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Hamada, Nobuyuki; Massidda, S.; Freeman, Arthur J; Redinger, J.

doi:10.1103/physrevb.40.4442

Cited by 71 publications

(35 citation statements)

References 58 publications

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“…The crystal structure is a distorted (0 ≤ x < x c ) or cubic (x c < x) three-dimensional perovskite [3], where x c ∼ 0.38. The parent compound BaBiO 3 is an insulator in contrast to the prediction of band theory that it is a metal with the half-filled nondegenerate Bi 6s-O 2p antibonding band crossing the Fermi level (E F ) [4][5][6][7]. This discrepancy between band theory and experiment is accounted for as due to a charge disproportionation of Bi into Bi 3+ and Bi 5+ sites or a CDW formation accompanied by breathing and tilting distortions of the BiO 6 octahedra [4,8,9].…”

Section: Introductionmentioning

confidence: 59%

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
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We have performed x-ray absorption spectroscopy (XAS) and x-ray photoemission spectroscopy (XPS) studies of single crystal Ba1−xKxBiO3 (BKBO) covering the whole composition range 0 ≤ x ≤ 0.60. Several features in the oxygen 1s core XAS spectra show systematic changes with x. Spectral weight around the absorption threshold increases with hole doping and shows a finite jump between x = 0.30 and 0.40, which signals the metal-insulator transition. We have compared the obtained results with band-structure calculations. Comparison with the XAS results of BaPb1−xBixO3 has revealed quite different doping dependences between BKBO and BPBO. We have also observed systematic core-level shifts in the XPS spectra as well as in the XAS threshold as functions of x, which can be attributed to a chemical potential shift accompanying the hole doping. The observed chemical potential shift is found to be slower than that predicted by the rigid band model based on the band-structure calculations. 71.30.+h,74.25.Jb,74.70.Ad

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Section: Introductionmentioning

confidence: 59%

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
View full text Add to dashboard Cite

show abstract

“…Photoemission studies [5] show that with increasing x the spectra are shifted towards the Fermi level, indicating a decrease of Ev with increased hole doping. However, the magnitude of the shift is considerably smaller than that predicted by band-structure analyses [4,8]. These calculations are based on an assumed rigid-band emptying of the conduction band with K doping ('hole count'), which apparently is too simple an interpretation.…”

Section: Interpretations Of Superconductivity In (Ba K) Bi03mentioning

confidence: 79%

“…The disordered phase would have the same breathing-type distortion, but only on a local (or dynamical) scale. Also for the superconducting phase of BKBO there is some evidence [4] that two different Bi-O distances continue to exist. It should be emphasized that in this framework the assignment 'Bi 3 ÷', 'Bi s +' is certainly too radical a notation; it only indicates different types of Bi-O bonding in the bismuthates.…”

Section: Structural Properties Of Bkbo and Bpbomentioning

confidence: 99%

“…However, the orthorhombic material is a semiconductor; this poses a problem, since tilting alone cannot be expected to destroy metallicity of the undistorted cubic phase. Instead, it has been suggested [4,7] that in the orthorhombic phase the degree of ordering of 'Bi 3÷' and 'Bi 5+' is continuously reduced by increased K doping, i.e. the monoclinic-orthorhombic transition is of order-disorder type.…”

Section: Structural Properties Of Bkbo and Bpbomentioning

confidence: 99%

“…Excellent reviews can be found a.o. in papers by Boyce et al [3], Hamada et al [4] and, more recently, by Namatame et al [5,6]. We will first consider properties of (Ba,K) BiO3, usually abbreviated BKBO, together with Ba(Pb,Bi) 03 or BPBO, and later concentrate on BKBO as a member of the 'high-Tc' family (Tc >~ 30 K).…”

Section: Superconductivi~ In the Bismuthatesmentioning

confidence: 99%

See 2 more Smart Citations

Long-term control of neuronal excitability by corticosteroid hormones

Joëls

Hesen

Kloet

1995

The Journal of Steroid Biochemistry and Molecular Biology

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Long-term control of neuronal excitability by corticosteriod hormonesJoëls, M.; Hesen, W.S.; de Kloet, E.R. Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractAfter a critical survey of current interpretations of superconductivity in (Ba,K)BiO3, we present a quantitative analysis of this system, with emphasis on dependence of the critical temperature on potassium content and on pressure (external or 'chemical'). Adopting a BCS formalism, Cooper-pair formation is assumed not to be phonon-mediated, but to arise from indirect-exchange interactions between conduction electrons via oxygen anions (oxygen valence band), by analogy with previous analyses of cuprate high-T c superconductors. Numerical calculations are carried through with, and without, accounting for shrinkage of the lattice with increasing potassium content. Results for pressure gradients of T c, at varying doping, and T c under pressures up to 20 GPa, are compared with experimental data. Extension of the analysis to the bismuthate Ba(Pb,Bi)O 3 is outlined.

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XPS study of Ba_0.6K_0.4BiO₃

Zhao

Norton

1993

Chin. J. Chem.

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Single crystal Ba0.6K0.4BiO3 was studied by using XPS. The results show that there is no evidence for the presence of Bi5+ in single crystal of Ba0.6K0.4BiO3; instead, there is evidence for the presence of mixed valent Bi3+ and Bi(3+)‐δ. Moreover, the Ols XPS results suggest the presence of mixed valent O2− and O1−, and the valence band spectrum suggests the high degree of covalency for Bi—O bonds.

show abstract

Electronic structure, photoemission, inverse photoemission, and x-ray emission spectra of superconductingBa1−x

Cited by 71 publications

References 58 publications

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
View full text Add to dashboard Cite

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
View full text Add to dashboard Cite

Long-term control of neuronal excitability by corticosteroid hormones

XPS study of Ba_0.6K_0.4BiO₃

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Electronic structure, photoemission, inverse photoemission, and x-ray emission spectra of superconductingBa1−x

Cited by 71 publications

References 58 publications

Doping dependence of the electronic structure ofBa1−xKxBiOKobayashi1, Mizokawa2, Ino3 et al. 1999Phys. Rev. B162100View full textAdd to dashboardCite

Doping dependence of the electronic structure ofBa1−xKxBiOKobayashi1, Mizokawa2, Ino3 et al. 1999Phys. Rev. B162100View full textAdd to dashboardCite

Long-term control of neuronal excitability by corticosteroid hormones

XPS study of Ba0.6K0.4BiO3

Contact Info

Product

Resources

About

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
View full text Add to dashboard Cite

Doping dependence of the electronic structure ofBa1−xKxBiO
Kobayashi
¹
,
Mizokawa
²
,
Ino
³

et al. 1999
Phys. Rev. B
16
2
10
0
View full text Add to dashboard Cite

XPS study of Ba_0.6K_0.4BiO₃