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Abstract

High- T _ccuprates, iron-based superconductors, heavy-fermion superconductors and κ-type layered organic superconductors share some common features − the proximity of the superconducting state to the magnetic ordered state and the non- s-wave superconducting pairing function. It is generally believed that the Cooper pairings in these unconventional superconductors are mediated by spin fluctuations. In this paper, we present a brief overview on the spin dynamics and unconventional pairing, focusing on high- T _ccuprates and iron-based superconductors. In particular, we will overview the properties of the neutron spin resonance and its possible origin, the pairing mechanism in Hubbard model within the weak-coupling framework and its application to the aforesaid unconventional superconductors. We point out that the interplay between magnetism and superconductivity is still an area of active research.

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Authors and contacts

Li Jian-Xin^1,2

Corresponding author:Li Jian-Xin,jxli@nju.edu.cn

Funds:Project supported by the National Basic Research Program of China (Grant No. 2016YFA0300401) and the National Natural Science Foundation of China (Grant No. 11774152)

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Vol. 70, Issue 1 - 2021-01-05

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