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Strempfer, J.; Zegkinoglou, Ioannis; Rütt, U.; Zimmermann, M. v.; Bernhard, C.; Lin, C. T.; Wolf, Th.; Keimer, B.

doi:10.1103/physrevlett.93.157007

Cited by 36 publications

(33 citation statements)

References 27 publications

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“…A qualitative picture can, however, be drawn from the doping dependence of the width of the superstructure peak measured at the L 3 resonance of chain Cu at q = (0.5, 0, l) [23,24]; note that in our rocking scans that cover the range 0.45- 0.55 for h, l varies between ∼ 1 and 0.5 (see Section ). The YBCO 6.6 crystal showed ortho-VIII correlations, and ortho-III correlations were observed in the crystals with higher oxygen contents, again in agreement with prior work [42,56]. Crystals with x ≥ 0.79 only showed ortho-I correlations.…”

Section: Methodssupporting

confidence: 89%

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

et al. 2014

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We report the results of a comprehensive study of charge density wave (CDW) correlations in untwinned YBa2Cu3O6+x single crystals with 0.4 ≤ x ≤ 0.99 using Cu-L3 edge resonant x-ray scattering (RXS). Evidence of CDW formation is found for 0.45 ≤ x ≤ 0.93 (hole doping levels 0.086 p 0.163), but not for samples with x ≤ 0.44 (p 0.084) that exhibit incommensurate spin-density-wave order, and in slightly overdoped samples with x = 0.99 (p ∼ 0.19). This suggests the presence of two proximate zero-temperature CDW critical points at pc1 ∼ 0.08 and pc2 ∼ 0.18. Remarkably, pc2 is close to the doping level that is optimal for superconductivity. The CDW reflections are observed at incommensurate in-plane wave vectors (δa, 0) and (0, δ b ) with δa δ b . Both δa and δ b decrease linearly with increasing doping, in agreement with recent reports on Bibased high-Tc superconductors, but in sharp contrast to the behavior of the La2−x(Ba,Sr)xCuO4 family. The CDW intensity and correlation length exhibit maxima at p ∼ 0.12, coincident with a plateau in the superconducting transition temperature Tc. The onset temperature of the CDW reflections depends non-monotonically on p, with a maximum of ∼ 160 K for p ∼ 0.12. The RXS reflections exhibit a uniaxial intensity anisotropy. Whereas in strongly underdoped samples the reflections at (δa, 0) are much weaker than those at (0, δ b ), the anisotropy is minimal for p ∼ 0.12, and reversed close to optimal doping. We further observe a depression of CDW correlations upon cooling below Tc, and (for samples with p ≥ 0.09) an enhancement of the signal when an external magnetic field up to 6 T is applied in the superconducting state. For samples with p ∼ 0.08, where prior work has revealed a field-enhancement of incommensurate magnetic order, the RXS signal is field-independent. This supports a previously suggested scenario in which incommensurate charge and spin orders compete against each other, in addition to individually competing against superconductivity (Blanco-Canosa et al., Phys. Rev. Lett. 110, 187001 (2013)). We discuss the relationship of these results to prior observations of "stripe" order in La2−x(Ba,Sr)xCuO4, the "pseudogap" phenomenon, superconducting fluctuations, and quantum oscillations, as well as their implications for the mechanism of high-temperature superconductivity.

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Section: Methodssupporting

confidence: 89%

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

et al. 2014

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“…44,45 Recently, defuse x-ray scattering measurements revealed the existence of lattice modulations favorable for discrete breathers. 46,47 The 4a × 4a lattice modulation in cuprates may occur due to "frozen" discrete breathers.…”

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MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Mourachkine

2005

Mod. Phys. Lett. B

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The main purpose of this brief review is to present a sketch of the mechanism of high-Tc superconductivity based mainly on tunneling measurements in cuprates. In the review, we shall mostly discuss tunneling spectroscopy in Bi 2 Sr 2 CaCu 2 O 8 . Analysis of the data shows that the Cooper pairs in cuprates are topological excitations (e.g. quasi-one dimensional bisolitons, discrete breathers etc.), and the phase coherence among the Cooper pairs appears due to spin fluctuations.

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“…As an example, diffuse scattering studies have probed the nature and the spatial (nano-) distributions of oxygen superstructures in pure [11][12][13] and Ca-doped 13 YBCO as a function of δ.…”

Section: Introductionmentioning

confidence: 99%

Effect of Local Disorder on the Transport Properties of Al-Doped SmBa₂Cu₃O_6+δ Superconductors

et al. 2010

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In this work we present the investigation of the structural disorder induced by Al doping in SmBa 2 Cu 2.67 Al 0.33 O 6+δ superconductors in direct correlation with their transport properties. The interest in such superconducting materials lies in the possibility of extending the δ range of the underdoped region of REBa 2 Cu 3 O 6+δ superconductors, where phenomena such as pseudogap and superconducting diamagnetic fluctuations above T C appear. The pair distribution function analysis of high-resolution powder diffraction data has shown that local distortions are present in the proximity of the Al dopant ions. Disorder spreads to the superconducting Cu2-O3 planes producing corrugations in these planes, associated with a decrease of superconducting charge carriers. Conductivity and magnetization measurements have demonstrated that Aldoping affects the charge transport mechanism: Anderson localization and superconductivity coexist, and the T and δ superconducting domains are strongly reduced. Al doping allows not only controlling chemically the charge carrier concentration but also the potential fluctuations within the Cu2-O2/3 planes and appears to be a powerful tool for the investigation of the underdoped zone of REBa 2 Cu 3 O 6+δ superconductors.

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Oxygen Superstructures Throughout the Phase Diagram of(Y,Ca)Ba2C

Cited by 36 publications

References 27 publications

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Effect of Local Disorder on the Transport Properties of Al-Doped SmBa₂Cu₃O_6+δ Superconductors

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Oxygen Superstructures Throughout the Phase Diagram of(Y,Ca)Ba2C

Cited by 36 publications

References 27 publications

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

Resonant x-ray scattering study of charge-density wave correlations inYBa2Cu3O6+x

MECHANISM OF HIGH-Tc SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Effect of Local Disorder on the Transport Properties of Al-Doped SmBa2Cu3O6+δ Superconductors

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Product

Resources

About

MECHANISM OF HIGH-T_c SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

Effect of Local Disorder on the Transport Properties of Al-Doped SmBa₂Cu₃O_6+δ Superconductors