Properties of the ferrimagnetic double perovskites A<sub>2</sub>FeReO<sub>6</sub>(A = Ba and Ca)

Prellier, W.; Smolyaninova, Vera N.; Biswas, Amlan; Galley, Chad R.; Greene, R. L.; Ramesha, K.; Gopalakrishnan, J.

doi:10.1088/0953-8984/12/6/318

Cited by 102 publications

(99 citation statements)

References 31 publications

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“…Intergrain tunelling magnetoresistance measurements given in Fig. 4(d) indicate a reorientation of the magnetic domains parallel to applied fields consistent with previous results [14,15]. Since this experiment was performed in a pelletized polycrystalline sample, the magnetic moments must be reoriented without a physical rotation of the grains.…”

supporting

confidence: 88%

“…In this work, we investigate the phonon behavior of Re-based half-metallic ferrimagnetic double perovskites through the magnetic ordering transition by means of Raman spectroscopy. Ba 2 FeReO 6 (BFRO) and Sr 2 CrReO 6 (SCRO) were chosen for being ferrimagnets with T c = 305 [7,14,15] and ∼ 600 − 635 K [16][17][18], respectively, with cubic double perovskite structures at the paramagnetic state [7,[17][18][19][20].…”

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confidence: 99%

“…The synthesis and characterization of the BFRO ceramic sample are described elsewhere [7,14,19] A and indicate a single phase with cubic double perovskite structure (space group F m3m) at 350 K. Magnetization measurements were performed with a commercial vibrating sample magnetometer under field cooling and confirmed the magnetic ordering below T c = 605 K for SCRO. The degrees of antisite disorder are 4(1) % for BFRO [7] and 16(1) % for SCRO.…”

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confidence: 99%

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Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites

García–Flores¹,

Moreira²,

Kaneko³

et al. 2012

Phys. Rev. Lett.

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A remarkable hardening (∼ 30 cm −1 ) of the normal mode of vibration associated with the symmetric stretching of the oxygen octahedra for the Ba 2 FeReO 6 and Sr 2 CrReO 6 double perovskites is observed below the corresponding magnetic ordering temperatures. The very large magnitude of this effect and its absence for the anti-symmetric stretching mode provide evidence against a conventional spin-phonon coupling mechanism. Our observations are consistent with a collective excitation formed by the combination of the vibrational mode with oscillations of local 3d and 5d occupations and spin magnitudes.

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confidence: 99%

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Spin-Electron-Phonon Excitation in Re-based Half-Metallic Double Perovskites

García–Flores¹,

Moreira²,

Kaneko³

et al. 2012

Phys. Rev. Lett.

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“…In this paper, we focus on metallic ordered DPs with mixed 3d/5d transition metal ions on the B/B' sites, specifically the Ba 2 FeReO 6 material, 29,30 with the structure as shown in Fig.1. we obtain the following main results.…”

Section: -28mentioning

confidence: 99%

Theory of metallic double perovskites with spin-orbit coupling and strong correlations: Application to ferrimagnetic Ba2FeReO6

Cook

Paramekanti

2013

Phys. Rev. B

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We consider a model of the double perovskite Ba2FeReO6, a room temperature ferrimagnet with correlated and spin-orbit coupled Re t2g electrons moving in the background of Fe moments stabilized by Hund's coupling. We show that for such 3d/5d double perovskites, strong correlations on the 5d-element (Re) are essential in driving a half-metallic ground state. Incorporating both strong spin-orbit coupling and the Hubbard repulsion on Re leads to a band structure consistent with ab initio calculations. Using our model, we find a large spin polarization at the Fermi level, and obtain a semi-quantitative understanding of the saturation magnetization of Ba2FeReO6, as well as X-ray magnetic circular dichroism data indicating a significant orbital magnetization. Based on the orbital populations obtained in our theory, we predict a specific doping dependence to the tetragonal distortion accompanying ferrimagnetic order. Finally, the combination of a net magnetization and spin-orbit interactions is shown to induce Weyl nodes in the band structure, and we predict a significant intrinsic anomalous Hall effect in hole-doped Ba2FeReO6. The uncovered interplay of strong correlations and spin-orbit coupling lends partial support to our previous work, which used a local moment description to capture the spin wave dispersion found in neutron scattering measurements. Our work is of interest in the broader context of understanding metallic double perovskites which are of fundamental importance and of possible relevance to spintronic applications.

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“…For the do ubl e p ero vski tes, the system (Sr 1 À y Cay ) 2 FeReO6 i s an excepti on of the general rul e [60]: here, the Ca 2 FeReO6 com pound ha s the hi ghest T C , al tho ug h the to l erance facto r decreases conti nuousl y fro m f = 0 9 9 7 f or Sr 2 FeReO 6 to = 0 9 4 3 for Ca 2 FeReO 6 on substi tuti ng Sr by Ca . We note, ho wever, tha t CaFeReO 6 i s a uni que materi al as i t i s a f erro magneti c i nsul ato r and tha t there m ay be an other m echani sm causing the hi gh orderi ng tem p erature [23 ].…”

Section: Magnet I C Prop Er Ti Esmentioning

confidence: 80%