Photoemission study of the metal to insulator transition of Bi2Sr2Ca1−xYxCu2O8+δ

Mante, G.; Schmalz, Th.; Manzke, R.; Skibowski, M.; Alexander, M.; Fink, J.

doi:10.1016/0039-6028(92)91395-r

Cited by 16 publications

(13 citation statements)

References 27 publications

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“…This can also be seen as a decrease in full width at half maximum (FWHM). The correlation between the XAS prepeak and the low BE shoulder in the O 1s spectrum has been noted previously [4,16,17]. There is not only a change in the O 1s spectra shape but also a shift in energy as Y is introduced.…”

supporting

confidence: 64%

“…The importance of hole doping for the occurrence of superconductivity makes it natural to study the effect of changes in the doping. Several studies of doping dependence have been performed and one of the superconductors often studied by photoelectron spectroscopy (PES) is Bi 2 Sr 2 CaCu 2 O 81d (Bisco) [1] and the related compound Bi 2 Sr 2 Ca 12x Y x Cu 2 O 81d (Y-Bisco) [2][3][4][5][6].…”

mentioning

confidence: 99%

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Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
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Photoelectron spectroscopy data from Bi 2 Sr 2 Ca 12x Y x Cu 2 O 81d single crystals, for x 0, 0.16, and 0.55, are presented. It is shown that there are core level shifts related to the opening of a pseudogap and that similar shifts are observed at the opening of the superconducting gap in optimally doped samples. This result is in agreement with pair formation above T C as suggested by V. J. Emery and S. A. Kivelson [Nature (London) 374, 434 (1995)]. [S0031-9007(97)03557-6]

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supporting

confidence: 64%

mentioning

confidence: 99%

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
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“…This peak was previously ascribed to holes in the singlet band formed on ptype doping of the CuO 2 plane in Bi-2212, i.e., transition from 3d 9 L to O1s3d 9 (L denotes a hole in an O2p xy orbital). [10][11][12][13] A similar feature has been established for many other p-type doped superconductive copper oxides. [14][15][16] The peak at ∼530.5 eV is due to the wide antibonding Bi6p x,y,z -O and O2p x,y -O2p z band, while the shoulder at ∼529.5 eV, that is most clearly seen for the x = 0 sample, arises from a transition into O2p states hybridized with the upper Hubbard band (UHB).…”

mentioning

confidence: 65%

“…[14][15][16] The peak at ∼530.5 eV is due to the wide antibonding Bi6p x,y,z -O and O2p x,y -O2p z band, while the shoulder at ∼529.5 eV, that is most clearly seen for the x = 0 sample, arises from a transition into O2p states hybridized with the upper Hubbard band (UHB). [10][11][12][13] The O K-edge spectral features are analyzed by fitting Gaussian functions to the three pre-edge peaks. Before the fitting the spectra are first normalized to have the same spectral weight in the energy range of 535 to 555 eV, and then multiplied by the exact oxygen content of the sample as determined by wet-chemical analysis.…”

mentioning

confidence: 99%

Layer-specific hole concentrations inBi2Sr2(Y

Karppinen

Kotiranta²,

Nakane

et al. 2003

Phys. Rev. B

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Induction of holes not only in the superconductive CuO 2 plane but also in the Bi 2 O 2+δ charge reservoir of the Bi 2 Sr 2 (Y 1-x Ca x )Cu 2 O 8+δ superconductor upon Ca II -for-Y III substitution is evidenced by means of two independent techniques, i.e., high-resolution x-ray-absorption near-edge structure (XANES) spectroscopy measurements and coulometric redox titrations. The absolute values derived for the CuO 2 -plane hole concentration from the Cu L 2,3 -edge XANES spectra are in good agreement with those obtained from the coulometric redox analysis. The CuO 2 -plane hole concentration is found to increase from 0.03 to 0.14 concomitantly with the increase in the BiO 1+δ/2 -layer hole concentration from 0.00 to 0.13 as the Ca-substitution level, x, increases from 0 to 1. The threshold CuO 2 -plane hole concentration for the appearance of superconductivity is determined at 0.06, while the highest T c is obtained at the hole concentration of 0.12. In the O K-edge XANES spectrum, the increases in the CuO 2 -plane and BiO 1+δ/2 -layer hole concentrations with increasing x are seen as enhancement in the relative intensities of the pre-edge peaks at ∼528.3 and ∼530.5 eV, respectively. : 61.10.Ht; 74.62.Dh; 74.72.Hs The high-T c superconductive copper oxide, M m A 2 Q n-1 Cu n O m+2+2n±δ or M-m2(n-1)n, is believed to possess an antiferromagnetic insulating ground state related to its "undoped parent phase". By increasing the CuO 2 -plane hole concentration the phase undergoes an insulatormetal transition and starts to show superconductivity with a transition temperature, T c , that strongly depends on the concentration of induced holes. In the multi-layered structure of an Mm2(n-1)n phase the superconductive Q n-1 Cu n O 2n block containing the CuO 2 plane(s) is sandwiched with two AO layers and an M m O m±δ "charge reservoir" block with a layer sequence of AO-CuO 2 -(Q-CuO 2 ) n-1 -AO-(MO 1±δ/m ) m . 1 Among the variety of known M-m2(n-1)n phases (M = e.g. Cu, Bi, Pb, Tl, Hg, Al, Ga, B; m = 0 -3; A = e.g. Ba, Sr, La; Q = e.g. Ca, rare-earth element R; n = 1 -9), 1 only a limited number of phases, e.g. (La,Sr) ((Tl,Pb)-1212), 2-6 allow us to experimentally observe the actual appearance of superconductivity adjacent to the insulator-metal boundary. This is because many of these phases are structurally rather weak to sustain doping within a sufficiently wide range. Another difficulty arises from the fact that no universal experimental tool to accurately probe the local The accurate oxygen contents were determined by coulometric Cu + /Cu 2+ redox titration. 1,7 This experiment yields the total amount of high-valent copper and bismuth species, i.e., Cu III and Bi V , and thus the oxygen content of the sample. Upon dissolving the sample in 1 M HCl containing a known amount of Cu + ions both Cu III and Bi V oxidize Cu + to Cu 2+ according to reactions, PACSandOnce the reactions given by Eqs.(1) and (2) are completed the amount of remaining Cu + ions is accurately analyzed through coulometric titration, i.e., anodic...

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“…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: 94%

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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Photoemission study of the metal to insulator transition of Bi2Sr2Ca1−xYxCu2O8+δ

Cited by 16 publications

References 27 publications

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
View full text Add to dashboard Cite

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
View full text Add to dashboard Cite

Layer-specific hole concentrations inBi2Sr2(Y

Resonant Photoemission from Complex Cuprates and Nickelates

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Photoemission study of the metal to insulator transition of Bi2Sr2Ca1−xYxCu2O8+δ

Cited by 16 publications

References 27 publications

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1Tjernberg1, Nylén2, Chiaia3 et al. 1997Phys. Rev. Lett.233140View full textAdd to dashboardCite

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1Tjernberg1, Nylén2, Chiaia3 et al. 1997Phys. Rev. Lett.233140View full textAdd to dashboardCite

Layer-specific hole concentrations inBi2Sr2(Y

Resonant Photoemission from Complex Cuprates and Nickelates

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Product

Resources

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Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
View full text Add to dashboard Cite

Evidence of Pseudogap Related Core Level Shifts inBi2Sr2Ca1
Tjernberg¹,
Nylén²,
Chiaia³
et al. 1997
Phys. Rev. Lett.
23
3
14
0
View full text Add to dashboard Cite