Reproduction of experimental gap structure in LiFeAs based on orbital-spin fluctuation theory:s++-wave,s±-wave, and hole-s±-wave states

2014 ◽  
Vol 90 (3) ◽  
Author(s):  
Tetsuro Saito ◽  
Seiichiro Onari ◽  
Youichi Yamakawa ◽  
Hiroshi Kontani ◽  
Sergey V. Borisenko ◽  
...  
Keyword(s):  
Spin Fluctuation ◽  
S Wave ◽  
Wave States ◽  
Orbital Spin ◽  
Gap Structure

scholarly journals Elementary Particle Scattering Lengths and Resonances

1974 ◽  
Vol 27 (1) ◽  
pp. 13
Author(s):  
DC Peaslee
Keyword(s):  
Optical Potential ◽  
Scattering Length ◽  
Compound System ◽  
Zero Energy ◽  
S Wave ◽  
Nucleon System ◽  
Level Shifts ◽  
Wave States ◽  
Scattering Lengths

An investigation is made of the relation between scattering lengths and resonances in a two-nucleon system. For resonances Eo near zero energy the usual determination of an effective optical potential in mesonic atoms is limited, and it is shown here that the scattering length can only be represented usefully as a sum over resonances of the compound system if the condition IEolDI ~ (PDo)! Is satisfied, where D is the average spacing of s-wave states, p the density of target nucleons and Do the Compton volume of the reduced system. This condition is seen to be valid for mr:, nK and KK interactions and these systems are considered in some detail. It is shown that knowledge of the level shifts of each of these examples can help resolve present uncertainties in associated boson structure.

scholarly journals Doping evolution of the gap structure and spin-fluctuation pairing in Ba(Fe1−xCox)2As2 superconductors

2019 ◽  
Vol 99 (5) ◽  
Author(s):  
A. E. Karakozov ◽  
M. V. Magnitskaya ◽  
L. S. Kadyrov ◽  
B. P. Gorshunov
Keyword(s):  
Spin Fluctuation ◽  
Gap Structure

scholarly journals Analysis of s-wave, p-wave and d-wave holographic superconductors in Hořava–Lifshitz gravity

2018 ◽  
Vol 33 (26) ◽  
pp. 1850147
Author(s):  
Kai Lin ◽  
Xiao-Mei Kuang ◽  
Wei-Liang Qian ◽  
Qiyuan Pan ◽  
A. B. Pavan
Keyword(s):  
Scalar Field ◽  
Optical Conductivity ◽  
Equations Of Motion ◽  
Einstein Gravity ◽  
P Wave ◽  
S Wave ◽  
Field Mass ◽  
Holographic Superconductors ◽  
Wave States ◽  
D Wave

In this work, the s-wave, p-wave and d-wave holographic superconductors in the Hořava–Lifshitz gravity are investigated in the probe limit. For this approach, it is shown that the equations of motion for different wave states in Einstein gravity can be written as a unified form, and condensates take place in all three cases. This scheme is then generalized to Hořava–Lifshitz gravity, and a unified equation for multiple holographic states is obtained. Furthermore, the properties of the condensation and the optical conductivity are studied numerically. It is found that, in the case of Hořava–Lifshitz gravity, it is always possible to find some particular parameters in the corresponding Einstein case where the condensation curves are identical. For fixed scalar field mass m, a nonvanishing [Formula: see text] makes the condensation easier than in Einstein gravity for s-wave superconductor. However, the p-wave and d-wave superconductors have T[Formula: see text] greater than the s-wave.

The S-wave states in the adiabatic approximation

1981 ◽  
Vol 183 (3) ◽  
pp. 435-444 ◽  
Author(s):  
Kuang-Ta Chao
Keyword(s):  
Adiabatic Approximation ◽  
S Wave ◽  
Wave States

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.

Ru NMR and NQR Studies in CeRu2

1996 ◽  
Vol 51 (5-6) ◽  
pp. 793-796 ◽  
Author(s):  
K. Ishida ◽  
H. Mukuda ◽  
Y. Kitaoka ◽  
K. Asayama ◽  
Y. Onuki
Keyword(s):  
Superconducting State ◽  
Spin Fluctuation ◽  
S Wave ◽  
Temperature Range ◽  
Al Substitution ◽  
Exponential Decrease ◽  
Strong Spin

Abstract We have carried out Ru NMR and NQR measurements in superconductor CeRu2 having Tc = 6.1 K in the temperature range of 1.3-30 K. From the 99Ru NMR in 10.2 T above Hc2 , T1T = const was found in the measured-T range, and the value of T1TK2 is almost the same as that in the uncorrelated Korringa relation, suggesting that there does not exist the strong spin fluctuation of Ru d-spins. The property of the superconducting state was investigated by using Ru NQR. We observed the Hebel-Slichter peak just below T c and the exponential decrease in 1/T1 indicating that this superconductivity has an ordinary s-wave character. The effect of Al substitution for Ru was also studied by NMR and NQR.

scholarly journals s-Wave Superconductivity from an Antiferromagnetic Spin-Fluctuation Model for Bilayer Materials

1995 ◽  
Vol 74 (12) ◽  
pp. 2303-2306 ◽  
Author(s):  
A. I. Liechtenstein ◽  
I. I. Mazin ◽  
O. K. Andersen
Keyword(s):  
Spin Fluctuation ◽  
S Wave ◽  
Antiferromagnetic Spin ◽  
Fluctuation Model
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