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Itti, R.; Munakata, Fumio; Ikeda, K.; Yamauchi, H.; Koshizuka, N.; Tanaka, Shōji

doi:10.1103/physrevb.43.6249

Cited by 42 publications

(14 citation statements)

References 11 publications

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“…Prior to the study of van Veenendaal et al, at least two other groups have studied the Bi 2 Sr 2 Ca 1−x Y x Cu 2 O 8+δ system with photoelectron spectroscopy. Itti et al [15] measured all core level positions over the whole doping range and essentially found the same results as van Veenendaal et al [16]. However, they do not consider the possibility of changes in chemical potential and instead try to explain their data fully in terms of chemical shifts.…”

Section: Introductionmentioning

confidence: 66%

“…Concerning the influence of contamination, it is illustrative to note that van Veenendaal et al, who claim to have very clean surfaces [13], also find almost the same shifts in the photoelectron spectra of Bi 2 Sr 2 Ca 1−x Y x Cu 2 O 8+δ as Itti et al, whose surfaces clearly suffer from a non-negligible amount of contamination [15,60].…”

Section: Doping Dependence Of the Chemical Potentialmentioning

confidence: 72%

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Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Rietveld

Glastra

Marel

1995

Physica C: Superconductivity

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cA systematic study is performed of the doping dependence of the chemical potential µ in La2−xSrxCuO4 as a function of Sr content, using a well-characterized series of pellets and thin films. The measured shift of the chemical potential, as deduced from the changes in the photoelectron spectra, is compared with present models for the doping behaviour of µ in high-Tc materials. The results obtained can be best described assuming µ shifts due to the doping of a rigid narrow band.

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Section: Introductionmentioning

confidence: 66%

Section: Doping Dependence Of the Chemical Potentialmentioning

confidence: 72%

Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Rietveld

Glastra

Marel

1995

Physica C: Superconductivity

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“…A similar shift to high binding energy with increasing Cu valence is seen for YBaECU307 _ 8; here the formal copper valency is controlled by changing the oxygen content of the material (Gourieux et al, 1988;Flavell & Egdell, 1989;Dauth, Kachel, Rupp & Gudat, 1988;Herzog, Schwarz, Sixl & Hoppe, 1988;Steiner et al, 1987). However, a decrease in binding energy with increasing Cu valence is observed in Bi2SrECal-xYxCu208 + ~ by van Veenendaal et al and Itti et al (although the latter authors use a bondvalence-sum calculation to arrive at the conclusion that the reverse behaviour is expected) (van Veenendaal et al, 1993(van Veenendaal et al, , 1994Itti et al, 1991). This discrepancy may arise in part from differences in procedures for charge referencing the spectra between different groups [as the samples with high Y contents (lower Cu valency) are not metallic].…”

Section: Bi2sr2cal-xyxcu2oe÷6mentioning

confidence: 89%

“…There is general agreement that the valenceband edge moves towards the Fermi energy on hole doping, i.e. as the formal valency of Cu increases (x --, 0) ( van Veenendaal et al, 1993van Veenendaal et al, , 1994Itti et al, 1991;Mante et al, 1992;Golden et al, 1991). However, shifts in the 2p peak energies appear somewhat controversial.…”

Section: Bi2sr2cal-xyxcu2oe÷6mentioning

confidence: 98%

“…This transition has been studied in a number of photoemission measurements, which show the disappearance of the DOS at the Fermi level as the transition is approached, with a corresponding shift in valence-band and core-level peaks (e.g. van Veenendaal, Sawatzky & Groen, 1994;van Veenendaal, Schlatmann, Sawatzky & Groen, 1993;Itti et al, 1991;Golden, Golden, Egdell & Flavell, 1991). The valence modulation caused by the addition of Y is accompanied by structural modifications, primarily contraction along the c axis of the structure, and expansion in the ab plane, which contains the Cu-O2 planes, with corresponding changes in Cu-O hybridization (Manthiram & Goodenough, 1988;Tamegai et al, 1989;Groen et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Resonant Photoemission from Complex Cuprates and Nickelates

Flavell¹,

Hollingworth²,

Howlett³

et al. 1995

J Synchrotron Radiat

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Synchrotron-excited resonant-photoemission measurements at rare-earth 4d ~ 4fand transition-metal 3p ~ 3d thresholds have been carried out using a variety of complex cuprates and nickelates on stations 6.1 (grazing-incidence monochromator) and 6.2 (toroidal-grating monochromator) at the SRS CLRC Daresbury Laboratory. The systems studied are Nd2Nil _xCuxO4, La2_xSrxNil _yFeyO4 + 6 and Bi2Sr/Cal_xYxCu208 + 6. A combination of EDC and constant-initial-state data is used to examine the 4f and 3d contributions to the valence-band density of states and their binding-energy positions relative to the Fermi energy. This allows the study of the valence states of the transitionmetal ions and their modulation on doping. For La2_ xSrxNii _ yFeyO4 + 6, this approach is used to infer a valence state of _> 3.0 for Fe. In the case of Bi2Sr2Cal _ xYxCuz08 + 6, the effect of Cu valence modulation on the 3p resonance is observed as x is varied. This is discussed in the light of controversy surrounding shifts in core-level photoemission with doping for this system.

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Comparative Study of the Polarized XANES at the Cu K Edge of Bi₂Sr₂Ca₁Cu₂O₈, Bi₂Sr₂Ca₂Cu₃O₁₀, and Y₁Ba₂Cu₃O₇ Thin Films

Poumellec

Cortès²,

Labdi

et al. 1992

Physica Status Solidi (b)

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The angular dependence of the Cu K edge in films of BiSrCaCuO (2212, 2223) and YBa2Cu3O7 are measured for both orientations (e ⟂ c, e ∥ c). A similar XANES is observed (but magnitudes and energy positions change slightly) although the compounds are quite different except the first shell. Specifically, anisotropy spectra are very close. After connecting the same XANES features to the local arrangement, it is found that the pyramidal site in 2223 is flattened compared to the one in 2212 by only (0.003 ± 0.001) nm. In addition, it is deduced that the electron density in the copper sphere is similar in all compounds whatever the site (CuII). Then, taken into consideration that pyramidal sites in 2212 and in YBaCuO are rather close to each other, an estimate is deduced of the absorption edge arising from the chain site following the two polarization directions. The major resonance on these spectra yields 0.009 nm of distance anisotropy, a result in very good agreement with the XRD data. In the course of the discussion, it is explained why the anisotropy spectrum is smaller in YBaCuO than in 2212. Lastly, the difference spectrum published by Tranquada et al. on oxygen reduction of YBa2Cu3Ox is revisited. It is deduced that the electron density increases in the copper sphere as soon as x = 7 when the copper atoms in the chains change from four to three oxygen coordination. Then, when the local structure evolves from three to two oxygen coordination, the local valence on the copper sphere does not change anymore but on the bridging oxygen.

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Shift of x-ray-photoelectron core levels inBi2Sr2

Cited by 42 publications

References 11 publications

Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Resonant Photoemission from Complex Cuprates and Nickelates

Comparative Study of the Polarized XANES at the Cu K Edge of Bi₂Sr₂Ca₁Cu₂O₈, Bi₂Sr₂Ca₂Cu₃O₁₀, and Y₁Ba₂Cu₃O₇ Thin Films

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Shift of x-ray-photoelectron core levels inBi2Sr2

Cited by 42 publications

References 11 publications

Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Doping dependence of the chemical potential in cuprate high-Tc superconductors I. La2−xSrxCuO4

Resonant Photoemission from Complex Cuprates and Nickelates

Comparative Study of the Polarized XANES at the Cu K Edge of Bi2Sr2Ca1Cu2O8, Bi2Sr2Ca2Cu3O10, and Y1Ba2Cu3O7 Thin Films

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Comparative Study of the Polarized XANES at the Cu K Edge of Bi₂Sr₂Ca₁Cu₂O₈, Bi₂Sr₂Ca₂Cu₃O₁₀, and Y₁Ba₂Cu₃O₇ Thin Films