in hybridized oxygen-manganese distorted e g orbitals implies embedded minute orbital misalignments.…”

Section: Iv) Thz Hybrid Soft Modesmentioning

confidence: 98%

“…3 (a) and table I, the spectrum fit for 1-E in the centrosymmetric phase, above the ~1600 K phase transition, needs the explicit introduction of an overdamped Drude term indicating the presence of leakage currents by defects. The Christiansen inflexion point [20] that it is still present at about 750 cm -1 now is at a finite reflectivity distorted by the appearance of somehow delocalized carriers in the background. Then its use in calculating the sample temperature (eq (1)) is not reliable as for temperature reading.…”

Section: I)mentioning

confidence: 99%

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Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO₃

Massa¹,

Campo²,

Meneses³

et al. 2014

J. Phys.: Condens. Matter

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We report on temperature dependent TmMnO 3 far infrared emissivity and reflectivity spectra from 1910 K to 4 K. At the highest temperature the number of infrared bands is lower than that predicted for centrosymmetric P6 3 /mmc (D 6h 4 ) (Z=2) space group due high temperature anharmonicity and possible defect induced bitetrahedra misalignments. On cooling, at ~1600 ± 40 K, TmMnO 3 goes from non-polar to an antiferroelectric-ferroelectric polar phase reaching the ferroelectric onset at the ~700 K.

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“…Existing studies on the family of manganites perovskites, RMnO 3 as a parent of mixed valence perovskites, where R is made up of rare earth elements, such as La, Pr and Nd, were found a few decades ago due to their exotic behavior in electrical and magnetic properties [1,2]. Manganites perovskites were the favorite amongst researchers compared with other families of oxides because of their various possible substitutions that may change their crystal structure and properties [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

et al. 2020

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This study synthesizes the neodymium-based manganites with Bi doping, Nd1−xBixMnO3 (x = 0, 0.25 and 0.50) using the solid-state reaction route. The crystal structural, morphological and magnetic properties were determined using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and AC magnetic susceptibility. The Rietveld refinement confirmed that the compounds were in the single-phase orthorhombic structure of the NdMnO3 with Pbnm space group and lattice parameter b increased with doping from 5.5571 (x = 0) to 5.6787 (x = 0.5). FTIR spectra showed that absorption bands were located within the range of 550–600 cm−1, which corresponded to the Mn–O stretching vibration. FESEM exhibited homogenous compound. The AC magnetic susceptibility measurement studies showed a strong antiferromagnetic (AFM) to paramagnetic (PM) transition existed at 76 K, 77 K and 67 K for samples (x = 0, 0.25 and 0.50), respectively.

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High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity

Abstract: We report on near normal far-and mid-infrared emission and reflectivity of

Cited by 7 publications

References 29 publications

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO₃

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

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High temperature far-infrared dynamics of orthorhombic NdMnO3: emissivity and reflectivity

Abstract: We report on near normal far-and mid-infrared emission and reflectivity of

Cited by 7 publications

References 29 publications

Collective phase-like mode and the role of lattice distortions atTN∼TCin RMn2O5(R= Pr, Sm, Gd, Tb, Bi)

Collective phase-like mode and the role of lattice distortions atTN∼TCin RMn2O5(R= Pr, Sm, Gd, Tb, Bi)

Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO3

Effect of Bi Substitution on Structural and AC Magnetic Susceptibility Properties of Nd1−xBixMnO3

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Resources

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High temperature far-infrared dynamics of orthorhombic NdMnO₃: emissivity and reflectivity

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Collective phase-like mode and the role of lattice distortions atT_N∼T_Cin RMn₂O₅(R= Pr, Sm, Gd, Tb, Bi)

Phonons and hybrid modes in the high and low temperature far infrared dynamics of hexagonal TmMnO₃