Low-temperature Raman, high magnetic field 
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 Mössbauer, and x-ray diffraction study of magnetodielectric coupling in polycrystalline 
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Panchwanee, Anjali; Upadhyay, Sanjay Kumar; Lalla, N. P.; Sathe, Vasant; Gupta, Ajay; Reddy, V. Raghavendra

doi:10.1103/physrevb.99.064433

Cited by 17 publications

(7 citation statements)

References 40 publications

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“…The different intensity of the modes relates to the symmetries and the most intense ones have usually A g symmetry. The broadened band at about 1280 cm -1 can be endorsed as a two-phonon process related to the signal at about 630 cm -1 [28,31]. This scenario appropriately describes that observed for GFO-MW and GFO-P samples.…”

Section: Raman Spectroscopysupporting

confidence: 72%

“…The experimental pattern (blue) is compared with the calculated one (red); in the bottom, the difference curve (grey) and the bars of the expected peak positions for GdFeO 3 are also shown. In the inset, as an example, an enlargement of the 20-35°angular region is shown for GCFO-P sample the literature [27][28][29][30], the room temperature firstorder Raman activity in polycrystalline GdFeO 3 is mainly expected in the region between 100 and 650 cm -1 . In particular, it is possible to discriminate (i) below 200 cm -1 the Raman features related to lattice modes involving Gd vibrations, (ii) between 200 and 400 cm -1 the contribution of different modes, reasonably ascribable to in-phase and out-ofphase FeO 6 rotations, (iii) between 400 cm -1 and 500 cm -1 the bending activity of O(1)-Fe-O(2) and stretching of Fe-O(1) and/or Fe-O(2) and (iv) above 600 cm -1 in-plane stretching modes.…”

Section: Raman Spectroscopymentioning

confidence: 88%

“…Gadolinium orthoferrites crystallize in the Pnma orthorhombic space group (D 2h , 16) [26][27][28]. From the factor group analysis, among the 60 vibrational modes active at the Brillouin centre zone, the Raman activity consists of 24 modes with the following distribution: 7A g ?…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Ruffo

Mozzati

Albini

et al. 2020

J Mater Sci: Mater Electron

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GdFeO3 perovskite attracted large interest in different fields thanks to peculiar magnetic and optical properties that are further tunable by means of doping processes and achievable on both Gd and Fe sites or by properly choosing the synthesis routes. In this paper, nanometric GdFeO3 compounds, undoped and doped with diamagnetic Ca2+ and Mg2+ ions, were synthesized by microwave assisted, sol–gel, and polyol syntheses and characterized by X-ray diffraction, showing solid solutions formation. Raman spectroscopy allowed us to confirm, from peak enlargements, the Ca and Mg substitution on Gd and Fe sites, respectively. The magnetic data showed the presence of magnetic domains as consequence of doping with diamagnetic ions, which seem to play a crucial role in the magnetic activity of the compounds. A superparamagnetic behaviour is evidenced; nevertheless, its intrinsic character is not definitely demonstrated. Indeed, the possible presence of traces of magnetic impurities, which are easily obtainable in these samples, such as iron oxides, must be taken into account.

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Section: Raman Spectroscopysupporting

confidence: 72%

Section: Raman Spectroscopymentioning

confidence: 88%

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Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Ruffo

Mozzati

Albini

et al. 2020

J Mater Sci: Mater Electron

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“… where 8 N A and J 1 denote the number of bonds per mole and exchange constant for the Er-Fe pairs, respectively, and 3 N A and J 2 do the number of bonds per mole by considering the double counting and exchange constant for the Er-Er pairs, respectively 37 . Recent experiment of low- T Raman spectroscopy for the GdFeO 3 reveals that Raman shift for the mode relevant to the motion of Gd 3+ ions occurs below the T Gd and is found to be ∆ω ≈ 1 cm −1 38 . In a theoretical work on the GdFeO 3 , J 1 = 0.03 meV and J 2 = 0.05 meV were also calculated 41 .…”

Section: Resultsmentioning

confidence: 99%

Anisotropic and nonlinear magnetodielectric effects in orthoferrite ErFeO3 single crystals

Kim

Shin

et al. 2020

Sci Rep

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In rare-earth orthoferrites, strongly correlated order parameters have been thoroughly investigated, which aims to find multiple functionalities such as multiferroic or magnetoelectric properties. We have discovered highly anisotropic and nonlinear magnetodielectric effects from detailed measurements of magnetoelectric properties in single-crystalline orthoferrite, ErFeO 3 . Isothermal dielectric constant varies in shapes and signs depending on the relative orientations between the external electric and magnetic fields, which may be ascribed to the spin-phonon couplings. In addition, a dielectric constant with both electric and magnetic fields along the c axis exhibits two symmetric sharp anomalies, which are closely relevant to the spin-flop transition, below the ordering temperature of Er 3+ spins, T Er = 3.4 K. We speculate that the magnetostriction from the exchange couplings between Er 3+ and Fe 3+ magnetic moments would be responsible for this relationship between electric and magnetic properties. Our results present significant characteristics of the orthoferrite compounds and offer a crucial guide for exploring suitable materials for magnetoelectric functional applications.

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“…For example FE distortion is reported in DyFeO 3 below T N,Dy with applied magnetic field [8] and also in the weak ferromagnetic (WFM) state between T SRT,Fe and T N,Fe in zero magnetic field [9]. In GdFeO 3 FE distortion is reported below T N,Gd [10].…”

Section: Introductionmentioning

confidence: 94%

An evidence of local structural disorder across spin-reorientation transition in DyFeO₃: an extended x-ray absorption fine structure (EXAFS) study

Panchwanee¹,

Schiesaro²,

Mobilio³

et al. 2019

J. Phys.: Condens. Matter

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The present work is aimed at exploring the local atomic structure modifications related to the spin reorientation transition (SRT) in DyFeO 3 orthoferrite exploiting x-ray absorption fine structure (XAFS) spectroscopy. For this purpose we studied by XAFS the evolution of the local atomic structure around Fe and Dy as function of temperature (10-300 K) in a DyFeO 3 sample having the SRT around 50-100 K. For sake of comparison we studied a YFeO 3 sample having no SRT. The analysis of the extended region has revealed an anomalous trend of Fe-O nearest neighbour distribution in DFO revealing (i) a weak but significant compression with increasing temperature above the SRT and (ii) a peculiar behavior of mean square relative displacement (MSRD) [σ 2 ] of Fe-O bonds showing an additional static contribution in the low temperature region, below the SRT. These effects are absent in the YFO sample supporting these anomalies related to the SRT. Interestingly the analysis of Dy L 3-edge data also reveal anomalies in the Dy-O neighbour distribution associated to the SRT, pointing out a role of magnetic Re ions across T SRT,Fe. These results point out micro-structural modification at both Fe and Dy sites associated to the magnetic transitions in DFO, it can be stated in general terms that such local distortions across Fe 3+ and magnetic Re 3+ may be present in other orthoferrites exhibiting multiferroic nature.

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Low-temperature Raman, high magnetic field Fe57 Mössbauer, and x-ray diffraction study of magnetodielectric coupling in polycrystalline GdFeO3

Cited by 17 publications

References 40 publications

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Anisotropic and nonlinear magnetodielectric effects in orthoferrite ErFeO3 single crystals

An evidence of local structural disorder across spin-reorientation transition in DyFeO₃: an extended x-ray absorption fine structure (EXAFS) study

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Low-temperature Raman, high magnetic field Fe57 Mössbauer, and x-ray diffraction study of magnetodielectric coupling in polycrystalline GdFeO3

Cited by 17 publications

References 40 publications

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Role of non-magnetic dopants (Ca, Mg) in GdFeO3 perovskite nanoparticles obtained by different synthetic methods: structural, morphological and magnetic properties

Anisotropic and nonlinear magnetodielectric effects in orthoferrite ErFeO3 single crystals

An evidence of local structural disorder across spin-reorientation transition in DyFeO3: an extended x-ray absorption fine structure (EXAFS) study

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Product

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An evidence of local structural disorder across spin-reorientation transition in DyFeO₃: an extended x-ray absorption fine structure (EXAFS) study