scholarly journals Strange metal behaviour from charge density fluctuations in cuprates

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Götz Seibold ◽  
Riccardo Arpaia ◽  
Ying Ying Peng ◽  
Roberto Fumagalli ◽  
Lucio Braicovich ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Density Fluctuations ◽  
Metallic State ◽  
Microscopic Mechanism ◽  
Correlation Lengths ◽  
New Class ◽  
X Ray Scattering ◽  
Liquid Theory ◽  
Marginal Fermi Liquid

AbstractBesides the mechanism responsible for high critical temperature superconductivity, the grand unresolved issue of the cuprates is the occurrence of a strange metallic state above the so-called pseudogap temperature T*. Even though such state has been successfully described within a phenomenological scheme, the so-called Marginal Fermi-Liquid theory, a microscopic explanation is still missing. However, recent resonant X-ray scattering experiments identified a new class of charge density fluctuations characterized by low characteristic energies and short correlation lengths, which are related to the well-known charge density waves. These fluctuations are present over a wide region of the temperature-vs-doping phase diagram and extend well above T*. Here we investigate the consequences of charge density fluctuations on the electron and transport properties and find that they can explain the strange metal phenomenology. Therefore, charge density fluctuations are likely the long-sought microscopic mechanism underlying the peculiarities of the metallic state of cuprates.

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.

scholarly journals Charge Density Waves in YBa2Cu3O6.67 Probed by Resonant X-Ray Scattering under Uniaxial Compression

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
H.-H. Kim ◽  
E. Lefrançois ◽  
K. Kummer ◽  
R. Fumagalli ◽  
N. B. Brookes ◽  
...  
Keyword(s):  
Charge Density ◽  
Uniaxial Compression ◽  
Charge Density Waves ◽  
Density Waves ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

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 Study of charge stripes and charge density waves using X-ray scattering

2011 ◽  
Vol 67 (a1) ◽  
pp. C581-C581
Author(s):  
C. Du ◽  
S. -H. Lee ◽  
C. -L. Huang ◽  
Y. -C. Lai ◽  
P. -F. Wu ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Density Waves ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

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 Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Li Yue ◽  
Shangjie Xue ◽  
Jiarui Li ◽  
Wen Hu ◽  
Andi Barbour ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
High Temperature Superconductors ◽  
Thermal Fluctuations ◽  
Charge Density Waves ◽  
Density Waves ◽  
X Ray Diffraction ◽  
Correlation Lengths ◽  
Lower Temperature

AbstractCharge density waves (CDWs) in the cuprate high-temperature superconductors have evoked much interest, yet their typical short-range nature has raised questions regarding the role of disorder. Here we report a resonant X-ray diffraction study of ZrTe$${}_{3}$$3, a model CDW system, with focus on the influence of disorder. Near the CDW transition temperature, we observe two independent signals that arise concomitantly, only to become clearly separated in momentum while developing very different correlation lengths in the well-ordered state that is reached at a distinctly lower temperature. Anomalously slow dynamics of mesoscopic charge domains are further found near the transition temperature, in spite of the expected strong thermal fluctuations. Our observations signify the presence of distinct experimental fingerprints of pristine and disorder-perturbed CDWs. We discuss the latter also in the context of Friedel oscillations, which we argue might promote CDW formation via a self-amplifying process.

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