One dimensional ordering of doping oxygen in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0001.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>HgBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Cuo</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math> superconductors evidenced by X-ray diffuse scattering

Izquierdo, M.; Megtert, S.; Colson, D.; Honkimäki, V.; Forget, A.; Raffy, H.; Comès, R.

doi:10.1016/j.jpcs.2010.10.055

Cited by 16 publications

(22 citation statements)

References 17 publications

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“…Band-structure calculations for undoped Hg1201 indicate the presence of a Hg-O band not far from the Fermi level which may further evolve with doping [39], but this scenario would have difficulty explaining the resonance effect on two-magnon excitations given the large spatial separation between the Cu-O and Hg layers. First-principle calculations for doped Hg1201 are technically challenging due to the complex dopant oxygen positions, which have not yet been fully determined [40].…”

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confidence: 99%

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Tacon

Matiks

et al. 2013

Phys. Rev. Lett.

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We study the model high-temperature superconductor HgBa2CuO 4+δ with electronic Raman scattering and optical ellipsometry over a wide doping range. The resonant Raman condition which enhances the scattering cross section of "two-magnon" excitations is found to change strongly with doping, and it corresponds to a rearrangement of inter-band optical transitions in the 1-3 eV range seen by ellipsometry. This unexpected change of the resonance condition allows us to reconcile the apparent discrepancy between Raman and x-ray detection of magnetic fluctuations in superconducting cuprates. Intriguingly, the strongest variation occurs across the doping level where the antinodal superconducting gap reaches its maximum.PACS numbers: 74.25.nd, 74.72.Gh, 74.72.Kf Magnetic fluctuations might play an essential role in the mechanism of high-temperature superconductivity in the cuprates [1]. Upon doping the insulating parent compounds, the fluctuations evolve from antiferromagnetic (AF) magnon excitations up to a few hundred meV. As this energy is in principle sufficient to support superconductivity at very high temperatures, the observation of similar "paramagnon" excitations by resonant inelastic x-ray scattering (RIXS) in superconducting cuprates [2] is a revealing result. Recent electronic Raman scattering (ERS) measurements further suggest that the high-energy magnetic fluctuations exhibit a pronounced change concurrent with the formation of Cooper pairs [3], corroborating a close connection between them.Here we address a major puzzle that has arisen from the comparison of the doping dependent RIXS and ERS cross sections. Both techniques use inelastic photon scattering to probe fundamental excitations in solids, but with very different incident photon energies in the xray and visible-light range, and they can detect magnetic fluctuations in the cuprates via the creation of single- [4] and two-magnon [5] excitations, respectively. In the undoped AF insulating compounds, the superexchange energies J determined by RIXS and ERS agree reasonably well [4,5] and are furthermore consistent with inelastic neutron scattering (INS) measurements [6]. A comparison between these measurements at finite doping, however, reveals an important discrepancy: while the energy and spectral weight of the (para)magnon excitations observed by RIXS exhibit little change [2,7], both of these quantities decrease substantially in ERS data [8][9][10][11]. The latter observation has created the impression that the AF spin fluctuations become overdamped near and above optimal doping [9]. This, in turn, has served as a major argument against magnetically driven Cooper pairing in the overdoped regime [12,13]. Together with the decrease of well-defined high-energy magnetic signal with doping in INS measurements [14], this has cast doubt on the interpretation of the RIXS results [15].The RIXS cross section in the cuprates is known to exhibit a non-trivial photon energy dependence [16,17], and the detection of magnetic excitations is greatly enhanced by a r...

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confidence: 99%

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Tacon

Matiks

et al. 2013

Phys. Rev. Lett.

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“…Inter- ference effects between H t,t ′ and H J are neglected. Additional phonon peaks in UD94 and OV90 (but not in UD77), possibly due to oxygen superstructures [32], are not considered. Using AF interaction and gap parameters J * = 548, 516, and 460 cm −1 and ∆ = 379, 347, and 234 cm −1 for UD77, UD94, and OV90, respectively, we find reasonable agreement between the calculation and the experiment (Fig.…”

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confidence: 99%

Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature SuperconductorHgBa2CuO4+δObserved by Electronic Raman Scattering

Tacon

Bakr

et al. 2012

Phys. Rev. Lett.

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“…This 'best fit' model of Izquierdo et al (2011) clearly captures some of the attributes of the observed diffraction pattern. The diffuse lines that appear in Fig.…”

Section: Introductionmentioning

confidence: 83%

“…There are numerous examples in fields ranging from alloys (Schweika, 1998), shape-memory alloys (Yamamoto et al, 2008), ferroelectrics (Pasciak et al, 2012), fast ion conductors (Welberry & Pasciak, 2011;Keen, 2002) and semiconductors (Barchuk et al, 2010) to high-T c superconductors (Izquierdo et al, 2006;Izquierdo et al, 2011) and even pharmaceuticals (Chan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Considering the above examples, it is perhaps quite surprising that, while there have been many studies of single-crystal diffuse scattering for alloys and ferroelectric materials, there have been very few for high-T c superconductors. The reasons for this are not apparent, since the experiments reported by Izquierdo et al (2011) for the high-T c superconductor HgBa 2 CuO 4+ (hereinafter referred to as HBCO) showed that very detailed single-crystal diffuse scattering (SCDS) patterns are readily obtainable using synchrotron radiation. An example section of data obtained by these authors is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Interpretation of diffuse scattering in the high-T_csuperconductor HgBa₂CuO_4+δ

Welberry¹,

Goossens²

2016

IUCrJ

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Published diffuse X-ray scattering from the high-T c superconductor HgBa 2 CuO 4+ has been reexamined with a view to developing a model that more satisfactorily accounts for the observed patterns. The present work agrees with the previous conclusion that the doping oxygen atoms form long and isolated interstitial chains that run in both tetragonal directions. However, a distinctly different model is proposed for the accompanying displacement patterns of the atoms surrounding these linear defects. In this new model it is proposed that it is the correlated shifts of the Ba atoms along the length of the defect chains that are the primary source of the observed scattering, and that the variations of intensity in the generated diffuse streaks of scattering originate from lateral shifts of both Hg and Ba atoms away from defects. The new model yields diffraction patterns that are in much more convincing agreement with the observations than the original model.

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One dimensional ordering of doping oxygen in HgBa2Cuo4+δ superconductors evidenced by X-ray diffuse scattering

Cited by 16 publications

References 17 publications

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature SuperconductorHgBa2CuO4+δObserved by Electronic Raman Scattering

Interpretation of diffuse scattering in the high-T_csuperconductor HgBa₂CuO_4+δ

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One dimensional ordering of doping oxygen in HgBa2Cuo4+δ superconductors evidenced by X-ray diffuse scattering

Cited by 16 publications

References 17 publications

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Doping-Dependent Photon Scattering Resonance in the Model High-Temperature SuperconductorHgBa2CuO4+δRevealed by Raman Scattering and Optical Ellipsometry

Feedback Effect on High-Energy Magnetic Fluctuations in the Model High-Temperature SuperconductorHgBa2CuO4+δObserved by Electronic Raman Scattering

Interpretation of diffuse scattering in the high-Tcsuperconductor HgBa2CuO4+δ

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Interpretation of diffuse scattering in the high-T_csuperconductor HgBa₂CuO_4+δ