Interplay among Coulomb Interaction, Spin-Orbit Interaction, and Multiple Electron-Boson Interactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>RuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

High resolution angle-resolved photoemission measurements have been carried out on Sr 2 RuO 4 .We observe clearly two sets of Fermi surface sheets near the (π,0)-(0,π) line which are most likely attributed to the surface and bulk Fermi surface splitting of the β band. This is in strong contrast to the nearly null surface and bulk Fermi surface splitting of the α band although both have identical orbital components. Extensive band structure calculations are performed by considering various scenarios, including structural distortion, spin-orbit coupling and surface ferromagnetism.

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“…1b) reveals new features that are not observed in the previous ARPES measurements [19][20][21]. for the α band ( Fig.…”

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confidence: 49%

Fermi surface sheet-dependent band splitting in Sr2RuO4revealed by high-resolution angle-resolved photoemission spectroscopy

et al. 2012

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“…Implications of spin-orbit coupling λ in 4d-transition oxide materials have already been evaluated in a number of papers [10,14,21,31,32,35,36]. The magnon band-width in Ca RuO is, for example, predicted [10] to be controlled by ∼3λ/4.…”

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confidence: 99%

Spin-orbit-induced orbital excitations inSr2RuO4andCa2RuO4: A resonant inelastic x-ray sc

et al. 2015

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High-resolution resonant inelastic x-ray scattering (RIXS) at the oxygen K edge has been used to study the orbital excitations of Ca 2 RuO 4 and Sr 2 RuO 4 . In combination with linear dichroism x-ray absorption spectroscopy, the ruthenium 4d-orbital occupation and excitations were probed through their hybridization with the oxygen p orbitals. These results are described within a minimal model, taking into account crystal field splitting and a spin-orbit coupling λ so = 200 meV. The effects of spin-orbit interaction on the electronic structure and implications for the Mott and superconducting ground states of (Ca,Sr) 2 RuO 4 are discussed.

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“…Recent LDA calculations of the electronic structure and ARPES measurements 104,161) suggest that the three cylindrical Fermi surfaces cross near the h110i plane in the absence of the SOI, while actually the crossing is removed by the SOI. According to these results, the orbital character on the Fermi surface varies with k z , with a tendency of crossing between two-dimensional and one-dimensional bands near k z ¼ 0.…”

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confidence: 99%

Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄

et al. 2012

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This review presents a summary and evaluations of the superconducting properties of the layered ruthenate Sr 2 RuO 4 as they are known in the autumn of 2011. This paper appends the main progress that has been made since the preceding review by Mackenzie and Maeno was published in 2003. Here, special focus is placed on the critical evaluation of the spin-triplet, odd-parity pairing scenario applied to Sr 2 RuO 4 . After an introduction to superconductors with possible odd-parity pairing, accumulated evidence for the pairing symmetry of Sr 2 RuO 4 is examined. Then, significant recent progress on the theoretical approaches to the superconducting pairing by Coulomb repulsion is reviewed. A section is devoted to some experimental properties of Sr 2 RuO 4 that seem to defy simple explanations in terms of currently available spin-triplet scenario. The next section deals with some new developments using eutectic boundaries and micro-crystals, which reveals novel superconducting phenomena related to chiral edge states, odd-frequency pairing states, and half-fluxoid states. Some of these properties are intimately connected with the properties as a topological superconductor. The article concludes with a summary of knowledge emerged from the study of Sr 2 RuO 4 that are now more widely applied to understand the physics of other unconventional superconductors, as well as with a brief discussion of relatively unexplored but promising areas of ongoing and future studies of Sr 2 RuO 4 .KEYWORDS: Sr 2 RuO 4 , ruthenate, spin-triplet superconductivity, topological superconductor Spin-Triplet Superconductors Candidates of spin-triplet superconductorsIn the last three decades, and particularly since the discovery of high-transition-temperature (high-T c ) superconductivity of the cuprates, 1) studies of ''unconventional'' superconductivity have been one of the main topics in condensed-matter physics. Here we designate the term ''unconventional'' as the pairing based on non-phonon mechanisms.2) The unconventional superconductivity is mainly found in heavy-fermion superconductors (since 1978), 3) Unconventional superconductivity is characterized by the anisotropic gap function or order parameter which is integrated to be zero or a small value due to the variations of the wave function ''phase'', in contrast to an ordinary s-wave state. In many of them, including high-T c cuprates and iron pnictides, the electrons are clearly paired in spinsinglet states. In this point of view, they are similar to conventional s-wave superconductors, in which the spindegrees of freedom is lost in the charged superfluids. Spintriplet superfluid states are fully established in the Fermi liquid 3 He, 7,8) for which spin and mass supercurrents emerge in the charge-neutral superfluids. The question is then whether or not spin-triplet superconductors exist, and what novel superconducting properties they may exhibit due to their charge and spin supercurrents.There are several classes of candidates of spin-triplet superconductors represented in Table I. W...

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Interplay among Coulomb Interaction, Spin-Orbit Interaction, and Multiple Electron-Boson Interactions inSr2RuO4

Cited by 50 publications

References 23 publications

Fermi surface sheet-dependent band splitting in Sr2RuO4revealed by high-resolution angle-resolved photoemission spectroscopy

Fermi surface sheet-dependent band splitting in Sr2RuO4revealed by high-resolution angle-resolved photoemission spectroscopy

Spin-orbit-induced orbital excitations inSr2RuO4andCa2RuO4: A resonant inelastic x-ray sc

Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄

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Interplay among Coulomb Interaction, Spin-Orbit Interaction, and Multiple Electron-Boson Interactions inSr2RuO4

Cited by 50 publications

References 23 publications

Fermi surface sheet-dependent band splitting in Sr2RuO4revealed by high-resolution angle-resolved photoemission spectroscopy

Fermi surface sheet-dependent band splitting in Sr2RuO4revealed by high-resolution angle-resolved photoemission spectroscopy

Spin-orbit-induced orbital excitations inSr2RuO4andCa2RuO4: A resonant inelastic x-ray sc

Evaluation of Spin-Triplet Superconductivity in Sr2RuO4

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Evaluation of Spin-Triplet Superconductivity in Sr₂RuO₄