LOCAL POLARIZATION, ELECTRON STRIPE, AND HIGH-Tc SUPERCONDUCTIVITY IN LAYERED CUPRATES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3536-3541 ◽  
Author(s):  
S. Kuwata
Keyword(s):  
Electronic State ◽  
Elementary Excitation ◽  
Translation Invariance ◽  
Coupling Constant ◽  
High Tc ◽  
Stripe Phase ◽  
High Tc Superconductivity ◽  
Local Polarization ◽  
Charge Oscillation ◽  
Layered Cuprates

We examine the possibility of high-Tc superconductivity mediated by the elementary excitation of an electron stripe which is realized by neutralizing local polarization mainly caused by the c-displacement of ions on the CuO 2 plane. Under the translation invariance of the electronic state of the neutralization charges, it is found that both itinerant and localized electrons and/or holes can coexist in the stripe phase. If the frequency of the localized charge oscillation tends to soften along the stripe direction, superconductivity with Tc around 100 K can be realized, due to the enhancement of the coupling constant.

scholarly journals Electronic State and Mechanism of High Tc Superconductivity.

Materia Japan ◽  
1995 ◽  
Vol 34 (12) ◽  
pp. 1354-1357
Author(s):  
Sadamichi Maekawa
Keyword(s):  
Electronic State ◽  
High Tc ◽  
High Tc Superconductivity

Uniform mixing of high-Tc superconductivity and antiferromagnetism on a single CuO2 plane in five-layered cuprates

2007 ◽  
Vol 460-462 ◽  
pp. 36-39 ◽  
Author(s):  
H. Mukuda ◽  
M. Abe ◽  
Y. Kitaoka ◽  
H. Kotegawa ◽  
K. Tokiwa ◽  
...  
Keyword(s):  
Cuo2 Plane ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Layered Cuprates

A NEW MECHANISM OF HIGH Tc SUPERCONDUCTIVITY BY ANTIFERROMAGNETIC SPIN WAVES

1987 ◽  
Vol 01 (07n08) ◽  
pp. 315-321 ◽  
Author(s):  
KIYOSHI SOGO
Keyword(s):  
Critical Temperature ◽  
Spin Wave ◽  
Spin Waves ◽  
Coupling Constant ◽  
High Critical Temperature ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Mechanism Of Superconductivity ◽  
Antiferromagnetic Spin

New mechanism of superconductivity is presented, which utilizes antiferromagnetic spin waves. It is found that for the case of Ising like anisotropy the spin wave coherence strongly enhances the superconductive coupling constant, which gives rise to a rather high critical temperature. Sloppy spin wave mechanism is also suggested.

scholarly journals Triplet hole propagation and high Tc superconductivity

1991 ◽  
Vol 185-189 ◽  
pp. 1603-1604
Author(s):  
A.M. Oleś ◽  
J. Zaanen ◽  
P. Horsch
Keyword(s):  
High Tc ◽  
High Tc Superconductivity

scholarly journals Novel Electronic State and Superconductivity in the Electron-Doped High-Tc T’-Superconductors

2017 ◽  
Vol 2 (3) ◽  
pp. 23 ◽  
Author(s):  
Tadashi Adachi ◽  
Takayuki Kawamata ◽  
Yoji Koike
Keyword(s):  
Electronic State ◽  
High Tc

ENERGY BAND OVERLAPPING IN HIGH-Tc SUPERCONDUCTORS

1996 ◽  
Vol 10 (30) ◽  
pp. 1483-1490 ◽  
Author(s):  
M. MORENO ◽  
R. M. MÉNDEZ-MORENO ◽  
M. A. ORTIZ ◽  
S. OROZCO
Keyword(s):  
Weak Coupling ◽  
Cuprate Superconductors ◽  
Weak Coupling Limit ◽  
Band Model ◽  
Coupling Constant ◽  
High Tc Superconductors ◽  
Energy Bands ◽  
Effective Coupling ◽  
High Tc ◽  
Two Band Model

Multi-band superconductors are analyzed and the relevance of overlapping energy bands to the high-T c of these materials is studied. Within the BCS framework, a two band model with generalized Fermi surface topologies is developed. Values of the overlapped occupancy parameters for typical cuprate superconductors are obtained as a function of the ratio R and the effective coupling constant, λ, in the weak-coupling limit. The overlap scale is of the order or lower than the cutoff (Debye) energy. The typical behavior of the isotope effect is obtained. As these superconductors have transition temperatures above the phonon barrier, the results of this approach are important to the generic understanding of the high-T c superconducting mechanism.

scholarly journals EFFECTS OF c-AXIS HOPPING IN THE INTERLAYER TUNNELING MODEL OF HIGH-Tc LAYERED CUPRATES

1999 ◽  
Vol 13 (13) ◽  
pp. 1619-1632
Author(s):  
BIPLAB CHATTOPADHYAY ◽  
A. N. DAS
Keyword(s):  
Experimental Data ◽  
Transition Temperature ◽  
Cuprate Superconductors ◽  
Interlayer Coupling ◽  
Superconducting Gap ◽  
Tunneling Model ◽  
High Tc ◽  
Optimal Doping ◽  
Pair Tunneling ◽  
Layered Cuprates

We consider the interlayer pair-tunneling model for layered cuprates, including an effective single particle hopping along the c-axis. A phenomenological suppression of the c-axis hopping matrix element, by the pseudogap in cuprate superconductors, is incorporated. At optimal doping, quantities characteristic to the superconducting state, such as the transition temperature and the superconducting gap are calculated. Results from our calculations are consistent with the experimental observations with the noteworthy point that, the superconducting gap as a function of temperature shows excellent match to the experimental data. Predictions within the model, regarding T c variation with interlayer coupling, are natural outcomes which could be tested further.

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