Dimensionality-Driven Metal-Insulator Transition in Spin-Orbit-Coupled 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>SrIrO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Schütz, P.; Sante, Domenico Di; Dudy, L.; Gabel, Judith; Stübinger, Martin; Kamp, M.; Huang, Yingkai; Capone, Massimo; Husanu, Marius-Adrian; Strocov, Vladimir N.; Sangiovanni, Giorgio; Sing, M.; Claessen, R.

doi:10.1103/physrevlett.119.256404

Cited by 93 publications

(71 citation statements)

References 50 publications

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“…Nevertheless, the MOKE measurements confirm the large lattice symmetry dependence (θ k = 0.15 ± 0.01 in the 25-uc SrIrO 3 sample, and 0.013 ± 0.01 in the 8-uc SrIrO 3 sample) and the anisotropic ST ratio (θ k = 0.15 ± 0.01 with j c jja axis, and 0.05 ± 0.005 with j c jjb axis in the 25-uc SrIrO 3 sample), which are qualitatively To analyze the effect of lattice symmetry on spin-Hall effect in detail, we studied the dependence of the ST ratio on varying thicknesses of SrIrO 3 films. From synchrotron X-ray measurements, we robustly established the previously discussed suppression of IrO 6 octahedral tilt for ultrathin SrIrO 3 films, which modifies the symmetry of SrIrO 3 from orthorhombic to tetragonal (see SI Appendix for details) (41)(42)(43). As shown in Fig.…”

Section: Significancesupporting

confidence: 67%

Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design

Nan

Anderson

Gibbons

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Spin-orbit coupling (SOC), the interaction between the electron spin and the orbital angular momentum, can unlock rich phenomena at interfaces, in particular interconverting spin and charge currents. Conventional heavy metals have been extensively explored due to their strong SOC of conduction electrons. However, spin-orbit effects in classes of materials such as epitaxial 5d-electron transition-metal complex oxides, which also host strong SOC, remain largely unreported. In addition to strong SOC, these complex oxides can also provide the additional tuning knob of epitaxy to control the electronic structure and the engineering of spin-to-charge conversion by crystalline symmetry. Here, we demonstrate room-temperature generation of spin-orbit torque on a ferromagnet with extremely high efficiency via the spin-Hall effect in epitaxial metastable perovskite SrIrO3. We first predict a large intrinsic spin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berry curvature in the electronic band structure. By manipulating the intricate interplay between SOC and crystalline symmetry, we control the spin-Hall torque ratio by engineering the tilt of the corner-sharing oxygen octahedra in perovskite SrIrO3 through epitaxial strain. This allows the presence of an anisotropic spin-Hall effect due to a characteristic structural anisotropy in SrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate the heteroepitaxial symmetry design approach to engineer spin-orbit effects. We therefore anticipate that these epitaxial 5d transition-metal oxide thin films can be an ideal building block for low-power spintronics.

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Section: Significancesupporting

confidence: 67%

Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design

Nan

Anderson

Gibbons

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…results in a localization of the carriers, and triggers a transition from a semimetallic to an AFM insulating state. Even for a single layer of SrIrO 3 on SrTiO 3 the nonmagnetic case is found to be metallic, and AFM ordering is required for the opening of a gap [28]. The electronic structure of the 4 u.c.…”

Section: Spin-orbit Semimetal Sriro 3 In the Two-dimensional Limitmentioning

confidence: 99%

“…Here, both electron-electron interactions and weak antilocalization contribute to the negative magnetoconductance. Structural studies have shown that octahedral coupling at the SrTiO 3 =SrIrO 3 interface suppresses the bulk octahedral rotations in the SrIrO 3 film for t < 4 u.c., enhancing magnetic interactions [28]. Within this view, the increase of χ as the film thickness is reduced can be understood as an increased fractional contribution from the less distorted magnetic interfacial region.…”

Section: Spin-orbit Semimetal Sriro 3 In the Two-dimensional Limitmentioning

confidence: 99%

“…This is in good agreement with photoemission measurements, which show the disappearance of the Fermi cutoff below 4 u.c. and the opening of a charge gap [28]. In two dimensions, the resistance value h=e 2 corresponds to the limit k F l e ∼ 1, where k F is the Fermi wave vector and l e is the mean free path, marking the transition from weak to strong localization [29].…”

Section: Spin-orbit Semimetal Sriro 3 In the Two-dimensional Limitmentioning

confidence: 99%

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Spin-Orbit Semimetal SrIrO3 in the Two-Dimensional Limit

Autieri²,

et al. 2017

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We investigate the thickness-dependent electronic structure of ultrathin SrIrO 3 and discover a transition from a semimetallic to a correlated insulating state below 4 unit cells. Low-temperature magnetoconductance measurements show that spin fluctuations in the semimetallic state are significantly enhanced while approaching the transition point. The electronic structure is further studied by scanning tunneling spectroscopy, showing that 4 unit cells SrIrO 3 is on the verge of a gap opening. Our density functional theory calculations reproduce the critical thickness of the transition and show that the opening of a gap in ultrathin SrIrO 3 is accompanied by antiferromagnetic order.

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“…1 In the case of sample S1 ( Fig.1 B top weak [19]. SIO is a correlated paramagnetic semimetal; SIO thin films do not show long-range magnetic order down to low temperatures [20,21]. Previous reports demonstrate a small magnetic moment of 0.05 B/Ir at the interface coupled antiparallel to the Mn moment [13,14].…”

Section: A2 Atomic Structure At Interfaces (Stem)mentioning

confidence: 84%

Growth-sequence-dependent interface magnetism of SrIrO3–La0.7Sr0.3MnO3 bilayers

et al. 2020

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Bilayers of the oxide 3d ferromagnet La0.7Sr0.3MnO3 (LSMO) and the 5d paramagnet SrIrO3 (SIO) with large spin-orbit coupling (SOC) have been investigated regarding the impact of interfacial SOC on magnetic order. For the growth sequence of LSMO on SIO, ferromagnetism is strongly altered and large out-of-plane-canted anisotropy associated with lacking magnetic saturation up to 4 T has been observed. Thin bilayer films have been grown coherently in both growth sequences on SrTiO3(001) by pulsed laser deposition and structurally characterized by scanning transmission electron microscopy (STEM) and x-ray diffraction (XRD).Measurements of magnetization and field-dependent Mn L2,3 edge x-ray magnetic circular dichroism (XMCD) reveal changes of LSMO magnetic order which are strong in LSMO on SIO and weak in LSMO underneath of SIO. We attribute the impact of the growth sequence to the interfacial lattice structure/symmetry which is known to influence the interfacial magnetic coupling.

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Dimensionality-Driven Metal-Insulator Transition in Spin-Orbit-Coupled SrIrO3

Cited by 93 publications

References 50 publications

Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design

Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design

Spin-Orbit Semimetal SrIrO3 in the Two-Dimensional Limit

Growth-sequence-dependent interface magnetism of SrIrO3–La0.7Sr0.3MnO3 bilayers

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Dimensionality-Driven Metal-Insulator Transition in Spin-Orbit-Coupled SrIrO3

Cited by 93 publications

References 50 publications

Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design

Anisotropic spin-orbit torque generation in epitaxial SrIrO 3 by symmetry design

Spin-Orbit Semimetal SrIrO3 in the Two-Dimensional Limit

Growth-sequence-dependent interface magnetism of SrIrO3–La0.7Sr0.3MnO3 bilayers

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Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design

Anisotropic spin-orbit torque generation in epitaxial SrIrO ₃ by symmetry design