Electron Doping of the Parent Cuprate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>without Cation Substitution

Wei, Haofei I.; Adamo, Carolina; Nowadnick, Elizabeth; Lochocki, Edward; Chatterjee, Shouvik; Ruf, Jacob; Beasley, M. R.; Schlom, D. G.; Shen, Kyle

doi:10.1103/physrevlett.117.147002

Cited by 24 publications

(24 citation statements)

References 59 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 successful synthesis of undoped T superconductors has brought this question to the fore. A number of recent experimental investigations [68][69][70] have confirmed that reduction annealing by removing apical oxygens severely reduces the stability of the AFM phase and introduces additional carriers by some mechanism that is as yet not understood. The actual carrier density even in conventional materials is different from what would be guessed from the Ce concentration alone 68,70 .…”

Section: A Experimental Puzzles: Electron-doped Materialsmentioning

confidence: 99%

Valence transition model of the pseudogap, charge order, and superconductivity in electron-doped and hole-doped copper oxides

Mazumdar

2018

Phys. Rev. B

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We present a valence transition model for electron-and hole-doped cuprates, within which there occurs a discrete jump in ionicity Cu 2+ → Cu 1+ in both families upon doping, at or near optimal doping in the conventionally prepared electron-doped compounds and at the pseudogap phase transition in the hole-doped materials. In thin films of the T compounds, the valence transition has occurred already in the undoped state. The phenomenology of the valence transition is closely related to that of the neutral-to-ionic transition in mixed-stack organic charge-transfer solids. Doped cuprates have negative charge-transfer gaps, just as rare earth nickelates and BaBiO3. The unusually high ionization energy of the closed shell Cu 1+ ion, taken together with the doping-driven reduction in three-dimensional Madelung energy and gain in two-dimensional delocalization energy in the negative charge transfer gap state drives the transition in the cuprates. The combined effects of strong correlations and small d − p electron hoppings ensure that the systems behave as effective 1 2 -filled Cu-band with the closed shell electronically inactive O 2− ions in the undoped state, and as correlated two-dimensional geometrically frustrated 1 4 -filled oxygen hole-band, now with electronically inactive closed-shell Cu 1+ ions, in the doped state. The model thus gives microscopic justification for the two-fluid models suggested by many authors. The theory gives the simplest yet most comprehensive understanding of experiments in the normal states. The robust commensurate antiferromagnetism in the conventional T crystals, the strong role of oxygen deficiency in driving superconductivity and charge carrier sign corresponding to holes at optimal doping are all manifestations of the same quantum state. In the hole-doped pseudogapped state, there occurs a biaxial commensurate period 4 charge density wave state consisting of O 1− -Cu 1+ -O 1− spin-singlets, that coexists with broken rotational C4 symmetry due to intraunit cell oxygen inequivalence. Finite domains of this broken symmetry state will exhibit two-dimensional chirality and the polar Kerr effect. Superconductivity within the model results from a destabilization of the 1 4 -filled band paired Wigner crystal [Phys. Rev. B 93, 165110 and 93, 205111]. We posit that a similar valence transition, Ir 4+ → Ir 3+ , occurs upon electron doping SrIr2O4. We make testable experimental predictions on cuprates including superoxygenated La2CuO 4+δ and iridates. Finally, as indirect evidence for the valence bond theory of superconductivity proposed here, we note that there exist an unusually large number of unconventional superconductors that exhibit superconductivity proximate to exotic charge ordered states, whose bandfillings are universally 1 4 or 3 4 , exactly where the paired Wigner crystal is most stable.

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“…Moreover, the oxygen nonstoichiometry should affect the carrier concentration and the oxygen axis is thus coupled to the doping axis. Indeed, there are recent reports on angle resolved photoemission spectroscopy (ARPES) investigations of Pr 1.3 La 0.6 Ce 0.1 CuO 4−δ single crystal and T 0 -La 2 CuO 4 thin film which reveal that annealing and oxygen vacancy induce a sufficient change in the carrier density [22,23]. These results clearly indicate that the doping should be considered in conjunction with the annealing and oxygen nonstoichiometry and that the actual electron concentration n, instead of the Ce concentration x, should be used in building the phase diagram.…”

mentioning

confidence: 99%

Electron Number-Based Phase Diagram of Pr1−xLaCexCuO4−δ
Song
¹
,
Han
²
,
Kyung
³

et al. 2017
Phys. Rev. Lett.
57
13
59
0
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We performed annealing and angle resolved photoemission spectroscopy studies on electron-doped cuprate Pr_{1-x}LaCe_{x}CuO_{4-δ} (PLCCO). It is found that the optimal annealing condition is dependent on the Ce content x. The electron number (n) is estimated from the experimentally obtained Fermi surface volume for x=0.10, 0.15 and 0.18 samples. It clearly shows a significant and annealing dependent deviation from the nominal x. In addition, we observe that the pseudo-gap at hot spots is also closely correlated with n; the pseudogap gradually closes as n increases. We established a new phase diagram of PLCCO as a function of n. Different from the x-based one, the new phase diagram shows similar antiferromagnetic and superconducting phases to those of hole doped ones. Our results raise a possibility for absence of disparity between the phase diagrams of electron- and hole-doped cuprates.

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Electron Doping of the Parent CuprateLa2CuO4without Cation Substitution

Cited by 24 publications

References 59 publications

Oxide Fermi liquid universality revealed by electron spectroscopy

Oxide Fermi liquid universality revealed by electron spectroscopy

Valence transition model of the pseudogap, charge order, and superconductivity in electron-doped and hole-doped copper oxides

Electron Number-Based Phase Diagram of Pr1−xLaCexCuO4−δ
Song
¹
,
Han
²
,
Kyung
³

et al. 2017
Phys. Rev. Lett.
57
13
59
0
View full text Add to dashboard Cite

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Electron Doping of the Parent CuprateLa2CuO4without Cation Substitution

Cited by 24 publications

References 59 publications

Oxide Fermi liquid universality revealed by electron spectroscopy

Oxide Fermi liquid universality revealed by electron spectroscopy

Valence transition model of the pseudogap, charge order, and superconductivity in electron-doped and hole-doped copper oxides

Electron Number-Based Phase Diagram of Pr1−xLaCexCuO4−δSong1, Han2, Kyung3 et al. 2017Phys. Rev. Lett.5713590View full textAdd to dashboardCite

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About

Electron Number-Based Phase Diagram of Pr1−xLaCexCuO4−δ
Song
¹
,
Han
²
,
Kyung
³

et al. 2017
Phys. Rev. Lett.
57
13
59
0
View full text Add to dashboard Cite