Synthesis, structure, and properties of the high-temperature superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:

Hodges, J. P.; Gameson, I.; Edwards, Peter P.; Kharel, A. P.; Porch, Adrian

doi:10.1103/physrevb.55.12776

Cited by 12 publications

(2 citation statements)

References 25 publications

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“…When the compound is enriched with oxygen, HgBa 2 CuO 4+δ , it becomes superconducting, with T c,max = 98 K. 32 Where will the excess oxygen atoms be embedded? The conventional assignment, based on neutron scattering 32,33 and X-ray diffraction, 34 is at the center of the Hg planes, ( data. [32][33][34] (ii) The decreasing separation of the Ba and O(2) planes with oxygen enrichment is interpreted as the result of charge-transfer from O(3) sites to the CuO 2 planes.…”

Section: Stripes In Hgba 2 Cuo 4+δmentioning

confidence: 99%

“…The conventional assignment, based on neutron scattering 32,33 and X-ray diffraction, 34 is at the center of the Hg planes, ( data. [32][33][34] (ii) The decreasing separation of the Ba and O(2) planes with oxygen enrichment is interpreted as the result of charge-transfer from O(3) sites to the CuO 2 planes. 32 Deviating from the conventional assignment, it is assumed here that excess O atoms are embedded in the center of CuO 33,35).…”

Section: Stripes In Hgba 2 Cuo 4+δmentioning

confidence: 99%

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Stripes in oxygen-enriched cuprates

Bucher¹

2020

Preprint

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Charge-order stripes of different types occur when copper oxides are doped with either heterovalent metal, like La 2−x Sr x CuO 4 , or oxygen doped, like Y Ba 2 Cu 3 O 6+y . The difference shows up in the doping dependence of their incommensurability: q c (x) ∝ √ x − p but q c (y) ≈ 0.3. The square-root dependence in the former compound family results from Coulomb repulsion between doped holes (or electrons), residing pairwise in lattice-site O (or Cu) atoms of the CuO 2 planes.The almost constant q c (y) value in the second family results from the aggregation of ozone-like molecules, formed from O 2− ions of the host with embedded oxygen atoms, O, at interstitial sites in the CuO 2 planes. The magnetic moments, m(O), of the lattice-defect O atoms in the first family arrange antiferromagnetically, which gives rise to accompanying magnetization stripes of incommensurability q m (x) = 1 2 q c (x). The ozone complexes have a vanishing magnetic moment, m = 0, which explains the absence of accompanying magnetization stripes in the second family.Embedding excess oxygen as O atoms in CuO 2 planes is likewise assumed for HgBa 2 CuO 4+δ and oxygen-enriched bismuth cuprates. A combination of characteristics from both families is present in oxygen-enriched La 2 CuO 4+y . The validity of determining the hole density in oxygen-enriched cuprates with the universal-dome method is independently confirmed. Besides causing different types of stripes, the two types of lattice-defect oxygen may also cause different types of superconductivity. This could explain the much higher T c,max in oxygen-enriched than Ae-doped cuprates, as well as the cusped cooling-curves of X-ray intensity diffracted by stripes in the former family.

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