Optical spectroscopy of neodymium orthochromite - NdCrO3

Hornreich, R. M.; Komet, Y.; Wanklyn, B.M.

doi:10.1016/0038-1098(72)90301-8

Cited by 18 publications

(3 citation statements)

References 9 publications

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“…The Cr magnetic moments undergo a spin reorientation transition ͑SRT͒ to the G y (⌫ 1 mode͒ at T SRT ϭ35.1 K. Neutron-diffraction measurements 10 allowed us to conclude that Nd-Cr interaction was able to polarize the Nd sublattice at temperatures below T SRT , giving rise to the above-mentioned Schottky anomaly. In spite of an improper correction for the lattice contribution to the specific heat, the splitting of the Nd 3ϩ ground doublet was found to be ⌬ g /k B ϭ27 K. 11 A more quantitative approach was attempted by Hornreich and co-workers, 13,14 who performed, among other experiments, optical spectroscopy measurements on NdCrO 3 as a function of temperature. Their results show a Zeeman splitting of the Nd 3ϩ ground doublet of ⌬ g /k B ϭ25.9 K at 34 K, undergoing a discontinuous drop to ⌬ g /k B ϭ23.6 K when heating just above T SRT .…”

Section: Introductionmentioning

confidence: 99%

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Specific heat and magnetic interactions inNdCrO3

Bartolomé

Castro

et al. 2000

Phys. Rev. B

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The specific heat of NdCrO 3 in the thermal range from 0.3 to 300 K is presented. The magnetic ordering of Cr ions at T N ϭ219Ϯ1 K is observed, as well as the spin reorientation transition ͑SRT͒ at T SRT ϭ34.2 Ϯ0.5 K. The specific heat of the isostructural nonmagnetic compound LaGaO 3 has been subtracted, allowing us to separate and quantify the different magnetic contributions to the specific heat in NdCrO 3. The exchange coupling constant for the Cr-Cr interaction is found to be ͉J Cr ͉/k B ϭ21.7͑7͒ K. The fitting of the Schottky contribution from the thermal depopulation of the Nd 3ϩ 4 I 9/2 ground multiplet allows us to propose a crystalfield energy-level scheme which is in agreement with the available neutron-scattering spectral lines. The intensity of the Nd-Cr magnetic interaction is obtained. Finally, we show that the strength of the Nd-Cr interaction in this compound is of the same order of magnitude as that found in other Nd orthoperovskites, namely, in NdFeO 3 , despite the different Zeeman splitting of the Nd ground doublet in both compounds.

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Section: Introductionmentioning

confidence: 99%

“…The energy of the first excited doublet was also optically measured as E e /k B ϭ114Ϯ7 K. 13,14 Later, Shamir et al determined ⌬ g /k B ϭ28 K and E e /k B ϭ127 K by inelastic neutron scattering at 4.2 K. 15 The line centered at E e was too wide to observe the splitting ⌬ e of the excited doublet.…”

Section: Introductionmentioning

confidence: 99%

Specific heat and magnetic interactions inNdCrO3

Bartolomé

Castro

et al. 2000

Phys. Rev. B

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“…The rare-earth ordering due to weak interactions among R 3+ − R 3+ can be observed at very low temperatures and in some compounds like HoCrO 3 and PrCrO 3 , the rare-earth ordering is not at all observed within the measured temperature range [13]. Few magnetic rare-earth chromites also show magnetization reversal properties due to rare-earth moments and are aligned antiparallel to the chromium magnetic moments [15,18]. The strong among these interactions are Cr 3+ −Cr 3+ responsible for antiferromagnetic ordering in chromites and it is greatly influenced by the rare-earth ionic radius.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the bandgap and magnetic properties by bismuth substitution in neodymium chromite

2017

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The intrinsic distortions present in rare-earth orthochromites (RCrO 3) observed from lanthanum to lutetium (in R-site) can influence the magnetic properties like Neel transition and weak ferromagnetic coupling. A nonmagnetic cation with similar ionic radius would be a suitable candidate to engineer the inherent distortions of particular orthochromite. In this study, bismuth (Bi 3+) with a 6s 2 lone pair was chosen to substitute in neodymium (Nd 3+) site of NdCrO 3 (NCO) to tailor the intrinsic structural distortions. The variation of optical absorption edge evidently suggests that Bi (6s 2) substituted in the magnetic rare-earth Nd 3+ influences the Cr-O overlap integral. The interaction of Bi cation with oxygen bonds influences the structural distortions through Cr-O polyhedral, which are evident from Raman scattering studies. The observed structural and magnetic properties of similar ionic radius of Bi 3+ in Nd 3+ reveal that intrinsic structural distortions are interrelated to enhanced weak ferromagnetic component and change in Neel and spin reorientation temperatures in our compounds. In addition, a reduction in the optical bandgap of NCO from 3.1 to 2.6 eV was observed.

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5.1.5.2 Magnetization and magnetic susceptibilities

Burzo¹

Perovskites I (Part A)

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Optical spectroscopy of neodymium orthochromite - NdCrO3

Cited by 18 publications

References 9 publications

Specific heat and magnetic interactions inNdCrO3

Specific heat and magnetic interactions inNdCrO3

Tailoring the bandgap and magnetic properties by bismuth substitution in neodymium chromite

5.1.5.2 Magnetization and magnetic susceptibilities

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