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Yang, Jianbo; Terakura, C.; Medarde, M.; White, J. S.; Sheptyakov, Denis; Yan, Xiaozhi; Li, N.-N.; Yang, Wenge; Xia, Hailiang; Dai, Jianxing; Yin, Yanfeng; Jiao, Yang; Cheng, Jinguang; Bu, Yali; Zhang, Qinfang; Li, X.-D.; Chen, Jin; Taguchi, Y.; Tokura, Y.; Long, Youwen

doi:10.1103/physrevb.92.195147

Cited by 22 publications

(6 citation statements)

References 38 publications

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“…As shown in Figure e, the pressure dependence of cell volume for the three structural phases at RT can be well fitted by the isothermal Birch–Murnaghan equation of state with the function P ( V ) = 1.5 B 0 [( V 0 / V ) 7/3 – ( V 0 / V ) 5/3 ] × {1 + 0.75( B 0 ′ – 4)[( V 0 / V ) 2/3 – 1]}, where the B 0 and B 0 ′ are the bulk modulus and its pressure derivative, respectively. , In the case of B 0 ′ = 4, which is a typical value for elastic lattices, the fitting gives B 0 = 164(3) GPa for the cubic Pn 3̅ phase, 187(8) GPa for the Tetra.-I phase, and 203(3) GPa for the Tetra.-II phase. The value of B 0 in the cubic phase of PbCoO 3 is similar to that observed in the simple cubic perovskite SrCoO 3 …”

Section: Resultsmentioning

confidence: 99%

“…The value of B 0 in the cubic phase of PbCoO 3 is similar to that observed in the simple cubic perovskite SrCoO 3 . 67 As seen from the temperature dependent electrical measurements at different pressures (Figure 2), the high-pressure Tetra.-I phase is metallic whereas the Tetra.-II phase is insulating. Moreover, for the Tetra.-I phase occurring between about 20 and 30 GPa, lowering temperature triggers a metalto-insulator transition.…”

Section: Resultsmentioning

confidence: 99%

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Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

et al. 2020

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Spin state transition and intermetallic charge transfer can essentially change material structural and physical properties with a fashion of excluding external chemical doping. However, these two effects have rarely been found to occur sequentially in a specific material. In this article, we show the realization of these two phenomena in a perovskite oxide PbCoO3 with a simple ABO3 composition under high pressure. PbCoO3 possesses a peculiar A-and B-site ordered charge distribution Pb 2+ Pb 4+ 3Co 2+ 2Co 3+ 2O12 with insulating behavior at ambient conditions. The high spin Co 2+ gradually changes to low spin with increasing pressure up to about 15 GPa, leading to the anomalous increase of resistance magnitude. Between 15 GPa and 30 GPa, the intermetallic charge transfer occurs between Pb 4+ and Co 2+ cations. The accumulated charge-transfer effect triggers a metal-insulator transition as well as a first-order structural phase transition toward a Tetra.-I phase at the onset of ~20 GPa near room temperature. On further compression over 30 GPa, the charge transfer completes, giving rise to another first-order structural transformation toward a Tetra.-II phase and the reentrant electrical insulating behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

et al. 2020

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“…In typical 3D ferromagnets such as Fe, Ni [7], Fe 3 O 4 [8], the magnetic anisotropy energy (MAE) change under 1 GPa hydrostatic pressure is only about a few percent, too small to cause any spin reorientation transition. In SrCoO 3 , a Co-based perovskite, a spin reorientation change under 1.1 GPa pressure was suggested by density functional theory calculations [9]. Recent calculations [10] also predict giant pressure induced changes in the MAE of a layered ferromagnet, Fe 3 GeTe 2 .…”

Section: Introductionmentioning

confidence: 98%

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Lin

Lohmann

Ali

et al. 2018

Phys. Rev. Materials

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Anisotropic magnetoresistance (AMR) of Cr 2 Ge 2 Te 6 (CGT), a layered ferromagnetic insulator, is investigated under an applied hydrostatic pressure up to 2 GPa. The easy axis direction of the magnetization is inferred from the AMR saturation feature in the presence and absence of the applied pressure. At zero applied pressure, the easy axis is along the cdirection or perpendicular to the layer. Upon application of a hydrostatic pressure>1 GPa, the uniaxial anisotropy switches to easy-plane anisotropy which drives the equilibrium magnetization from the c-axis to the ab-plane at zero magnetic field, which amounts to a giant magnetic anisotropy energy change (>100%). As the temperature is increased across the Curie temperature, the characteristic AMR effect gradually decreases and disappears. Our first-principles calculations confirm the giant magnetic anisotropy energy change with moderate pressure and assign its origin to the increased off-site spin-orbit interaction of Te atoms due to a shorter Cr-Te distance. Such a pressure-induced spin reorientation transition is very rare in three-dimensional ferromagnets, but it may be common to other layered ferromagnets with similar crystal structures to CGT, and therefore offers a unique way to control magnetic anisotropy.

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“…Members of other double-perovskite families, for instance, those of V-based perovskites, AA′ 3 V 4 O 12 , also find various applications in industry, but they are less systematically studied to date. − Meanwhile, the vanadate perovskites could also uncover a number of unique features of perovskite materials, thereby contributing to a deeper understanding of interrelations between their crystal chemistry and properties. Recent advances in investigations of some other vanadium compounds hint that V-based perovskites may reveal rather spectacular features, − especially, if they are additionally subjected to extreme conditions, such as high pressures. − …”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Transitions in CaCo₃V₄O₁₂ Perovskite at Extreme Conditions

et al. 2017

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We investigated the structural, vibrational, magnetic, and electronic properties of the recently synthesized CaCoVO double perovskite with the high-spin (HS) Co ions in a square-planar oxygen coordination at extreme conditions of high pressures and low temperatures. The single-crystal X-ray diffraction and Raman spectroscopy studies up to 60 GPa showed a conservation of its cubic crystal structure but indicated a crossover near 30 GPa. Above 30 GPa, we observed both an abnormally high "compressibility" of the Co-O bonds in the square-planar oxygen coordination and a huge anisotropic displacement of HS-Co ions in the direction perpendicular to the oxygen planes. Although this effect is reminiscent of a continuous HS → LS transformation of the Co ions, it did not result in the anticipated shrinkage of the cell volume because of a certain "stiffing" of the bonds of the Ca and V cations. We verified that the oxidation states of all the cations did not change across this crossover, and hence, no charge-transfer effects were involved. Consequently, we proposed that CaCoVO could undergo a phase transition at which the large HS-Co ions were pushed out of the oxygen planes because of lattice compression. The antiferromagnetic transition in CaCoVO at 100 K was investigated by neutron powder diffraction at ambient pressure. We established that the magnetic moments of the Co ions were aligned along one of the cubic axes, and the magnetic structure had a 2-fold periodicity along this axis, compared to the crystallographic one.

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Pressure-induced spin reorientation and spin state transition inSrCoO3

Cited by 22 publications

References 38 publications

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Structural and Magnetic Transitions in CaCo₃V₄O₁₂ Perovskite at Extreme Conditions

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Pressure-induced spin reorientation and spin state transition inSrCoO3

Cited by 22 publications

References 38 publications

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO3

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO3

Pressure-induced spin reorientation transition in layered ferromagnetic insulator Cr2Ge2Te6

Structural and Magnetic Transitions in CaCo3V4O12 Perovskite at Extreme Conditions

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Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO₃

Structural and Magnetic Transitions in CaCo₃V₄O₁₂ Perovskite at Extreme Conditions