High - pressure synchrotron x-ray diffraction study of RMnO<sub>3</sub>(R = Eu, Gd, Tb and Dy) upto 50 GPa

Muthu, D. V. S.; Midgley, A. E.; Scott, Paul R.; Krüger, Michael; Sahu, Jyoti Ranjan; Sood, A. K.; Rao, C. N. R.

doi:10.1088/1742-6596/377/1/012025

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…The anomalies can be explicated by comparing the fitting pressure data of the E3M3 structure tabbed by blue stars in the same panel, calculated with a second-order B-M EOS given below , where V 0 and B 0 have been obtained from eq . The fitting values marked by blue stars are in conformity with the previous experimental reports, , which verified the reliability of the theoretical methods. The deviation of external pressure from the fitting line is caused by the transition from E3M3 to E2M4 under high pressure (positive), which releases some pressure by changing the cell shape and internal distortions to respond to the decrease of volume.…”

Section: Resultssupporting

confidence: 89%

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Liu

Meng

et al. 2021

Inorg. Chem.

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Based on first-principles calculations with the DFT + U method, the couplings of lattice, charge, spin, and electronic behaviors underlying the Eu−Mn charge transfer in a strongly correlated system of EuMnO 3 were investigated. The potential valence transition from Eu 3+ /Mn 3+ to Eu 2+ /Mn 4+ was observed in a compressed lattice with little distortions, which is achieved under hydrostatic pressure and external strain. The intraplane antiferromagnetism (AFM) of Mn is proved to be instrumental in the emergence of Eu 2+ . Furthermore, we calculated the magnetic exchange interactions within two equilibrium structures of

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Section: Resultssupporting

confidence: 89%

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Liu

Meng

et al. 2021

Inorg. Chem.

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“…[16]. This can most probably be accounted for by the pressure-transmitting medium used in that study (ethanol-methanol instead of helium), which produces very strong deviatoric stress above 054104-2 10 GPa.…”

Section: Resultsmentioning

confidence: 81%

“…Recently, we reported synchrotron x-ray diffraction and Raman spectroscopy studies of GdMnO 3 under pressure up to 55 GPa and showed evidence for a first-order structural transition accompanied by an insulator-to-metal transition around 50 GPa [15]. In contrast, Muthu et al [16] have not observed any structural transition at all up to 50 GPa for A = Eu, Gd, Tb, and Dy.…”

Section: Introductionmentioning

confidence: 88%

Dynamic and structural properties of orthorhombic rare-earth manganites under high pressure

et al. 2014

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We report a high-pressure study of orthorhombic rare-earth manganites AMnO 3 using Raman scattering (for A = Pr, Nd, Sm, Eu, Tb, and Dy) and synchrotron x-ray diffraction (XRD), for A = Pr, Sm, Eu, and Dy. In all cases, a phase transition was evidenced by the disappearance of the Raman signal at a critical pressure that depends on the A cation. For the compounds with A = Pr, Sm, and Dy, XRD confirms the presence of a corresponding structural transition to a noncubic phase, so that the disappearance of the Raman spectrum can be interpreted as an insulator-to-metal transition. We analyze the compression mechanisms at work in the different manganites via the pressure dependence of the lattice parameters, the shear strain in the ac plane, and the Raman bands associated with out-of-phase MnO 6 rotations and in-plane O2 symmetric stretching modes. Our data show a crossover across the rare-earth series between two different kinds of behavior. For the smaller A cations considered in this study (Dy and Tb), the compression is nearly isotropic in the ac plane, with only small evolutions of the tilt angles and cooperative Jahn-Teller distortion. As the radius of the A cation increases, the pressure-induced reduction of Jahn-Teller distortion becomes more pronounced and increasingly significant as a compression mechanism, while the pressure-induced tilting of octahedra chains becomes conversely less pronounced. We finally discuss our results in light of the notion of chemical pressure and show that the analogy with hydrostatic pressure works quite well for manganites with the smaller A cations considered in this paper but can be misleading with large A cations.

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Magnetic Structure of Bulk GdMnO₃: Influence of Strain

Hamed

Hoffmann

Adeagbo

et al. 2020

Physica Status Solidi (b)

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Internal structural distortions are of great interest in the determination of electronic and magnetic properties of the strong correlated rare earth manganites. When combined with external structural modifications like uniaxial or biaxial strains, structural distortions can lead to the emergence of new magnetic ground states. This realization is seemingly more probable with the low‐band‐width manganite GdMnO3 on the grounds that it is located in the magnetoelectric phase diagram of orthorhombic rare earth manganites between the A‐type antiferromagnetic (AFM) order and the cycloidal spin orders. Herein, a thorough analysis of the magnetic structure of GdMnO3 based on the density functional theory connected with a classical Heisenberg model together with Monte Carlo calculations is presented. It is found whether a compressive uniaxial strain along the c direction or biaxial strain on the ab plane favors a ferromagnetic (FM) ground state over the AFM one. On the contrary, a tensile strain also on the ab plane is likely to stabilize the E‐type AFM order.

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High - pressure synchrotron x-ray diffraction study of RMnO₃(R = Eu, Gd, Tb and Dy) upto 50 GPa

Cited by 9 publications

References 11 publications

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Dynamic and structural properties of orthorhombic rare-earth manganites under high pressure

Magnetic Structure of Bulk GdMnO₃: Influence of Strain

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High - pressure synchrotron x-ray diffraction study of RMnO3(R = Eu, Gd, Tb and Dy) upto 50 GPa

Cited by 9 publications

References 11 publications

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO3

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO3

Dynamic and structural properties of orthorhombic rare-earth manganites under high pressure

Magnetic Structure of Bulk GdMnO3: Influence of Strain

Contact Info

Product

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High - pressure synchrotron x-ray diffraction study of RMnO₃(R = Eu, Gd, Tb and Dy) upto 50 GPa

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Eu–Mn Charge Transfer and the Strong Charge–Spin–Electronic Coupling Behavior in EuMnO₃

Magnetic Structure of Bulk GdMnO₃: Influence of Strain