Review of Spin–Orbit Coupled Semimetal SrIrO<sub>3</sub>in Thin Film Form

Zhang, Lunyong; Pang, Bin; Chen, Y. B.; Chen, Yanfeng

doi:10.1080/10408436.2017.1358147

Cited by 31 publications

(23 citation statements)

References 77 publications

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“…3a). This agrees well with previous reports on SrIrO 3 thin films 15,23 and can be understood as a typical behavior of semimetals with extra conductivity at high temperature from thermally excited electrons and holes. With Sn doping (Fig.…”

supporting

confidence: 93%

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

et al. 2019

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Perovskite-type iridates SrIrO 3 and CaIrO 3 are a Dirac line node semimetal protected by crystalline symmetry, providing an interesting playground to investigate electron correlation effects on topological semimetals. The effect of Sn doping was examined by growing SrIr 1−x Sn x O 3 and CaIr 1−x Sn x O 3 thin films epitaxially on SrTiO 3 (001) substrate using pulsed laser deposition. Upon Sn doping, the semimetallic ground state switches into an insulator. As temperature is lowered, the resistivity, ρ(T ), of SrIr 1−x Sn x O 3 above a critical doping level (x c ∼ 0.1) shows a well-defined transition from the semimetal to a weakly ferromagnetic insulator at T = T c . In contrast, the ρ(T ) of CaIr 1−x Sn x O 3 with increasing x shows a rapid increase of magnitude but does not show clear signature of metal-insulator transition in the temperature dependence. We argue that the contrasted behavior of the two closely related iridates reflects the interplay between the effects of electron correlation and disorder enhanced by Sn doping.Recently 5d iridium oxides with perovskite-related structures have been explored extensively as a mine for exotic quantum phases, partly because of an interplay of strong spin-orbit interaction and electron correlation of the 5d electrons 1 . The strong spin-orbit coupling of ∼ 0.4 eV for 5d electrons, which is larger than the typical crystal field splitting of 0.1 eV within t 2g 2 , splits the t 2g bands with five

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confidence: 93%

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

et al. 2019

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“…One of the most tantalizing choices is the coupling between 3d and 5d electrons. The heterostructure of Mn (3d)/Ir (5d) oxides is particularly attractive because the entanglement of 3d and 5d electrons exhibit rich magnetic behaviors [4][5][6] and strong SOC [7][8][9] . For instance, emergent ferromagnetism and topological Hall effect have been reported in the SrMn 4+ O3/SrIr 4+ O3 [10][11][12] (SMO/SIO) and La0.7Sr0.3MnO3 (LSMO)/SIO 13,14 heterostructure, respectively.…”

Section: Introductionmentioning

confidence: 99%

Tailoring magnetic order via atomically stacking 3d/5d electrons to achieve high-performance spintronic devices

Huang

Wang

et al. 2020

Applied Physics Reviews

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The ability to tune magnetic orders, such as magnetic anisotropy and topological spin texture, is desired in order to achieve high-performance spintronic devices. A recent strategy has been to employ interfacial engineering techniques, such as the introduction of spin-correlated interfacial coupling, to tailor magnetic orders and achieve novel magnetic properties. We chose a unique polar-nonpolar LaMnO3/SrIrO3 superlattice because Mn (3d)/Ir (5d) oxides exhibit rich magnetic behaviors and strong spin-orbit coupling through the entanglement of their 3d and 5d electrons. Through magnetization and 3 magnetotransport measurements, we found that the magnetic order is interface-dominated as the superlattice period is decreased. We were able to then effectively modify the magnetization, tilt of the ferromagnetic easy axis, and symmetry transition of the anisotropic magnetoresistance of the LaMnO3/SrIrO3 superlattice by introducing additional Mn (3d) and Ir (5d) interfaces. Further investigations using in-depth first-principles calculations and numerical simulations revealed that these magnetic behaviors could be understood by the 3d/5d electron correlation and Rashba spin-orbit coupling.The results reported here demonstrate a new route to synchronously engineer magnetic properties through the atomic stacking of different electrons, contributing to future applications.

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“…We note that in other transition metal oxides such as SrIrO 3 [44], the atomic SOC is much stronger than that in the SrTiO 3 . However, the crystal field in such oxides is also much larger at the same time [44]. Therefore, following equation (10), the strong atomic SOC oxides does not always translate into a strong Rashba SOC.…”

Section: Linear Rashba Socmentioning

confidence: 69%

Tunable spin and orbital polarization in SrTiO₃-based heterostructures

Kong

Yang

et al. 2019

New J. Phys.

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We formulate the effective Hamiltonian of Rashba spin-orbit coupling (RSOC) in LaAlO SrTiO 3 3(LAO/STO) heterostructures. We derive analytical expressions of properties, e.g. Rashba parameter, effective mass, band edge energy and orbital occupancy, as functions of material and tunable heterostructure parameters. While linear RSOC is dominant around the Γ-point, cubic RSOC becomes significant at the higher-energy anti-crossing region. We find that linear RSOC stems from the structural inversion asymmetry (SIA), while the cubic term is induced by both SIA and bulk asymmetry. Furthermore, the SOC strength shows a striking dependence on the tunable heterostructure parameters such as STO thickness and the interfacial electric field which is ascribed to the quantum confinement effect near the LAO/STO interface. The calculated values of the linear and cubic RSOC are in agreement with previous experimental results.the SOC which accounts for the properties of the heterostructure, had been deliberately introduced, and the contribution of the bulk STO as well as the inter-orbital hopping was ignored. Significantly, the large spin splitting at the anti-crossing region, a signature of the multi-orbital effects, has not been fully elucidated.Recently, a theory based on k.p model [35, 36], including the contribution of the bulk STO, predicted a spin splitting induced by the inter-orbital hopping and interfacial band-bending. However, a complete picture of the multi-orbital Rashba SOC is still lacking. In this work, we aim to construct the effective Hamiltonian of Rashba spin-orbit coupling system in STObased structures, taking into account the underlying factors such as the confinement effect, as well as interface effects including inversion symmetry breaking (ISB) and band-bending. We derive analytical expressions of properties, e.g. Rashba parameter, effective mass, band edge energy and orbital occupancy, as functions of material and tunable heterostructure parameters. We show that the type and strength of spin-orbit coupling as well as the orbital selectivity are tunable by controlling geometric factor such as STO thickness and by applying electric field via gate voltage. The thickness and gate control of SOC provides a possible avenue for optimization of Rashba SOC for spintronics applications and devices.

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Review of Spin–Orbit Coupled Semimetal SrIrO₃in Thin Film Form

Cited by 31 publications

References 77 publications

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

Tailoring magnetic order via atomically stacking 3d/5d electrons to achieve high-performance spintronic devices

Tunable spin and orbital polarization in SrTiO₃-based heterostructures

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Review of Spin–Orbit Coupled Semimetal SrIrO3in Thin Film Form

Cited by 31 publications

References 77 publications

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3

Tailoring magnetic order via atomically stacking 3d/5d electrons to achieve high-performance spintronic devices

Tunable spin and orbital polarization in SrTiO3-based heterostructures

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Review of Spin–Orbit Coupled Semimetal SrIrO₃in Thin Film Form

Tunable spin and orbital polarization in SrTiO₃-based heterostructures