Unusual magnetic structure of the high-pressure synthesized perovskites 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mi>CrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow><mml:mo> </mml:mo><mml:mrow><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi>Sc</mml:mi></mml:mrow></mml:math>
, In, Tl)

Ding, Lei; Manuel, Pascal; Khalyavin, D. D.; Orlandi, Fabio; Kumagai, Yu; Oba, Fumiyasu; Yi, Wei; Belik, Alexei А.

doi:10.1103/physrevb.95.054432

Cited by 21 publications

(18 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bond lengths of Tl–O and Ir–O within the TlO 8 polyhedra and IrO 6 octahedra are summarized in Table . The average Tl–O bond length, 2.420 Å, is similar to values for Tl 2 Mn 2 O 7 (2.38 Å), − for TlNiO 3 (2.42 Å), , for TlCrO 3 (2.43 Å), , for TlMnO 3 (2.46 Å), and for Tl 2 Ru 2 O 7 , (2.49 Å) with Tl 3+ O 8 coordination, supporting the nominal Tl 3+ valence state. The average Ir–O bond distances 1.979 Å, which is in reasonable agreement with those for Y 2 Ir 2 O 7 (1.98 Å) and for Pr 2 Ir 2 O 7 (2.01 Å), and Nd 2 Ir 2 O 7 with Ir 4+ O 6 coordination.…”

Section: Resultssupporting

confidence: 63%

“…227), which was reported for other iridium pyrochlores. 22 There was about 1.0% volume fraction of IrO 2 impurity found 60,61 for TlCrO 3 (2.43 Å), 62,63 for TlMnO 3 (2.46 Å), 64 Ir−L 3 XANES. A comprehensive comparison of the Ir−L 3 "white line" (WL) feature of Tl 2 Ir 2 O 7 to those of the standard spectra for Sr 2 CaIrO 6 (Ir 6+ ), Sr 2 ScIrO 6 (Ir 5+ ), Sr 2 YIrO 6 (Ir 5+ ), IrO 2 (Ir 4+ ), and La 2 CuIrO 6 (Ir 4+ ) is shown in Figure 2a.…”

Section: ■ Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

et al. 2021

View full text Add to dashboard Cite

A polycrystalline sample of Tl 2 Ir 2 O 7 was synthesized by high-pressure and high-temperature methods. Tl 2 Ir 2 O 7 crystallizes in the cubic pyrochlore structure with space group Fd3̅ m (No. 227). The Ir 4+ oxidation state is confirmed by Ir−L 3 Xray absorption near-edge spectroscopy. Combined temperaturedependent magnetic susceptibility, resistivity, specific heat, and DFT+DMFT calculation data show that Tl 2 Ir 2 O 7 is a Pauli paramagnetic metal, but it is close to a metal−insulator transition. The effective ionic size of Tl 3+ is much smaller than that of Pr 3+ in metallic Pr 2 Ir 2 O 7 ; hence, Tl 2 Ir 2 O 7 would be expected to be insulating according to the established phase diagram of the pyrochlore iridate compounds, A 3+ 2 Ir 4+ 2 O 7 . Our experimental and theoretical studies indicate that Tl 2 Ir 2 O 7 is uniquely different from the current A 3+2 Ir 4+ 2 O 7 phase diagram. This uniqueness is attributed primarily to the electronic configuration difference between Tl 3+ and rare-earth ions, which plays a substantial role in determining the Ir−O−Ir bond angle, and the corresponding electrical and magnetic properties.

show abstract

Section: Resultssupporting

confidence: 63%

Section: ■ Introductionmentioning

confidence: 97%

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

et al. 2021

View full text Add to dashboard Cite

show abstract

“…On the other hand, in RCrO 3 , t-e hybridization gives a ferromagnetic (FM) component in addition to the existing AFM interaction in the t 3 -O-t 3 orbitals though a superexchange interaction. [34][35][36] As there exist both FM and AFM competing interactions due to t-e hybridization in SmFe x Cr 1Àx O 3 compounds, by the substitution of Cr 3+ for Fe 3+ , the strength of the FM interactions increases and the AFM interactions diminish, which may result in the increase of T N . The results are in good agreement with the report by Kotnana et al 18 Now we discuss the Dzyaloshinskii-Moriya (DM) antisymmetric exchange interaction of the SmFe x Cr 1Àx O 3 samples with weak ferromagnetism.…”

Section: Tablementioning

confidence: 99%

Intrinsic structural distortion and exchange interactions in SmFe_xCr_1−xO₃ compounds

Xiang

Cui

2018

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Perovskites, a fertile playground for the study of strong interplay between spin, orbital and charge degrees of freedom, can accommodate a large variety of cation species due to their flexible crystal structure, giving rise to diverse and fascinating electronic and magnetic properties [1][2][3][4][5][6][7]. In ordered double perovskites, with chemical formula A2BB'O6 (A= rare earth or alkaline, B/B'= transition metal), B and B' cations generally form either rock-salt or layered type superstructure.…”

Section: Introductionmentioning

confidence: 99%

Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study

et al. 2019

Self Cite

View full text Add to dashboard Cite

In the family of double perovskites, colossal magnetoresistance (CMR) has been so far observed only in half-metallic ferrimagnets such as the known case Sr2FeMoO6 where it has been assigned to the tunneling MR at grain boundaries due to the half-metallic nature. Here we report a new material−Tl2NiMnO6, a relatively ordered double perovskite stablized by the high pressure and high temperature synthesis−showing CMR in the vicinity of its Curie temperature. We explain the origin of such effect with neutron diffraction experiment and electronic structure calculations that reveal the material is a ferromagnetic insulator. Hence the ordered Tl2NiMnO6 (~70% of Ni 2+ /Mn 4+ cation ordering) represents the first realization of a ferromagnetic insulating double perovskite, showing CMR. The study of the relationship between structure and magnetic properties allows us to clarify the nature of spin glass behaviour in the disordered Tl2NiMnO6 (~31% of cation ordering), which is related to the clustering of antisite defects and associated with the short-range spin correlations. Our results (L. Ding) † alexei.belik@nims.go.jp (A. A. Belik) highlight the key role of the cation ordering in establishing the long range magnetic ground state and lay out new avenues to exploit advanced magnetic materials in double perovskites. IntroductionPerovskites, a fertile playground for the study of strong interplay between spin, orbital and charge degrees of freedom, can accommodate a large variety of cation species due to their flexible crystal structure, giving rise to diverse and fascinating electronic and magnetic properties [1-7]. In ordered double perovskites, with chemical formula A2BB'O6 (A= rare earth or alkaline, B/B'= transition metal), B and B' cations generally form either rock-salt or layered type superstructure. The former, which leads to alternate stacking of BO6/B'O6 octahedra, is the most common type to minimize the electrostatic energy arising from the different charges of the two cations, and/or the elastic energy due to their different ionic sizes [8-16]. When the radius or the charge of B and B' cations is similar, the probability of antisite (AS) defects (partial occupation of B cations in B' sites and vice versa) increases up to a fully disordered state, effectively tuning the macroscopic properties of the system [11].One of the most intriguing properties of double perovskites is the colossal magnetoresistance (CMR), typically arising from the half-metallic nature of their electronic structures [17][18][19]. For example, half-metallic Sr2FeMoO6 shows a CMR in low magnetic field associated with a ferrimagnetic order above room temperature, providing a promising system for technological applications [17].

show abstract

Unusual magnetic structure of the high-pressure synthesized perovskites ACrO3 (A=Sc , In, Tl)

Cited by 21 publications

References 55 publications

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Intrinsic structural distortion and exchange interactions in SmFe_xCr_1−xO₃ compounds

Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study

Contact Info

Product

Resources

About

Unusual magnetic structure of the high-pressure synthesized perovskites ACrO3 (A=Sc , In, Tl)

Cited by 21 publications

References 55 publications

Tl2Ir2O7: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Tl2Ir2O7: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Intrinsic structural distortion and exchange interactions in SmFexCr1−xO3 compounds

Colossal magnetoresistance in the insulating ferromagnetic double perovskites Tl2NiMnO6: A neutron diffraction study

Contact Info

Product

Resources

About

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Tl₂Ir₂O₇: A Pauli Paramagnetic Metal, Proximal to a Metal Insulator Transition

Intrinsic structural distortion and exchange interactions in SmFe_xCr_1−xO₃ compounds