High-Temperature Spin-Fluctuation Resistivity inAlMn

1971 ◽  
Vol 27 (12) ◽  
pp. 805-808 ◽  
Author(s):  
E. Babić ◽  
R. Krsnik ◽  
B. Leontić ◽  
Z. Vučić ◽  
I. Zorić ◽  
...  
Keyword(s):  
High Temperature ◽  
Spin Fluctuation

OCCURRENCE OF SPIN-FLUCTUATION PAIRING IN HIGH-TEMPERATURE SUPERCONDUCTORS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3635-3641 ◽  
Author(s):  
Howard A. Blackstead ◽  
John D. Dow
Keyword(s):  
High Temperature ◽  
Cooper Pair ◽  
Spin Fluctuation ◽  
High Temperature Superconductors ◽  
Wave Pairing ◽  
D Wave

The definitive property of a spin-fluctuation d-wave-pairing superconductor is that cuprate-plane Cu-site Ni is a weaker Cooper-pair-breaker than Zn on the same site. None of the major high-temperature superconductors, except possibly YBa 2 Cu 3 O x, exhibits this property experimentally.

scholarly journals Unusual symmetries of the order parameter in cuprates

2020 ◽  
Vol 2 (4) ◽  
pp. 207-212
Author(s):  
Tran Van Luong ◽  
Nguyen Thi Ngoc Nu
Keyword(s):  
High Temperature ◽  
Order Parameter ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Spin Fluctuation ◽  
High Temperature Superconductors ◽  
Coulomb Repulsion ◽  
Bcs Theory ◽  
S Wave ◽  
Wave Symmetry

The BCS superconducting theory, introduced by J. Bardeen, L. Cooper and R. Schriffer in 1957, succeeded in describing and satis-factorily explaining the nature of superconductivity for low-temperature superconductors. However, the BCS theory cannot explain the properties of high-temperature superconductors, discovered by J. G. Bednorz and K. A. Müller in 1986. Although scientists have found a lot of new superconductors and their transition temperatures are constantly increasing, most high-temperature superconductors are found by experiment and so far no theory can fully explain their properties. Many previous studies have suggested that the order parameter in high-temperature copper-based superconductors (cuprate superconductors - cuprates) is in the form of d-wave symmetry, but recent results show that the order parameter has an extended s-wave symmetry (extended s wave). Studying the symmetric forms of order parameters in cuprate can contribute to understanding the nature of high-temperature superconductivity. In this article, the authors present an overview of the development of high-temperature supercon-ductors over the past 30 years and explains unusual symmetries of the order parameter in copper-based superconductors. The com-petition of three coupling mechanisms of electrons in cuprates (the mechanism of coupling through coulomb repulsion, electron-phonon mechanism and spin-fluctuation mechanism) affects the unusual symmetry of the order parameter. The solution of the self-consistency equation in simple cases has been found and the ability to move the phase within the superconducting state has been shown.

Spin-fluctuation light scattering at high temperature

1974 ◽  
Vol 9 (7) ◽  
pp. 3044-3052 ◽  
Author(s):  
Peter M. Richards ◽  
W. J. Brya
Keyword(s):  
High Temperature ◽  
Light Scattering ◽  
Spin Fluctuation

Superconductivity in Octagraphene

2021 ◽  
Author(s):  
Jun Li ◽  
Dao-Xin Yao
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Electronic Band Structure ◽  
Spin Fluctuation ◽  
Electronic Band ◽  
New Family ◽  
Carbon Ring ◽  
Electron Phonon Coupling ◽  
Ring Structures ◽  
High Structural Stability

Abstract This article reviews the basic theoretical aspects of octagraphene, an one-atom-thick allotrope of carbon, with unusual two-dimensional (2D) Fermi nesting, hoping to contribute to the new family of quantum materials. Octagraphene has an almost strongest sp 2 hybrid bond similar to graphene, and has the similar electronic band structure as iron-based superconductors, which makes it possible to realize high-temperature superconductivity. We have compared various possible mechanisms of superconductivity, including the unconventional s ± superconductivity based on spin fluctuation and conventional superconductivity based on electron-phonon coupling. Theoretical studies have shown that octagraphene has relatively high structural stability. Although many 2D carbon materials with C 4 carbon ring and C 8 carbon ring structures have been reported, it is still challenging to realize the octagraphene with pure square-octagon structure experimentally. This material holds hope to realize new 2D high-temperature superconductivity.

scholarly journals Superconductivity, Antiferromagnetism, and Kinetic Correlation in Strongly Correlated Electron Systems

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Takashi Yanagisawa
Keyword(s):  
High Temperature ◽  
Hubbard Model ◽  
High Temperature Superconductivity ◽  
Spin Fluctuation ◽  
Coulomb Repulsion ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
Antiferromagnetic Correlation ◽  
The Stability

We investigate the ground state of two-dimensional Hubbard model on the basis of the variational Monte Carlo method. We use wave functions that include kinetic correlation and doublon-holon correlation beyond the Gutzwiller ansatz. It is still not clear whether the Hubbard model accounts for high-temperature superconductivity. The antiferromagnetic correlation plays a key role in the study of pairing mechanism because the superconductive phase exists usually close to the antiferromagnetic phase. We investigate the stability of the antiferromagnetic state when holes are doped as a function of the Coulomb repulsionU. We show that the antiferromagnetic correlation is suppressed asUis increased exceeding the bandwidth. High-temperature superconductivity is possible in this region with enhanced antiferromagnetic spin fluctuation and pairing interaction.

Challenges Confronting High Temperature Superconducting Materials: From Nanoscale Theories to Exascale Energy Applications

2014 ◽  
Vol 1684 ◽  
Author(s):  
Paul Michael Grant
Keyword(s):  
High Temperature ◽  
Density Functional ◽  
High Temperature Superconductor ◽  
Spin Fluctuation ◽  
Lattice Vibration ◽  
Energy Scale ◽  
Long Distance ◽  
Functional Theory ◽  
Energy Applications ◽  
Natural Gas Pipeline

ABSTRACTWe review the present state of the understanding and application of high temperature superconductor materials ranging from attempts to clarify pairing mechanisms on the energy scale of a few milli-electron-volts to their use to embody terra-kwh continental wide deployment within the electricity enterprise. Examples include the use of density functional theory to study the relative roles of spin-fluctuation and/or lattice vibration induced Cooper pairing to modelling the incorporation of long distance HTSC transmission cables within the same natural gas pipeline rights-of-way infrastructure now emerging worldwide.

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