<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Rh</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>x</mml:mi><mml:mspace width="0.28em" /><mml:mo>&lt;</mml:mo><mml:mspace width="0.28em" /><mml:mn>0.

Saito, Chikara; Haskel, D.; Sim, Jae-Hoon; Kim, Heung Sik; Chen, Cheng-Chien; Fabbris, G.; Veiga, L. S. I.; Souza-Neto, N. M.; Terzic, Jasminka; Butrouna, K.; Cao, Gang; Han, Myung Joon; Veenendaal, M. van

doi:10.1103/physrevb.92.081114

Cited by 26 publications

(31 citation statements)

References 18 publications

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“…The experimental branching ratio changes by only 10−12% in going from Ir 4+ to Ir 5+ . 39 Since only less than 25% of Ir ions are in a 5+ valence state at any x value we expect the branching ratio to be rather insensitive to Rh content in agreement with previous reports 28 . The charge transfer from Ir 5d to Rh 4d orbitals via intervening oxygen atoms is consistent with density functional calculations showing that Rh occupied states in the vicinity of the Fermi level (lower Hubbard band) lie lower in energy than Ir 5d occupied states at low Rh doping levels.…”

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confidence: 90%

“…22 However, a recent report shows no perturbation of the expectation value L · S in the Ir 5d band with increasing x, appearing to invalidate this conclusion. 28 The same report shows formation of impurity Rh bands overlapping with the lower Hubbard band (LHB) in Sr 2 IrO 4 as a likely cause for the insulator-metal transition 28 . Angle-resolved photoemission (ARPES) measurements at low Rh doping show rigid band shift with no appreciable change in band dispersion, the chemical potential moving into the LHB consistent with hole doping of J eff =1/2 states 14 .…”

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confidence: 95%

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Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

et al. 2017

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The simultaneous presence of sizable spin-orbit interactions and electron correlations in iridium oxides has led to predictions of novel ground states including Dirac semimetals, Kitaev spin liquids, and superconductivity. Electron and hole doping studies of spin-orbit assisted Mott insulator Sr2IrO4 are being intensively pursued due to extensive parallels with the La2CuO4 parent compound of cuprate superconductors. In particular, the mechanism of charge doping associated with replacement of Ir with Rh ions remains controversial with profound consequences for the interpretation of electronic structure and transport data. Using x-ray absorption near edge structure (XANES) measurements at the Rh L, K-and Ir L-edges we observe anomalous evolution of charge partitioning between Rh and Ir with Rh doping. The partitioning of charge between Rh and Ir sites progresses in a way that holes are initially doped into the J eff =1/2 band at low x only to be removed from it at higher x values. This anomalous hole doping naturally explains the reentrant insulating phase in the phase diagram of Sr2Ir1−xRhxO4 and ought to be considered when searching for superconductivity and other emergent phenomena in iridates doped with 4d elements.

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Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

et al. 2017

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“…There are several additional effects that can further reduce the branching ratio as a function of pressure. A stronger change is expected from increased delocalization that causes a mixing of the different j eff levels leading to a reduction of the effective spin-orbit coupling 77 . Additionally, the smaller effective spin-orbit coupling strength combined with a larger cubic field can decrease the mixing of the e with the t 2 orbitals, thereby lowering its contribution to L • S .…”

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Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites

et al. 2018

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We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A2FeReO6 (A=Ca, Ba) using Re L2,3 edge x-ray absorption spectroscopy and powder diffraction measurements. Volume compression is shown to dramatically increase the magnetic coercivity (Hc) in polycrystalline samples of both compounds with ∆Hc/∆V ∼ 150-200 Oe/Å 3. A nearly eight-fold increase in Hc, from 0.2 T to 1.55 T, is obtained in Ba2FeReO6 at P=29 GPa. While no signs of structural phase transitions are seen in either sample to ∼ 30 GPa, the structural data points to a pressure-driven increase in tetragonal distortion of ReO6 octahedra. A sizable but pressure-independent Re orbital-to-spin magnetic moment ratio is observed, pointing to the critical role of spin-orbit interactions at Re sites. We present a j eff description of the electronic structure that combines effects of crystal field and spin-orbit coupling on the Re 5d 2 orbitals and use this description to provide insight into the pressure-induced enhancement of magnetic anisotropy.

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“…Much recent progress has been made in understanding the nature of the spin-orbit Mott state in the layered perovskite iridates 2,3,6,[12][13][14][16][17][18]24,[27][28][29]32,36 , in which spin-orbit coupling and Coulomb electron-electron correlations combine to form an insulating state. The spinorbit coupling arranges the t 2g bands by an effective angular momentum into a filled J eff = 3 2 state and a half-filled J eff = 1 2 state.…”

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Doping-dependent correlation effects in (Sr1−xLax)3Ir2O7
Affeldt
¹
,
Hogan
²
,
Denlinger
³

et al. 2018
Phys. Rev. B
3
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2
2
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We have measured the signatures of electronic energy scales and their doping evolution in the band structure of (Sr 1−x La x) 3 Ir 2 O 7 using angle-resolved photoemission spectroscopy (ARPES). While band splittings and positions corresponding to the bilayer splitting and spin-orbit coupling undergo only small changes, the Mott gap and effective mass of both the lower Hubbard band and conduction band exhibit strong variations with doping. These changes correspond to similar observations in the cuprate superconductors, and are likely connected to the changing effective Coulomb interaction upon addition of itinerant carriers.

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Sr2Ir1−xRhxO4(x<0.

Cited by 26 publications

References 18 publications

Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites

Doping-dependent correlation effects in (Sr1−xLax)3Ir2O7
Affeldt
¹
,
Hogan
²
,
Denlinger
³

et al. 2018
Phys. Rev. B
3
0
2
2
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Sr2Ir1−xRhxO4(x<0.

Cited by 26 publications

References 18 publications

Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites

Doping-dependent correlation effects in (Sr1−xLax)3Ir2O7Affeldt1, Hogan2, Denlinger3 et al. 2018Phys. Rev. B3022View full textAdd to dashboardCite

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Doping-dependent correlation effects in (Sr1−xLax)3Ir2O7
Affeldt
¹
,
Hogan
²
,
Denlinger
³

et al. 2018
Phys. Rev. B
3
0
2
2
View full text Add to dashboard Cite