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

scholarly journals MECHANISM OF HIGH-Tc SUPERCONDUCTIVITY BASED MAINLY ON TUNNELING MEASUREMENTS IN CUPRATES

2005 ◽  
Vol 19 (16) ◽  
pp. 743-770 ◽  
Author(s):  
A. MOURACHKINE
Keyword(s):  
Tunneling Spectroscopy ◽  
Phase Coherence ◽  
Spin Fluctuations ◽  
Cooper Pairs ◽  
High Tc ◽  
High Tc Superconductivity ◽  
One Dimensional ◽  
Topological Excitations ◽  
Discrete Breathers

The main purpose of this brief review is to present a sketch of the mechanism of high-Tc superconductivity based mainly on tunneling measurements in cuprates. In the review, we shall mostly discuss tunneling spectroscopy in Bi 2 Sr 2 CaCu 2 O 8. Analysis of the data shows that the Cooper pairs in cuprates are topological excitations (e.g. quasi-one-dimensional bisolitons, discrete breathers etc.), and the phase coherence among the Cooper pairs appears due to spin fluctuations.

THEORY FOR INELASTIC NEUTRON SCATTERING IN HIGH-Tc SUPERCONDUCTORS: DOPING AND TEMPERATURE DEPENDENCE OF TWO CHARACTERISTIC FREQUENCIES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3451-3456
Author(s):  
I. EREMIN ◽  
D. MANSKE ◽  
C. JOAS ◽  
K. H. BENNEMANN
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Spin Fluctuations ◽  
High Tc Superconductors ◽  
High Tc ◽  
Doping Dependence ◽  
Antiferromagnetic Spin ◽  
Coherence Effect

Assuming the exchange of antiferromagnetic spin fluctuations as the Cooper pairing mechanism we calculate the doping dependence of the resonance peak seen in inelastic neutron scattering and the magnetic coherence effect. We find that the resonance peak in the magnetic susceptibility, Im χ(q,ω), appears only in the superconducting state at ωres and that it scales with Tc. Magnetic coherence is a result of an interplay between a d-wave order parameter and the kinematic gap ω0. We analyze the structure of Im χ below Tc, the doping dependence of ω0 and ωres, and the consequences for the optical conductivity.

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.

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