scholarly journals Planar hole-doping concentration and effective three-dimensional hole-doping concentration for single-layer high-Tc superconductors

2007 ◽  
Vol 460-462 ◽  
pp. 809-810
Author(s):  
Tatsuya Honma ◽  
Pei Herng Hor
Keyword(s):  
Doping Concentration ◽  
Three Dimensional ◽  
Single Layer ◽  
Hole Doping ◽  
High Tc Superconductors ◽  
High Tc

Effect of Disorder on Driven Vortex Matter in High-Tc Superconductors

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3433-3435
Author(s):  
Qing-Hu Chen ◽  
Xiao Hu
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Xy Model ◽  
Vortex Matter ◽  
High Tc Superconductors ◽  
High Tc ◽  
First Order Phase Transition ◽  
Effect Of Disorder ◽  
First Order Phase ◽  
Large Scale Simulations

We performed large-scale simulations in the current-driven three-dimensional frustrated anisotropic XY model in the presense of point-like defects with resistively-shunted junction dynamics. A moving Bragg (BrG) glass is observed applying the current in the equilibrium BrG state. The first-order phase transition from the moving BrG to the moving smectic is clarified. The effect of disorder become weak once the vortex matter is set in motion.

Pairing Interaction in the Hole-Doped High-Tc Superconductors

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2954-2957
Author(s):  
Sung-Ho Suck Salk
Keyword(s):  
Phase Diagram ◽  
Scattering Theory ◽  
Hole Doping ◽  
High Tc Superconductors ◽  
Pairing Interaction ◽  
High Tc ◽  
Positively Charged ◽  
Singlet Pair

A scenario for the possibility of hole-pairing is introduced on the basis of the phase diagram involving the spingap phase and the superconducting order for high-T c superconductors. Using our earlier generalized scattering theory, a theory of hole-pairing is proposed by allowing interaction between the negatively charged singlet pair and the positively charged holes as a result of hole doping.

scholarly journals Character of Doped Holes in Nd1−xSrxNiO2

2021 ◽  
Vol 6 (3) ◽  
pp. 33
Author(s):  
Tharathep Plienbumrung ◽  
Michael Thobias Schmid ◽  
Maria Daghofer ◽  
Andrzej M. Oleś
Keyword(s):  
Rare Earth ◽  
Charge Transfer ◽  
Charge Distribution ◽  
Hole Doping ◽  
Band Model ◽  
High Tc Superconductors ◽  
Transfer Energy ◽  
High Tc ◽  
Charge Transfer Energy ◽  
Two Band Model

We investigate charge distribution in the recently discovered high-Tc superconductors, layered nickelates. With increasing value of charge-transfer energy, we observe the expected crossover from the cuprate to the local triplet regime upon hole doping. We find that the d−p Coulomb interaction Udp makes Zhang-Rice singlets less favorable, while the amplitude of local triplets at Ni ions is enhanced. By investigating the effective two-band model with orbitals of x2−y2 and s symmetries we show that antiferromagnetic interactions dominate for electron doping. The screened interactions for the s band suggest the importance of rare-earth atoms in superconducting nickelates.

scholarly journals Polarons in axial transport in single-layer high-Tc superconductors

Open Physics ◽  
2004 ◽  
Vol 2 (2) ◽  
Author(s):  
Alexander Andreev ◽  
Stefka Tsintsarska ◽  
Maria Dimitrova-Ivanovich ◽  
Ivaylo Polyanski ◽  
Mladen Georgiev ◽  
...  
Keyword(s):  
Normal State ◽  
Single Layer ◽  
Zero Point ◽  
High Tc Superconductors ◽  
Free Hole ◽  
High Tc ◽  
Thermally Activated ◽  
Field Coupling ◽  
Carrier Scattering ◽  
Good Agreement

AbstractThe temperatureT dependencies ρ(T) of normal state electric resistivitiesρ c (axial) andρ ab (in plane) of single-layer high-T c superconductors show common trends: AsT is raised, the resistivity first drops steeply before it starts rising αT above an apparent semiconductor-to-metal crossoverT cross. To analyze ρ(T) we plottT/ρ againstT at various dopingsx for bothρ c andρ ab.T/ρ is inversely proportional to the traversal time across a potential barrier as an ionic particle drifts in an electric field. We findT/ρ in good agreement with theT dependence of the quantum rate of migrating particles: AsT is raised, a zero-point rate at the lowestT is extended to a nearly flat plateau before a thermally activated branch sets in. We also find evidence for the admixture of 1- & 2-phonon absorptions below the Arrhenius range. These features shape the semiconductor-like branch below Tcross. AboveT cross a metallic-like branch sets in, its αT character deriving from the field coupling of the migrating particle. Our analysis suggests that metal physics may not suffice if ionic features play a role in transport. We attribute our conclusions to the drift of strong-coupling polarons along Cu−O bonds. These “bond polarons” originate from carrier scattering by double-well potentials associated with the bonds. A bond polaron dissociates to a free hole as it passes onto a neighboring O-O link.

Doping Dependence of Bose Condensation Energy in High Tc Cuprates

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3231-3235
Author(s):  
Sung-Sik Lee ◽  
Sung-Ho Suck Salk
Keyword(s):  
Degrees Of Freedom ◽  
Doping Concentration ◽  
Bose Condensation ◽  
Hole Doping ◽  
Condensation Energy ◽  
Spin Gap ◽  
High Tc ◽  
Doping Dependence ◽  
Boson Theory ◽  
High Tc Cuprates

The doping dependence of the bose condensation energy is investigated by using our SU (2) holon-pair boson theory. It is shown that the bose condensation energy U results from the interplay between the charge and spin degrees of freedom and that the doping dependence of U at T=0K is well fit by the relation, [Formula: see text] with Δ0, the spin gap at 0K; x, the hole doping concentration and α, a constant.

A GINZBURG-LANDAU THEORY FOR CRITICAL TEMPERATURE OF LAYERED HIGH-Tc SUPERCONDUCTORS

1989 ◽  
Vol 03 (18) ◽  
pp. 1393-1400
Author(s):  
TATSUYA NAGAO ◽  
HIROYUKI MORI ◽  
FUMIKO YONEZAWA
Keyword(s):  
Experimental Data ◽  
Critical Temperature ◽  
Layered Structure ◽  
Phenomenological Model ◽  
Landau Theory ◽  
Single Layer ◽  
High Tc Superconductors ◽  
Ginzburg Landau ◽  
High Tc ◽  
Periodic Layered Structure

Using a phenomenological model for layered superconductors, we derive a formalism for the critical temperature T c in terms of the layer numbers. We show that T c of a system of n identical layers is the same as that of a single layer for all values of n. In a periodic layered structure composed of two kinds of layers, T c increases monotonically with the number of higher-T c layers. When the carrier number depends on structure, T c shows a behavior consistent with the experimental data on some high-T c superconductors such as Tl and Bi families. We make a suggestion to achieve a higher T c .

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