scholarly journals Revival of Charge Density Waves and Charge Density Fluctuations in Cuprate High-Temperature Superconductors

2020 ◽  
Vol 5 (4) ◽  
pp. 70
Author(s):  
Carlo Di Castro
Keyword(s):  
Charge Density ◽  
Fermi Liquid ◽  
Scientific Community ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Charge Density Waves ◽  
Density Fluctuations ◽  
Research Activity ◽  
Current Research Activity ◽  
Short Memory

I present here a short memory of my scientific contacts with K.A. Müller starting from the Interlaken Conference (1988), Erice (1992 and 1993), and Cottbus (1994) on the initial studies on phase separation (PS) and charge inhomogeneity in cuprates carried out against the view of the majority of the scientific community at that time. Going over the years and passing through the charge density wave (CDW) instability of the correlated Fermi liquid (FL) and to the consequences of charge density fluctuations (CDFs), I end with a presentation of my current research activity on CDWs and the related two-dimensional charge density fluctuations (2D-CDFs). A scenario follows of the physics of cuprates, which includes the solution of the decades-long problem of the strange metal (SM) state.

scholarly journals Translation-Invariant Bipolarons and Charge Density Waves in High-Temperature Superconductors

2021 ◽  
Vol 9 ◽  
Author(s):  
Victor D. Lakhno
Keyword(s):  
Charge Density ◽  
High Temperature Superconductors ◽  
Bose Condensate ◽  
Density Wave ◽  
Charge Density Waves ◽  
Superconducting Transition ◽  
Density Waves ◽  
Translation Invariant ◽  
Pseudogap Phase ◽  
Pair Density

A correlation is established between the theories of superconductivity based on the concept of charge density waves (CDWs) and the translation invariant (TI) bipolaron theory. It is shown that CDWs are originated from TI-bipolaron states in the pseudogap phase due to the Kohn anomaly and form a pair density wave (PDW) for wave vectors corresponding to nesting. Emerging in the pseudogap phase, CDWs coexist with superconductivity at temperatures below those of superconducting transition, while their wave amplitudes decrease as a Bose condensate is formed from TI bipolarons, vanishing at zero temperature.

scholarly journals Emergent charge order from correlated electron-phonon physics in cuprates

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
S. Banerjee ◽  
W. A. Atkinson ◽  
A. P. Kampf
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Charge Order ◽  
Charge Density Waves ◽  
Charge Ordering ◽  
Momentum Dependence ◽  
Electronic Correlations

Abstract Charge-density wave order is now understood to be a widespread feature of underdoped cuprate high-temperature superconductors, although its origins remain unclear. While experiments suggest that the charge-ordering wavevector is determined by Fermi-surface nesting, the relevant sections of the Fermi surface are featureless and provide no clue as to the underlying mechanism. Here, focusing on underdoped YBa2Cu3O6+x, we propose that charge-density waves form from the incipient softening of a bond-buckling phonon. The momentum dependence of its coupling to itinerant electrons favourably selects the wavevector found in experiments. But, it requires quasiparticle renormalization by strong electronic correlations to enable a unique enhancement of the charge susceptibility near the B1g-phonon selected wavevector. The B1g phonon frequency softens by a few percent, and finite-range charge-density wave correlations will form locally, if nucleated by defects or dopant disorder. These results suggest that underdoped cuprates cannot be understood in the context of strong electronic correlations alone.

scholarly journals Charge density waves and their transitions in anisotropic quantum Hall systems

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yuchi He ◽  
Kang Yang ◽  
Mark Oliver Goerbig ◽  
Roger S. K. Mong
Keyword(s):  
Phase Transitions ◽  
Charge Density ◽  
Density Wave ◽  
Quantum Hall ◽  
Charge Density Waves ◽  
Stripe Phase ◽  
Electron Bubble ◽  
First Order ◽  
Bubble Phase ◽  
First Order Phase

AbstractIn recent experiments, external anisotropy has been a useful tool to tune different phases and study their competitions. In this paper, we look at the quantum Hall charge density wave states in the N = 2 Landau level. Without anisotropy, there are two first-order phase transitions between the Wigner crystal, the 2-electron bubble phase, and the stripe phase. By adding mass anisotropy, our analytical and numerical studies show that the 2-electron bubble phase disappears and the stripe phase significantly enlarges its domain in the phase diagram. Meanwhile, a regime of stripe crystals that may be observed experimentally is unveiled after the bubble phase gets out. Upon increase of the anisotropy, the energy of the phases at the transitions becomes progressively smooth as a function of the filling. We conclude that all first-order phase transitions are replaced by continuous phase transitions, providing a possible realisation of continuous quantum crystalline phase transitions.

X-ray diffraction study of the transient structure of sliding charge density waves in NbSe3

2002 ◽  
Vol 12 (9) ◽  
pp. 181-182
Author(s):  
H. Requardt ◽  
D. Rideau ◽  
R. Danneau ◽  
A. Ayari ◽  
F. Ya Nad ◽  
...  
Keyword(s):  
Charge Density ◽  
Density Wave ◽  
Charge Density Waves ◽  
X Ray Diffraction ◽  
X Ray ◽  
Slowing Down ◽  
Current Contact ◽  
Decay Profile ◽  
Stretched Exponential Decay ◽  
Transient Structure

We present high resolution X-ray diffraction measurements on NbSe3 of the charge-density-wave (CDW) relaxation from the deformation created by the sliding of the CDW. The data are taken in the temperature range 75 K < T < 105 K in the upper-CDW phase of NbSe, and cover spatial positions up to $8OO~\mu$m from the current contact. Convenient fits to the data are obtained by a stretched exponential decay profile yielding exponents μ in the range of 0.4–0.7 and relaxation time-scales τ of the order of 1–150 ms. becoming faster with increasing sample temperature and slowing down with increasing distance from the current contact.

scholarly journals Energy Scale of the Charge Density Wave in Cuprate Superconductors

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 20
Author(s):  
Sacuto ◽  
Loret ◽  
Auvray ◽  
Civelli ◽  
Indranil ◽  
...  
Keyword(s):  
High Temperature ◽  
Charge Density ◽  
Charge Density Wave ◽  
Cuprate Superconductors ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Energy Scale ◽  
Hole Doping ◽  
Wide Range

The cuprate high temperature superconductors develop spontaneous charge density wave(CDW) order below a temperature TCDW and over a wide range of hole doping (p). [...]

scholarly journals Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi2Sr2LaCuO6+δ

2020 ◽  
Vol 117 (28) ◽  
pp. 16219-16225 ◽  
Author(s):  
Jiemin Li ◽  
Abhishek Nag ◽  
Jonathan Pelliciari ◽  
Hannah Robarts ◽  
Andrew Walters ◽  
...  
Keyword(s):  
Charge Density ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Charge Density Waves ◽  
Valence Electron Density ◽  
X Ray Scattering ◽  
Bond Stretching ◽  
Comprehensive Picture ◽  
Strong Hybridization ◽  
Orbital Character

Charge-density waves (CDWs) are ubiquitous in underdoped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3dand O-2porbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate underdoped Bi2Sr1.4La0.6CuO6+δusing resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly overdoped Bi2Sr1.8La0.2CuO6+δ, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasistatic CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.

scholarly journals Negative differential resistance observed on the charge density wave of a transition metal dichalcogenide

Nanoscale ◽  
2019 ◽  
Vol 11 (46) ◽  
pp. 22351-22358 ◽  
Author(s):  
Adina Luican-Mayer ◽  
Yuan Zhang ◽  
Andrew DiLullo ◽  
Yang Li ◽  
Brandon Fisher ◽  
...  
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Voltage Pulse ◽  
Negative Differential Resistance ◽  
Charge Density Wave ◽  
Density Wave ◽  
Differential Resistance ◽  
Charge Density Waves ◽  
Transition Metal Dichalcogenide ◽  
Physical Phenomena

Charge density waves and negative differential resistance are seemingly unconnected physical phenomena but they coexist after a voltage pulse manipulation on TaS2 surface with an STM tip.

scholarly journals Dynamical charge density fluctuations pervading the phase diagram of a Cu-based high-Tc superconductor

Science ◽  
2019 ◽  
Vol 365 (6456) ◽  
pp. 906-910 ◽  
Author(s):  
R. Arpaia ◽  
S. Caprara ◽  
R. Fumagalli ◽  
G. De Vecchi ◽  
Y. Y. Peng ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Charge Density ◽  
Charge Density Waves ◽  
Density Fluctuations ◽  
Large Area ◽  
High Tc ◽  
Superconducting Cuprates ◽  
X Ray Scattering ◽  
Underdoped Region ◽  
Dynamical Charge

Charge density modulations have been observed in all families of high–critical temperature (Tc) superconducting cuprates. Although they are consistently found in the underdoped region of the phase diagram and at relatively low temperatures, it is still unclear to what extent they influence the unusual properties of these systems. Using resonant x-ray scattering, we carefully determined the temperature dependence of charge density modulations in YBa2Cu3O7–δ and Nd1+xBa2–xCu3O7–δ for several doping levels. We isolated short-range dynamical charge density fluctuations in addition to the previously known quasi-critical charge density waves. They persist up to well above the pseudogap temperature T*, are characterized by energies of a few milli–electron volts, and pervade a large area of the phase diagram.

Sign in / Sign up

Export Citation Format

Share Document