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.

A Self-Doped Oxygen-Free High-Critical-Temperature (High-Tc) Superconductor: SmFFeAs

2019 ◽  
Vol 58 (22) ◽  
pp. 15401-15409 ◽  
Author(s):  
Dan Lin ◽  
Han-Shu Xu ◽  
Jingjing Luo ◽  
Haoliang Huang ◽  
Yalin Lu ◽  
...  
Keyword(s):  
Critical Temperature ◽  
High Critical Temperature ◽  
High Tc ◽  
High Tc Superconductor

Reconsideration of the Doping Effect on High-Tc Superconductivity

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3023-3026
Author(s):  
De-Hua Lin ◽  
Xingang Wu
Keyword(s):  
Crystal Structure ◽  
Nuclear Spin ◽  
Fermi Liquid ◽  
Three Dimensional ◽  
Interlayer Spacing ◽  
Doping Effect ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Mechanism Of Superconductivity

Studying the change of the cuprate's crystal structure based on doping and then the effect on its high-T c superconductivity, is an effective way to seek the mechanism of superconductivity. We explore the doping effect in the cuprate's crystal structure, such as the property of Cu-O layers, the interlayer spacing, the density of carriers and so on. Then, by considering the effect of the nuclear spin, we construct a three-dimensional superconductivity model, which is a correction of the nonphonon mechanism in a layered Fermi-Liquid.

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.

Antiferromagnetic spin fluctuations and high-TC superconductivity

1992 ◽  
Vol 53 (12) ◽  
pp. 1515-1521 ◽  
Author(s):  
Kazuo Ueda ◽  
Tôru Moriya ◽  
Yoshinori Takahashi
Keyword(s):  
Spin Fluctuations ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Antiferromagnetic Spin

ON THE INFLUENCE OF POSSIBLE MECHANISM OF INTERPLANE INTERACTION ON HIGH Tc

1989 ◽  
Vol 03 (16) ◽  
pp. 1237-1240
Author(s):  
J. SOSNOWSKI
Keyword(s):  
Critical Temperature ◽  
Coupling Constant ◽  
High Tc ◽  
Ceramic Samples

The possible influence of attractive interplane interaction on the critical temperature of high T c ceramics is considered. The influence of the number of interacting planes, what roughly may correspond to the yttrium based and bismuth ceramic samples is investigated. The results indicate that even for relatively weak interplane coupling constant high T c connected with this interaction may be reached for appropriate spectrum of excitations.

ON PHONON MECHANISM OF HIGH TC SUPERCONDUCTIVITY

1988 ◽  
Vol 02 (05) ◽  
pp. 867-872 ◽  
Author(s):  
Fu-sui Liu ◽  
X. Q. Wang ◽  
P. Mangkorntong
Keyword(s):  
Isotope Effect ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Phonon Mechanism ◽  
Mechanism Of Superconductivity

This paper explains simultaneously dTc/dP > 0, dλ/dP < 0 and the isotope effect observed for Y1Ba2Cu3O6.9 and La1.85Sr0.75CuO4 in terms of unified parameters in phonon mechanism of superconductivity.

scholarly journals Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

2021 ◽  
Vol 9 ◽  
Author(s):  
S. H. Guan ◽  
Y. Yang ◽  
Z. Jin ◽  
T. T. Liu ◽  
Y. Liu ◽  
...  
Keyword(s):  
Spin Wave ◽  
Spin Waves ◽  
Memory Device ◽  
Device Design ◽  
Circularly Polarized ◽  
Intersection Line ◽  
Antiferromagnetic Spin ◽  
Opposite Chirality

An investigation of spin waves interacting with antiferromagnetic spin textures is meaningful for future spintronic and magnonic-based memory and logic applications. In this work, we numerically study the skyrmion dynamics driven by circularly polarized spin waves in antiferromagnets and propose a method of suppressing the Hall motion. It is demonstrated that the application of two circularly polarized spin waves with opposite chirality allows the skyrmion motion straightly along the intersection line of the two spin wave sources. The skyrmion speed depending on these parameters of the spin waves and system is estimated, and a comparison with other methods is provided. Furthermore, two depinning behaviors of the skyrmion related to the strengths of the defect are also observed in the simulations. Thus, the proposed method could be used in precisely modulating the skyrmion dynamics, contributing to skyrmion-based memory device design.

Theoretical aspects of magnon–magnon interactions in Heisenberg ferromagnets

1987 ◽  
Vol 65 (10) ◽  
pp. 1272-1279 ◽  
Author(s):  
P. D. Loly
Keyword(s):  
Low Temperature ◽  
Spin Wave ◽  
Low Temperatures ◽  
Theoretical Foundation ◽  
Weak Interactions ◽  
Spin Waves ◽  
Wave Interactions ◽  
Experimental Activity ◽  
Close Proximity ◽  
Antiferromagnetic Spin

Spin-wave interactions in ferromagnetic insulators have a well-established theoretical foundation, in contrast to the situation for antiferromagnets. These interactions may be classified into two groups according to whether the dominant aspects are of one- or two-magnon character. The weak interactions between spin waves excited at low temperatures are responsible for the success of "free" (or noninteracting) spin-wave calculations in explaining low-temperature thermodynamic properties. In contrast, the two-magnon aspects appear in connection with two-magnon Raman scattering, where pairs of magnons are created in close proximity and consequently interact strongly. Parallels with analogous systems, especially antiferromagnetic spin waves and phonons, are noted in reviewing the ferromagnetic case. Emphasis is placed on the structure of the theory, rather than on the wealth of experimental activity.

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