Chemistry of High-Temperature Superconductors

Sleight, A.W.

doi:10.1126/science.242.4885.1519

Cited by 375 publications

(61 citation statements)

References 75 publications

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“…A model of the same type as MV-3 was suggested by Sleight for the BaBiO 3 superconductors, discovered by him and others before the superconducting cuprates (Sleight et al 1975;Sleight 1988). Doping in bismuthates is achieved by Pb or K and changes the composition to BaPb x Bi 1Kx O 3 and Ba 1Kx K x BiO 3 , respectively.…”

Section: Softening In Mv-3 Systemsmentioning

confidence: 99%

Mixed valence and superconductivity

Larsson

2007

Phil. Trans. R. Soc. A.

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Mixed-valence (MV) systems are referred to here as MV-2 and MV-3 depending on whether two or three consecutive valence states are involved. MV-3 systems range from systems with Hubbard U[0, corresponding to a single stable, intermediate valence state, and U/0, corresponding to stable alternating valences differing by two units. Experiments using inelastic neutron scattering or inelastic X-ray scattering show softening of breathing phonon modes in MV systems compared with related systems with a single valence. It is hypothesized that softening is due to coupling between potential energy surfaces, corresponding to differing localizations of the electron. As predicted, softening is larger in the delocalized case. A mechanism for superconductivity is suggested.

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Section: Softening In Mv-3 Systemsmentioning

confidence: 99%

Mixed valence and superconductivity

Larsson

2007

Phil. Trans. R. Soc. A.

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“…Furthermore, since lattice constants of the a-axis and the b-axis of Bi2212 are very close (a = 5.414 Å, b = 5.418 Å), 7 usually so-called "ab-twinning" is formed. 8 Since the ab-twinning is in-plane 90 • misorientation defects, 8 it is necessary to be suppressed. As a one of substrates satisfying these requirements, vicinal (100) substrates of SrTiO 3 (STO) had been used, of which (100) plane of the substrate was inclined by 4 ∼ 6 • toward the [111] direction.…”

Section: Introductionmentioning

confidence: 99%

Preparation of (11n) oriented Bi2Sr2CaCu2O8+x thin films without c-axis twin structure by the metal-organic decomposition method using vicinal SrTiO3 (110) substrates

et al. 2018

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ARTICLES YOU MAY BE INTERESTED INProbing the internal energy structure of a serially coupled double quantum dot system with Rashba spin-orbit coupling through finite-frequency shot noise AIP Advances 8, 015001 (2018) We have prepared (11n) oriented Bi 2 Sr 2 CaCu 2 O 8+x (Bi2212) thin films by metalorganic decomposition method. The vicinal (110) substrate of SrTiO 3 (STO) inclined toward the [110] direction was used for suppressing "c-twinning". In the sample prepared in the O 2 atmosphere, only the (11n) peak appeared in the θ-2θ X-ray diffraction pattern. When the miscut angle of the substrate was ϕ = 10 • , it was shown by the scanning electron microscope images and the (008) pole figures that the c-axis was inclined by about 38 • and the c-twinning was substantially suppressed. ρ ab and ρ c of this sample were calculated by the corrected van der Pauw method and component calculation of the two-dimensional resistivity tensor. The superconducting transition temperatures were T c = 81 K. The temperature dependence of ρ ab was a typical metallic behavior reflecting the characteristics of the ab-plane of Bi2212. On the other hand, that of ρ c did not become a typical semiconductor behavior in the c-axis direction of Bi2212, but it showed a metallic behavior. The anisotropic parameter γ was about 10.

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“…[2][3][4][5] All of these copper-oxide superconductors contain perovskite CuO 2 conducting layers and rock-salt A-O layers as their structural building blocks. The m values are 1 and 2 when these compounds have single and double rock-salt A-O layers, respectively, while the n values define the number of CuO 2 layers in a unit cell.…”

Section: Introductionmentioning

confidence: 99%

Relationship Between the Structure and the Superconductivity in LaFeAsO

Jung¹,

Cho²,

Lee³

2013

Bulletin of the Korean Chemical Society

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The electronic structure of LaFeAsO was analyzed by tight-binding band calculation based upon the normal and shrunk lattices. A strong Fermi surface nesting was found in the normal LaFeAsO, while most of the nesting area was disappeared in the shrunk LaFeAsO. It was found, therefore, high pressure atmosphere is required to become a superconductor for LaFeAsO by suppressing the SDW (spin density wave) state through the disappearance of the Fermi surface nesting.

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Chemistry of High-Temperature Superconductors

Cited by 375 publications

References 75 publications

Mixed valence and superconductivity

Mixed valence and superconductivity

Preparation of (11n) oriented Bi2Sr2CaCu2O8+x thin films without c-axis twin structure by the metal-organic decomposition method using vicinal SrTiO3 (110) substrates

Relationship Between the Structure and the Superconductivity in LaFeAsO

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