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Malvestuto, Marco; Capogrosso, Valentina; Carleschi, Emanuela; Galli, Lorenzo; Gorelov, Evgeny; Pavarini, Eva; Fittipaldi, R.; Forte, Filomena; Cuoco, Mario; Vecchione, A.; Parmigiani, F.

doi:10.1103/physrevb.88.195143

Cited by 24 publications

(20 citation statements)

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“…Sr 2 RuO 4 has attracted a lot of attention as a possible realization of a spin-triplet superconductor [1][2][3][4] and, at the same time, as a very peculiar strongly correlated metal [5][6][7][8][9][10][11][12][13]. Understanding the details of its Fermi surface (FS) is key to unravel the nature of quasi-electrons in the normal phase and can cast light on the mechanism and the symmetry of the superconducting order parameter.…”

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confidence: 99%

Fermi Surface ofSr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects

et al. 2016

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The topology of the Fermi surface of Sr2RuO4 is well described by local-density approximation calculations with spin-orbit interaction, but the relative size of its different sheets is not. By accounting for many-body effects via dynamical mean-field theory, we show that the standard isotropic Coulomb interaction alone worsens or does not correct this discrepancy. In order to reproduce experiments, it is essential to account for the Coulomb anisotropy. The latter is small but has strong effects; it competes with the Coulomb-enhanced spin-orbit coupling and the isotropic Coulomb term in determining the Fermi surface shape. Its effects are likely sizable in other correlated multi-orbital systems. In addition, we find that the low-energy self-energy matrix -responsible for the reshaping of the Fermi surface -sizably differ from the static Hartree-Fock limit. Finally, we find a strong spin-orbital entanglement; this supports the view that the conventional description of Cooper pairs via factorized spin and orbital part might not apply to Sr2RuO4. ) electronic configuration and Ru atoms at sites with D 4h symmetry; due to the layered structure the Ru t 2g xz and yz bands are almost one-dimensional and very narrow, with a band width W xz = W yz about half as large as that of the two-dimensional Ru xy band, W xy . Experimentally, the Fermi surface of Sr 2 RuO 4 has been studied via both the de Haas-van Alphen technique [14-16] and angle-resolved photoemission spectroscopy (ARPES) [17][18][19][20]. It is made (Fig. 1) by three sheets, the electron-like γ (xy band) and β (xz, yz bands) sheets and the hole-like α sheet (xz, yz bands). Theoretically, ab-initio calculations based on the local-density approximation (LDA) qualitatively reproduce the FS topology, provided that the spin-orbit (SO) interaction is taken into account [22,23]. Indeed, several experiments point to a sizable SO coupling [1,25,26]. These calculations fail, however, in describing the relative size of the sheets, suggesting that perhaps many-body effects play a key role. The relevance of the Coulomb interaction for the electronic properties of Sr 2 RuO 4 , as well as its interplay with bands of different width, was shown early on via model many-body studies [21]. More recently, LDA+DMFT (local-density approximation + dy- namical mean-field theory) calculations have emphasized the interplay of Coulomb interaction and t 2g crystal field (CF) [9,27], and the role of the Hund's rule coupling [10]. LDA+slave-boson calculations point to SO effects on the correlated bands [28]. It remains however unclear to what extent many-body effects actually modify the Fermi surface, and how they compete with other effects. In this Letter, by using the LDA+DMFT method with SO interaction, we investigate, for the first time, the interplay between Coulomb repulsion, spin-orbit and sym-

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confidence: 99%

Fermi Surface ofSr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects

et al. 2016

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“…Current experimental evidence for a strong spinorbit interaction stems from absorption spectroscopy [17][18][19], which has revealed a considerable admixture of the ruthenium t 2g orbitals. More recently, spin-resolved photoemission spectroscopy has reported spin-polarized bands in Sr 2 RuO 4 [20,21].…”

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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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“…For example, with increasing n , the rotation angle of RuO 6 octahedron changes from zero ( n = 1) 13 , to 7° ( n = 2) 14,15 , to 11.2° ( n = 3) 16 to ~12° ( n = ∞). According to theoretical calculations 11,17,18 , such distortion impacts the electronic distribution, thus changing the physical properties.…”

Section: Introductionmentioning

confidence: 99%

Mn-induced Ferromagnetic Semiconducting Behavior with Linear Negative Magnetoresistance in Sr4(Ru1−xMnx)3O10 Single Crystals

Xing

Gui

Xie

et al. 2018

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Triple-layered Sr4Ru3O10 is a unique ferromagnet with the central RuO6 layer behaving differently from two outer layers both crystallographically and magnetically. We report that the partial substitution of Ru by smaller Mn gives rise to modification in crystal structure, electronic and magnetic properties of Sr4(Ru1−xMnx)3O10. Through the single crystal X-ray diffraction refinement, we find that (Ru/Mn)O6 octahedral rotation is no longer detectable at x ≥ 0.23, leading to the tetragonal structure. The magnetization measurements indicate the ferromagnetic transition temperature TC decreases from 105 K for x = 0 to 30 K for x = 0.41, with the reduced magnetic moment as well. Remarkably, Mn doping results in the change of magnetic anisotropy from the easy c axis in x = 0 to the easy ab plane seen in x = 0.34 and 0.41. Such change also removes the ab-plane metamagnetic transition observed in x = 0. Furthermore, the electrical resistivity increases with increasing x showing semiconducting behavior with Δ ~ 10 meV for x = 0.34 and 30 meV for x = 0.41. Under applied magnetic field, the magnetoresistance exhibits negative and linear field dependence in all current and field configurations. These results clearly indicate Sr4(Ru1−xMnx)3O10 is a novel ferromagnetic semiconductor with exotic magnetotransport properties.

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Nature of the apical and planar oxygen bonds in the Srn+1RunO3<

Cited by 24 publications

References 35 publications

Fermi Surface ofSr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects

Fermi Surface ofSr2RuO4: Spin-Orbit and Anisotropic Coulomb Interaction Effects

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

Mn-induced Ferromagnetic Semiconducting Behavior with Linear Negative Magnetoresistance in Sr4(Ru1−xMnx)3O10 Single Crystals

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