Sequence and symmetry of hole injection in YBa2Cu3O6+x in situ and ex situ experiments on powders and single crystals using X-ray absorption spectroscopy

Tolentino, H.; Baudelet, F.; Fontaine, A.; Gourieux, T.; Krill, G.; Henry, J.Y.; Rossat‐Mignod, J.

doi:10.1016/0921-4534(92)90751-w

Cited by 60 publications

(63 citation statements)

References 59 publications

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“…The experiments [21,22] were very important for understanding of the charge transfer mechanism in YBCO. Because only those copper site which are surrounded by oxygen vacancies give a contribution into the monovalent copper amount, their concentration coincides with x 0 .…”

Section: A Concentration Of Holes Quitting the Chainsmentioning

confidence: 99%

“…Generalization is based on the result obtained in the soft X-ray absorption spectroscopy investigation of untwinned YBa 2 Cu 3 O 7 and reported in [19]: The concentration of oxygen holes in the Cu-O chains has been estimated around 30%. This experimental estimate is essential for applying the charge transfer mechanism discussed theoretically in [20] and partly based on the experimental investigations [21,22] of the monovalent Cu amount in YBa 2 Cu 3 O 6+x . A short resumé of the mechanism proposed in [20] is as follows: Existence of the CF, involving n+1 Cu 2+ and n O atoms, m of which are O 2− and n−m atoms are O − , is consistent with m−1 holes transferred from the fragment.…”

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confidence: 99%

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Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

Uimin

1994

Phys. Rev. B

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In connection with numerous X-ray and neutron investigations of some high temperature superconductors (YBa 2 Cu 3 O 6+x and related compounds) a nontrivial part of the structure factor, coming from partly disordered Cu-O-. . .-O-Cu chain fragments, situated within basal planes, CuO x , can be a subject of theoretical interest. Closely connected to such a diffusive part of the structure factor are the correlation lengths, which are also available in neutron and Xray diffraction studies and depend on a degree of oxygen disorder in a basal plane. The quantitative measure of such a disorder can be associated with temperature of a sample anneal, T q , at which oxygen in a basal plane remains frozen-in high temperature equilibrium after a fast quench of a sample to room or lower temperature. The structure factor evolution with x is vizualized in figures after the numerical calculations. The theoretical approach employed in the paper has been developed for the orthorhombic state of YBCO. 74.70.Vy, 64.60.Cn, 64.80.Eb

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Section: A Concentration Of Holes Quitting the Chainsmentioning

confidence: 99%

mentioning

confidence: 99%

Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

Uimin

1994

Phys. Rev. B

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“…In each pair, the peaks at lower energy (B and D) and those at higher energy (C and E) correspond to well-screened and poorly-screened corehole final states, respectively [8]. On the other hand, the assignment of the features in the YBa 2 Cu 3 O 6 spectra is rather complicated [9] because there are two distinct Cu sites. One type of Cu atoms is in the monovalent Cu(1) site, which forms the one-dimensional chains in YBa 2 Cu 3 O 7 .…”

Section: Methodsmentioning

confidence: 99%

“…The polarization of the incident x-rays ( ǫ i ) contains nearly equal out-of-plane ( ǫ i c) and in-plane ( ǫ i ⊥ c) components. Prominent peaks in the absorption spectra are labeled by the same letters A-N as in the reports [8,9]. In Nd 2 CuO 4 , the peaks B and C in the ǫ c spectrum are assigned to the 1s-4p π transitions.…”

Section: Methodsmentioning

confidence: 99%

Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic X-ray scattering

Ishii

Hoesch

Inami

et al. 2008

Journal of Physics and Chemistry of Solids

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We report a Cu K-edge resonant inelastic x-ray scattering (RIXS) study of high-Tc cuprates. Momentum-resolved charge excitations in the CuO2 plane are examined from parent Mott insulators to carrier-doped superconductors. The Mott gap excitation in undoped insulators is found to commonly show a larger dispersion along the [π, π] direction than the [π, 0] direction. On the other hand, the resonance condition displays material dependence. Upon hole doping, the dispersion of the Mott gap excitation becomes weaker and an intraband excitation appears as a continuum intensity below the gap at the same time. In the case of electron doping, the Mott gap excitation is prominent at the zone center and a dispersive intraband excitation is observed at finite momentum transfer.

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“…This is not an unrealistic premise as far as the HTSC are concerned, since it has been experimentally established that doping does not occur exclusively in the CuO 2 planes but involves also the dielectric layers between them. This is born out by XPS studies which permit to determine the relative change with doping of the population of Cu + versus Cu ++ ions [45]. Further indications that doping occurs in a multi-component system comes from measurements of the size of the Fermi surface volume [46] which show that the universal curve for T c as a function of doping is shifted downwards in doping as compared to its dependence on the chemical doping rate.…”

Section: The Doping and Temperature Dependence Of The Pseudo-gapmentioning

confidence: 99%

From phase- to amplitude-fluctuation-driven superconductivity in systems with precursor pairing

Ranninger

Tripodi

2003

Phys. Rev. B

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The change-over from phase-to amplitude-fluctuation driven superconductivity is examined for a composite system of free electrons (Fermions with concentration nF ) and localized electron-pairs (hard-core Bosons with concentration nB) as a function of doping -changing the total concentration of charge carriers (ntot = nF + 2nB). The coupling together of these two subsystems via a charge exchange term induces electron pairing and ultimately superconductivity in the Fermionic subsystem. The difference in statistics of the two species of charge carriers has important consequences on the doping mechanism, showing an onset temperature T * of incoherent electron pairing in the Fermionic subsystem (manifest in form of a pseudogap), which steadily decreases with decreasing ntot. Below T * this electron pairing leads, in the normal phase, to electron-pair resonant states (Cooperons) with quasi-particle features which strongly depend on ntot. For high concentrations, where nB ≃ 0.5, correlation effects between the hard-core Bosons lead to itinerant Cooperons having a heavy mass mp, but are long-lived. Upon reducing the concentration of charge carriers and consequently nB, the mass as well as the lifetime of those Cooperons is considerably reduced. As a result, for high values of nB, a superconducting state below T * sets in at a Tc, being controlled by the phase stiffness D φ =h 2 np/mp of those Cooperons, where np denotes their density. Upon reducing ntot, the phase stiffness steadily increases, and eventually exceeds the pairing energy kBT * . There, the Cooperons loose their well defined itinerant quasi-particle features and superconductivity gets controlled by amplitude fluctuations. The resulting phase diagram with doping is reminiscent of that of the phase fluctuation scenario for high Tc superconductivity, except that in our scenario the determinant factors are the mass and the lifetime of the Cooperons rather than their density.PACS numbers: 74.20.Mn

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Sequence and symmetry of hole injection in YBa2Cu3O6+x in situ and ex situ experiments on powders and single crystals using X-ray absorption spectroscopy

Cited by 60 publications

References 59 publications

Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes ofYBa2Cu3<

Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic X-ray scattering

From phase- to amplitude-fluctuation-driven superconductivity in systems with precursor pairing

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