Low Temperature Physics: 40, 113 (2014); https://doi.org/10.1063/1.4865557
Физика Низких Температур: Том 40, Выпуск 2 (Февраль 2014), c. 148-159    ( к оглавлению , назад )

Antiferromagnetism and its origin in iron-based superconductors (Review Article)

Ming-Cui Ding1, Hai-Qing Lin2, and Yu-Zhong Zhang1

1Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, P.R. China
E-mail: yzzhang@tongji.edu.cn

2Beijing Computational Science Research Center, Beijing 100084, China

Received August 26, 2013


In iron-based superconductors, unravelling the origin of the antiferromagnetism is a crucial step towards understanding the high-Tc superconductivity as it is widely believed that the magnetic fluctuations play important roles in the formation of the Cooper pairs. Therefore, in this paper, we will briefly review experimental results related to the antiferromagnetic state in iron-based superconductors and focus on a review of the theoretical investigations which show applicability of the itinerant scenario to the observed antiferromagnetism and corresponding phase transitions in various families of the iron-based superconductors. A proposal of coupling between frustrated and unfrustrated bands for understanding the reduced magnetic moment typically observed in iron pnictides is also reviewed. While all the above theoretical investigations do not rule out a possible existence of localized electrons in iron-based superconductors, these results strongly indicate a close relation between itinerant electrons and the magnetically ordered state and point out the importance of taking into account the orbital degrees of freedom.

PACS: 74.70.Xa Pnictides and chalcogenides;
PACS: 75.10.–b General theory and models of magnetic ordering;
PACS: 71.20.–b Electron density of states and band structure of crystalline solids;
PACS: 71.10.Fd Lattice fermion models (Hubbard model, etc.).

Key words: high-Tc superconductivity, iron-based superconductors, bicollinear antiferromagnetism.