Antiferromagnetic spin fluctuations and superconductivity in high-Tc oxides

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.

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Antiferromagnetic Spin Fluctuations Enhancing Superconducting Transition Temperature in LaFeAsO-Based High-Tc Superconductors

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013) ◽

10.7566/jpscp.3.015038 ◽

2014 ◽

Author(s):

H. Mukuda ◽

K. Yamamoto ◽

K. T. Lai ◽

F. Engetsu ◽

M. Yashima ◽

...

Keyword(s):

Transition Temperature ◽

Superconducting Transition Temperature ◽

Spin Fluctuations ◽

Superconducting Transition ◽

High Tc Superconductors ◽

High Tc ◽

Antiferromagnetic Spin

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Local-moment antiferromagnetic spin fluctuations and the normal- state properties of high-Tc cuprates

Physica C Superconductivity ◽

10.1016/0921-4534(94)90607-6 ◽

1994 ◽

Vol 224 (1-2) ◽

pp. 75-78

Author(s):

Wei Lu ◽

Chang-De Gong

Keyword(s):

Normal State ◽

Spin Fluctuations ◽

Local Moment ◽

High Tc ◽

Normal State Properties ◽

Antiferromagnetic Spin ◽

High Tc Cuprates

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NQR and NMR in High Tc Superconductors

Zeitschrift für Naturforschung A ◽

10.1515/zna-1992-1-204 ◽

1992 ◽

Vol 47 (1-2) ◽

pp. 7-11 ◽

Cited By ~ 5

Author(s):

K. Asayama ◽

Y. Kitaoka ◽

G.-q. Zheng

Keyword(s):

High Temperature ◽

Transition Temperature ◽

Low Temperature ◽

Spin Fluctuations ◽

Superconducting Transition ◽

High Tc Superconductors ◽

High Tc ◽

Pairing Correlations ◽

Antiferromagnetic Spin ◽

D Wave

AbstractRecent NQR and NMR experiments on La2-xSrxCuO4 , YBa2Cu3O7 , Tl2Ba2CuO6+y , and other compounds are reviewed. The antiferromagnetic spin fluctuations decrease in the order of La, Y, T1 compounds. In the normal state the T-dependence of (T1T)-1 is considered to follow the Curie- Weiss law at high temperature and the (Ti 7") = const law at low temperature. The T dependence of 1/T1 below Tc suggests strongly d-wave pairing. Correlations of the NQR frequency of 63Cu and 17O with the antiferromagnetic spin fluctuations and the superconducting transition temperature are discussed.

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