Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Pr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
 driven by oxygen nonstoichiometry

Horio, M.; Krockenberger, Yoshiharu; Koshiishi, K.; Nakata, S.; Hagiwara, K.; Kobayashi, Masaki; Horiba, Koji; Kumigashira, Hiroshi; Irie, Hiroshi; Yamamoto, Hideki; Fujimori, A.

doi:10.1103/physrevb.98.020505

Cited by 22 publications

(13 citation statements)

References 42 publications

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“…1(a)]-corresponds to a filling of 15% electron doping. While there have been extensive reports on additional electron doping by reduction annealing of electron-doped cuprates [20,[29][30][31][32][33], this filling is consistent with the nominal Ce concentration.…”

Section: Resultssupporting

confidence: 70%

Oxide Fermi liquid universality revealed by electron spectroscopy

Horio¹,

Kramer²,

Wang³

et al. 2020

Phys. Rev. B

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We present a combined soft x-ray and high-resolution vacuum-ultraviolet angle-resolved photoemission spectroscopy study of the electron-overdoped cuprate Pr 1.3−x La 0.7 Ce x CuO 4 (PLCCO). Demonstration of its highly two-dimensional band structure enabled precise determination of the in-plane self-energy dominated by electron-electron scattering. Through analysis of this self-energy and the Fermi liquid cut-off energy scale, we find-in contrast to hole-doped cuprates-a momentum isotropic and comparatively weak electron correlation in PLCCO. Yet, the self-energies extracted from multiple oxide systems combine to demonstrate a logarithmic divergent relation between the quasiparticle scattering rate and mass. This constitutes a spectroscopic version of the Kadowaki-Woods relation with an important merit-the demonstration of Fermi liquid quasiparticle lifetime and mass being set by a single energy scale.

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Section: Resultssupporting

confidence: 70%

Oxide Fermi liquid universality revealed by electron spectroscopy

Horio¹,

Kramer²,

Wang³

et al. 2020

Phys. Rev. B

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“…The oxygen con- centration in the reduced sample is likely smaller than 4.0 to preserve charge neutrality, namely, the CuO 2 planes and/or Nd-O layers are likely oxygen deficient, as indicated in a structural study [4]. Electron doping of the T ′ -structured compounds without Ce substitution has been reported for thin films [53][54][55] and polycrystalline samples [56][57][58]. Our result constitutes spectroscopic evidence of this effect in a Ce-free single crystal, even though the implied density of doped electrons is relatively small.…”

Section: Discussionmentioning

confidence: 93%

Post-growth annealing effects on charge and spin excitations in Nd$_{2-x}$Ce$_x$CuO$_4$

Ishii,

Asano,

Ashida

et al. 2020

Preprint

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We report a Cu K-and L3-edge resonant inelastic x-ray scattering study of charge and spin excitations of bulk Nd2−xCexCuO4, with focus on post-growth annealing effects. For the parent compound Nd2CuO4 (x = 0), a clear charge-transfer gap is observed in the as-grown state, whereas the charge excitation spectra indicate that electrons are doped in the annealed state. This is consistent with the observation that annealed thin-film and polycrystalline samples of RE2CuO4 (RE = rare earth) can become metallic and superconducting at sufficiently high electron concentrations without Ce doping. For x = 0.16, a Ce concentration for which it is known that oxygen reduction destroys long-range antiferromagnetic order and induces superconductivity, we find that the highenergy spin excitations of non-superconducting as-grown and superconducting annealed crystals are nearly identical. This finding is in stark contrast to the significant changes in the low-energy spin excitations previously observed via neutron scattering.

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“…Inspired by these studies, hard x-ray photoemission spectroscopy (HAXPES) measurements have been performed on the SC Nd 2 CuO 4 thin films to detect electron doping through the measurements of the chemical-potential shift deduced from the core-level spectra 8 . The results, together with subsequent angle-resolved photoemission spectroscopy measurements on SC Pr 2 CuO 4 thin films to probe the Fermi surface area 9 , have unveiled that electrons are actually doped in Ce-undoped T ′ -type cuprates after reduction annealing. On top of the superconductivity without Ce doping, LESCO (x > 0) is the first nominally hole-doped SC cuprate with the T ′ -type structure 4,10 .…”

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confidence: 86%

Nature of Carrier Doping in T′-La_1.8−_xEu_0.2Sr_xCuO₄ Studied by X-Ray Photoemission and Absorption Spectroscopy

et al. 2019

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Recently, hole-doped superconducting cuprates with the T ′ -structure La1.8-xEu0.2SrxCuO4 (LE-SCO) have attracted a lot of attention. We have performed x-ray photoemission and absorption spectroscopy measurements on as-grown and reduced T ′ -LESCO. Results show that electrons and holes were doped by reduction annealing and Sr substitution, respectively. However, it is shown that the system remains on the electron-doped side of the Mott insulator or that the charge-transfer gap is collapsed in the parent compound.

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Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr2CuO4 driven by oxygen nonstoichiometry

Cited by 22 publications

References 42 publications

Oxide Fermi liquid universality revealed by electron spectroscopy

Oxide Fermi liquid universality revealed by electron spectroscopy

Post-growth annealing effects on charge and spin excitations in Nd$_{2-x}$Ce$_x$CuO$_4$

Nature of Carrier Doping in T′-La_1.8−_xEu_0.2Sr_xCuO₄ Studied by X-Ray Photoemission and Absorption Spectroscopy

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Angle-resolved photoemission spectroscopy of the low-energy electronic structure of superconducting Pr2CuO4 driven by oxygen nonstoichiometry

Cited by 22 publications

References 42 publications

Oxide Fermi liquid universality revealed by electron spectroscopy

Oxide Fermi liquid universality revealed by electron spectroscopy

Post-growth annealing effects on charge and spin excitations in Nd$_{2-x}$Ce$_x$CuO$_4$

Nature of Carrier Doping in T′-La1.8−xEu0.2SrxCuO4 Studied by X-Ray Photoemission and Absorption Spectroscopy

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Nature of Carrier Doping in T′-La_1.8−_xEu_0.2Sr_xCuO₄ Studied by X-Ray Photoemission and Absorption Spectroscopy