ELECTROSTATIC MECHANISM AND THEORY OF HIGH-Tc SUPERCONDUCTIVITY IN LAYERED MATERIALS

1989 ◽  
Vol 03 (03) ◽  
pp. 389-400 ◽  
Author(s):  
DANIEL C. MATTIS
Keyword(s):  
Charge Density ◽  
Density Of States ◽  
Carrier Density ◽  
Layered Materials ◽  
Charge Density Waves ◽  
High Tc ◽  
Energy Gaps ◽  
Quasiparticle Density ◽  
Viable Mechanism ◽  
Electrostatic Mechanism

Electrostatic forces among stacked metal planes provide a viable mechanism for high-T c superconductivity. Dimensionless parameters which involve interplanar separations, density-of-states, and carrier density, govern the outcome. Our mechanism favors holes over electrons, and works best in layered materials. We identify regions in parameter space where superconductivity is favored, and others where charge density waves are a possible outcome. We find a distribution of superconducting energy gaps, and obtain the resulting quasiparticle density-of-states.

scholarly journals d-Wave Superconductivity and s-Wave Charge Density Waves: Coexistence between Order Parameters of Different Origin and Symmetry

Symmetry ◽  
2011 ◽  
Vol 3 (4) ◽  
pp. 699-749 ◽  
Author(s):  
Toshikazu Ekino ◽  
Alexander M. Gabovich ◽  
Mai Suan Li ◽  
Marek Pękała ◽  
Henryk Szymczak ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Order Parameters ◽  
Density Waves ◽  
S Wave ◽  
High Tc ◽  
Energy Gaps ◽  
Theoretical Predictions ◽  
Different Origin ◽  
D Wave

A review of the theory describing the coexistence between d-wave superconductivity and s-wave charge-density-waves (CDWs) is presented. The CDW gapping is identified with pseudogapping observed in high-Tc oxides. According to the cuprate specificity, the analysis is carried out for the two-dimensional geometry of the Fermi surface (FS). Phase diagrams on the σ0 − α plane—here, σ0 is the ratio between the energy gaps in the parent pure CDW and superconducting states, and the quantity 2α is connected with the degree of dielectric (CDW) FS gapping—were obtained for various possible configurations of the order parameters in the momentum space. Relevant tunnel and photoemission experimental data for high-Tc oxides are compared with theoretical predictions. A brief review of the results obtained earlier for the coexistence between s-wave superconductivity and CDWs is also given.

scholarly journals Pair-density waves, charge-density waves, and vortices in high- Tc cuprates

2018 ◽  
Vol 97 (17) ◽  
Author(s):  
Zhehao Dai ◽  
Ya-Hui Zhang ◽  
T. Senthil ◽  
Patrick A. Lee
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Density Waves ◽  
High Tc ◽  
Pair Density ◽  
High Tc 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.

Quasiparticle density of states in high-Tc superconductors in the superconducting state

2007 ◽  
Vol 463-465 ◽  
pp. 123-125
Author(s):  
T. Hata ◽  
S. Onari ◽  
S. Honda ◽  
H. Itoh ◽  
Y. Tanaka ◽  
...  
Keyword(s):  
Density Of States ◽  
Superconducting State ◽  
High Tc Superconductors ◽  
High Tc ◽  
Quasiparticle Density

Photothermal microscope for high‐Tc superconductors and charge density waves

1993 ◽  
Vol 64 (11) ◽  
pp. 3321-3327 ◽  
Author(s):  
X. D. Wu ◽  
G. S. Kino ◽  
J. T. Fanton ◽  
A. Kapitulnik
Keyword(s):  
Charge Density ◽  
Charge Density Waves ◽  
Density Waves ◽  
High Tc Superconductors ◽  
High Tc

scholarly journals Competition of Superconductivity and Charge Density Waves in Cuprates: Recent Evidence and Interpretation

2010 ◽  
Vol 2010 ◽  
pp. 1-40 ◽  
Author(s):  
A. M. Gabovich ◽  
A. I. Voitenko ◽  
T. Ekino ◽  
Mai Suan Li ◽  
H. Szymczak ◽  
...  
Keyword(s):  
Charge Density ◽  
Input Parameter ◽  
Density Wave ◽  
Charge Density Waves ◽  
Cuprate Superconductivity ◽  
Coupling Approximation ◽  
Quasiparticle Density ◽  
Weak Coupling Approximation ◽  
Parameter Values ◽  
Control Quantity

Explicit and implicit experimental evidence for charge density wave (CDW) presence in high-Tcsuperconducting oxides is analyzed. The theory of CDW superconductors is presented. It is shown that the observed pseudogaps and dip-hump structures in tunnel and photoemission spectra are manifestations of the same CDW gapping of the quasiparticle density of states. Huge pseudogaps are transformed into modest dip-hump structures at low temperatures,T, when the electron spectrum superconducting gapping dominates. Heat capacity jumps at the superconducting critical temperature and the paramagnetic limit are calculated for CDW superconductors. For a certain range of parameters, the CDW state in ad-wave superconductor becomes reentrant withT, the main control quantity being a portion of dielectrcally gapped Fermi surface. It is shown that in the weak-coupling approximation, the ratio between the superconducting gap at zero temperatureΔ(T=0)andTchas the Bardeen-Cooper-Schrieffer value fors-wave Cooper pairing and exceeds the corresponding value ford-wave pairing of CDW superconductors. Thus, large experimentally found values2Δ(T=0)/Tc≈5÷8are easily reproduced with reasonable input parameter values of the model. The conclusion is made that CDWs play a significant role in cuprate superconductivity.

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