scholarly journals Doping-dependent charge order correlations in electron-doped cuprates

2016 ◽  
Vol 2 (8) ◽  
pp. e1600782 ◽  
Author(s):  
Eduardo H. da Silva Neto ◽  
Biqiong Yu ◽  
Matteo Minola ◽  
Ronny Sutarto ◽  
Enrico Schierle ◽  
...  
Keyword(s):  
Wave Vector ◽  
High Temperature Superconductors ◽  
Charge Order ◽  
Superconducting Transition ◽  
X Ray ◽  
X Ray Scattering ◽  
Antiferromagnetic Correlations ◽  
Straight Segments ◽  
Sufficient Strength ◽  
Phonon Anomaly

Understanding the interplay between charge order (CO) and other phenomena (for example, pseudogap, antiferromagnetism, and superconductivity) is one of the central questions in the cuprate high-temperature superconductors. The discovery that similar forms of CO exist in both hole- and electron-doped cuprates opened a path to determine what subset of the CO phenomenology is universal to all the cuprates. We use resonant x-ray scattering to measure the CO correlations in electron-doped cuprates (La2−xCexCuO4 and Nd2−xCexCuO4) and their relationship to antiferromagnetism, pseudogap, and superconductivity. Detailed measurements of Nd2−xCexCuO4 show that CO is present in the x = 0.059 to 0.166 range and that its doping-dependent wave vector is consistent with the separation between straight segments of the Fermi surface. The CO onset temperature is highest between x = 0.106 and 0.166 but decreases at lower doping levels, indicating that it is not tied to the appearance of antiferromagnetic correlations or the pseudogap. Near optimal doping, where the CO wave vector is also consistent with a previously observed phonon anomaly, measurements of the CO below and above the superconducting transition temperature, or in a magnetic field, show that the CO is insensitive to superconductivity. Overall, these findings indicate that, although verified in the electron-doped cuprates, material-dependent details determine whether the CO correlations acquire sufficient strength to compete for the ground state of the cuprates.

scholarly journals Dynamic electron correlations with charge order wavelength along all directions in the copper oxide plane

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
F. Boschini ◽  
M. Minola ◽  
R. Sutarto ◽  
E. Schierle ◽  
M. Bluschke ◽  
...  
Keyword(s):  
Charge Order ◽  
Strongly Correlated ◽  
Coulomb Interactions ◽  
Static Charge ◽  
Temperature Dependent ◽  
X Ray ◽  
Circular Pattern ◽  
X Ray Scattering ◽  
Plane Direction ◽  
Vector Magnitude

AbstractIn strongly correlated systems the strength of Coulomb interactions between electrons, relative to their kinetic energy, plays a central role in determining their emergent quantum mechanical phases. We perform resonant x-ray scattering on Bi2Sr2CaCu2O8+δ, a prototypical cuprate superconductor, to probe electronic correlations within the CuO2 plane. We discover a dynamic quasi-circular pattern in the x-y scattering plane with a radius that matches the wave vector magnitude of the well-known static charge order. Along with doping- and temperature-dependent measurements, our experiments reveal a picture of charge order competing with superconductivity where short-range domains along x and y can dynamically rotate into any other in-plane direction. This quasi-circular spectrum, a hallmark of Brazovskii-type fluctuations, has immediate consequences to our understanding of rotational and translational symmetry breaking in the cuprates. We discuss how the combination of short- and long-range Coulomb interactions results in an effective non-monotonic potential that may determine the quasi-circular pattern.

scholarly journals Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic x-ray scattering

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
M. Yoshida ◽  
K. Ishii ◽  
M. Naka ◽  
S. Ishihara ◽  
I. Jarrige ◽  
...  
Keyword(s):  
Charge Order ◽  
Charge Fluctuations ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Charge order as seen by resonant (elastic) X-ray scattering

2012 ◽  
Vol 208 (1) ◽  
pp. 121-127 ◽  
Author(s):  
J. E. Lorenzo ◽  
Y. Joly ◽  
D. Mannix ◽  
S. Grenier
Keyword(s):  
Charge Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals ELECTRON-PHONON INTERACTION IN N-DOPED CUPRATES: AN INELASTIC X-RAY SCATTERING STUDY

2003 ◽  
Vol 17 (04n06) ◽  
pp. 484-492 ◽  
Author(s):  
M. D'ASTUTO ◽  
P. K. MANG ◽  
P. GIURA ◽  
A. SHUKLA ◽  
A. MIRONE ◽  
...  
Keyword(s):  
Phonon Dispersion ◽  
Inelastic Neutron Scattering ◽  
High Temperature Superconductors ◽  
Parent Compound ◽  
Longitudinal Optical ◽  
Small Samples ◽  
Strong Electron ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Inelastic x-ray scattering (IXS) with very high (meV) energy resolution has become a valuable spectroscopic tool, complementing the well established coherent inelastic neutron scattering (INS) technique for phonon dispersion investigations. In the study of crystalline systems IXS is a viable alternative to INS, especially in cases where only small samples are available. Using IXS, we have measured the phonon dispersion of Nd1.86Ce0.14CuO4 + δ along the [ξ, 0, 0] and [ξ, ξ, 0] in-plane directions. Compared to the undoped parent compound, the two highest longitudinal optical (LO) phonon branches are shifted to lower energies because of Coulomb-screening effects brought about by the doped charge carriers. An additional anomalous softening of the highest branch is observed around q = (0.2, 0, 0). This anomalous softening, akin to what has been observed in other compounds, provides evidence for a strong electron-phonon coupling in the electron-doped high-temperature superconductors.

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