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Sassa, Yasmine; Radović, M.; Må̊nsson, Martin; Razzoli, Elia; Cui, X. Y.; Pailhés, S.; Guerrero, Sebastian; Shi, M.; Willmott, P. R.; Granozio, F. Miletto; Mesot, J.; Norman, M. R.; Patthey, L.

doi:10.1103/physrevb.83.140511

Cited by 30 publications

(28 citation statements)

References 22 publications

(24 reference statements)

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“…19,20 The oxygen chain puddles had the Ortho-II lattice superstructure, like the YBa 2 Cu 3 O 6.5 , which showed band folding and Fermi surface reconstruction measured by photoemission and quantum oscillations experiments. 48,49 The granular structure of Ortho-II puddles favored the 7 K superconductivity; in fact, in the rapidly quenched sample from T > 450 K, where the Ortho-II puddles were not formed, the critical temperature drops to zero.…”

Section: Discussionmentioning

confidence: 99%

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

et al. 2013

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Oxygen chain fragments are known to appear at the insulator-to-superconductor transition in YBa 2 Cu 3 O 6+y . However, the self-organization and the size distribution of oxygen chain fragments are not known. Here, we seek to fill this gap, using scanning micro-x-ray diffraction, which is an imaging method based on advances in focusing a synchrotron radiation beam. This approach allows us to probe both real-space and k-space of high-quality YBa 2 Cu 3 O 6.33 single crystals with T c = 7 K. We report compelling evidence for nanoscale striped puddles, with Ortho-II structure, made of chain fragments in the basal Cu(1) plane with local oxygen concentration y 0.5. The size of the Ortho-II puddles spans a range between 2 and 9 nm. The real-space imaging of Ortho-II puddles granular network shows that superconductivity, at a low hole-doping regime, occurs in a network of nanoscale oxygen ordered patches, interspersed with oxygen depleted regions. The manipulation by thermal treatments of the striped Ortho-II puddles has been investigated focusing on the spontaneous symmetry breaking near the order-to-disorder phase transition at T 0 = 350 K.

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Section: Discussionmentioning

confidence: 99%

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

et al. 2013

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“…The only difference with the conventional LDA band structure is a rough renormalization of t (from 0.38 eV to 0.15 eV), which is supported by many ARPES experiments that find that LDA overestimates the bandwidth. A more recent ARPES measurement on thin films paints a somewhat more complex picture (28). The Hamiltonian without disorder can be written as…”

Section: Modelmentioning

confidence: 99%

Quantum oscillations in YBa ₂ Cu ₃ O _6+δ from period-8 d -density wave order

Eun

Wang

Chakravarty

2012

Proc. Natl. Acad. Sci. U.S.A.

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We consider quantum oscillation experiments in YBa 2 Cu 3 O 6+δ from the perspective of Fermi surface reconstruction using an exact transfer matrix method and the Pichard–Landauer formula for the conductivity. The specific density wave order responsible for reconstruction is a period-8 d -density wave in which the current density is unidirectionally modulated, which is also naturally accompanied by a period-4 charge order, consistent with recent nuclear magnetic resonance experiments. This scenario leads to a natural explanation as to why only oscillations from a single electron pocket of a frequency of about 500 T is observed, and a hole pocket of roughly twice the frequency as dictated by the twofold commensurate order and the Luttinger sum rule is not observed. In contrast period-8 d -density wave leads to a hole pocket of roughly half the frequency of the electron pocket. The observation of this slower frequency will require higher, but not unrealistic, magnetic fields than those commonly employed. There is already some suggestion of the slower frequency in a measurement in fields as high as 85 T.

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“…5 Thus, current band structure models of YBCO differ significantly at higher energies. [5][6][7] In contrast, resonant inelastic x-ray scattering (RIXS) of transition metal oxides provides a momentum-resolved access to various electronic, magnetic and phononic excitations in a large energy range [8][9][10][11] with an unprecedented sensitivity. Moreover, it also operates on small sample sizes and even films, 12 without suffering from surface quality problems.…”

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confidence: 99%

Resonant inelastic x-ray scattering as a probe of band structure effects in cuprates

et al. 2016

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We analyze within quasi-particle theory a recent resonant inelastic x-ray scattering (RIXS) experiment on YBa2Cu3O6+x with the incoming photon energy detuned at several values from the resonance maximum [Minola et al., Phys. Rev. Lett. 114, 217003 (2015)]. Surprisingly, the data shows much weaker dependence on detuning than expected from recent measurements on a different cuprate superconductor, Bi2Sr2CuO6+x [Guarise et al., Nat. Commun. 5, 5760 (2014)]. We demonstrate here, that this discrepancy, originally attributed to collective magnetic excitations, can be understood in terms of the differences between the band structures of these materials. We find good agreement between theory and experiment over a large range of dopings, both in the underdoped and in the overdoped regime. Moreover, we demonstrate that the RIXS signal depends sensitively on excitations at energies well above the Fermi surface, that are inaccessible to traditionally used band structure probes, such as angle-resolved photemisson spectroscopy. This makes RIXS a powerful probe of band structure, not suffering from surface preparation problems and small sample sizes, making it potentially applicable to a number of cuprate materials.

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Ortho-II band folding in YBa2Cu3O

Cited by 30 publications

References 22 publications

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

Quantum oscillations in YBa ₂ Cu ₃ O _6+δ from period-8 d -density wave order

Resonant inelastic x-ray scattering as a probe of band structure effects in cuprates

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Ortho-II band folding in YBa2Cu3O

Cited by 30 publications

References 22 publications

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

Scanning micro-x-ray diffraction unveils the distribution of oxygen chain nanoscale puddles in YBa2Cu3O6.33

Quantum oscillations in YBa 2 Cu 3 O 6+δ from period-8 d -density wave order

Resonant inelastic x-ray scattering as a probe of band structure effects in cuprates

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Quantum oscillations in YBa ₂ Cu ₃ O _6+δ from period-8 d -density wave order