Sandwich Excitons as the Mechanism of High-TC Superconductivity

1989 ◽  
Vol 169 ◽  
Author(s):  
Brent A. Richert ◽  
Ewald Schachinger ◽  
Roland E. Allen
Keyword(s):  
Dielectric Constant ◽  
Large Energy ◽  
Matrix Elements ◽  
Pairing Mechanism ◽  
Model Calculations ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Transition Densities ◽  
Potential Objection ◽  
Energy Denominator

AbstractOne potential objection to virtual “sandwich excitons” as a pairing mechanism is that the transition densities may not be large enough to overcome the inherent disadvantage of a large energy denominator . In model calculations, we find that some of the transition densities and matrix elements can be large even if the dielectric constant is sizeable for, e.g., LaO excitons in La2‐xSrxCuO4

Mesoscopic Structures and Their Effects on High-Tc Superconductivity

2017 ◽  
Author(s):  
H. Zhang
Keyword(s):  
High Temperature ◽  
Rock Salt ◽  
High Temperature Superconductors ◽  
Structural Features ◽  
X Ray Diffraction ◽  
Model Calculations ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Electron Phonon Coupling ◽  
Structural Blocks

This article presents the results of model calculations carried out to determine the mesoscopic structural features of high-temperature superconducting (HTS) crystal structures, and especially their characteristic high critical temperature (Tc) and anisotropy. The crystal structure of high-temperature superconductors (HTSc) is unique in having some mesoscopic features. For example, the structures of a majority of cuprite superconductors are comprised of two structural blocks, perovskite and rock salt, stacked along the c-direction. This article calculates the interaction between the perovskite and rock salt blocks in the form of combinative energy in order to elucidate the effects of mesoscopic structures on high-Tc superconductivity. Both X-ray diffraction and Raman spectroscopy show that a ‘fixed triangle’ exists in the samples under investigation. The article also examines the importance of electron–phonon coupling in high-Tc superconductors.

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

The high-Tc superconductivity in SmxBa1−xCuO3−y compound system

1987 ◽  
Vol 63 (12) ◽  
pp. 1125-1128 ◽  
Author(s):  
Cao Ning ◽  
Duan Zhanguo ◽  
Shao Xiuyu ◽  
Zheng Jiaqi ◽  
Ran Qize ◽  
...  
Keyword(s):  
Compound System ◽  
High Tc ◽  
High Tc Superconductivity

High Tc superconductivity and crystal structure of Pb Sr Y,Ca Cu O system

1989 ◽  
Vol 162-164 ◽  
pp. 534-535 ◽  
Author(s):  
V.S. Melnikov ◽  
A.G. Popov ◽  
N.V. Dan'ko ◽  
N.P. Pshentsova ◽  
D.P. Demenko ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Tc ◽  
High Tc Superconductivity

Granular Aspects of High Tc Superconductivity

1990 ◽  
Vol 195 ◽  
Author(s):  
Guy Deutscher
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Original Publication ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Bulk Ceramic ◽  
Ceramic Samples ◽  
Granular Superconductors

ABSTRACTAs Bednorz and Muller noted in their original publication reporting on the discovery of high temperature superconductivity, their oxides present many of the features of granular superconductors. This behavior was first primarily ascribed to poor connectivity of the grains in the bulk ceramic samples. but later studies have pointed out to more fundamental reasons for these similarities. We will discuss them after first reviewing the well established properties of low Tc granular superconductors.

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