Physics picture from neutron scattering study on Fe-based superconductors

doi:10.1088/1674-1056/22/8/087405

Abstract Neutron scattering, with its ability to measure the crystal structure, the magnetic order, and the structural and magnetic excitations, plays an active role in investigating various families of Fe-based high-T_c superconductors. Three different types of antiferromagnetic orders have been discovered in the Fe plane, but two of them cannot be explained by the spin-densitywave (SDW) mechanism of nesting Fermi surfaces. Noticing the close relation between antiferromagnetic order and lattice distortion in orbital ordering from previous studies on manganites and other oxides, we have advocated orbital ordering as the underlying common mechanism for the structural and antiferromagnetic transitions in the 1111, 122, and 11 parent compounds. We observe the coexistence of antiferromagnetic order and superconductivity in the (Ba,K)Fe₂As₂ system, when its phase separation is generally accepted. Optimal T_c is proposed to be controlled by the local FeAs₄ tetrahedron from our investigation on the 1111 materials. The Bloch phase coherence of the Fermi liquid is found crucial to the occurrence of bulk superconductivity in iron chalcogenides of both the 11 and the 245 families. Iron chalcogenides carry a larger staggered magnetic moment (> 2 μ_B/Fe) than that in iron pnictides (< 1μ_B/Fe) in the antiferromagnetic order. Normal state magnetic excitations in the 11 superconductor are of the itinerant nature while in the 245 superconductor the spin-waves of localized moments. The observation of superconducting resonance peak provides a crucial piece of information in current deliberation of the pairing symmetry in Fe-based superconductors.

Keywords: orbital ordering antiferromagnetic order excitations structural transition

Received: 04 July 2013
Revised: 12 July 2013
Accepted manuscript online:

PACS:	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	74.70.-b	(Superconducting materials other than cuprates)
	78.70.Nx	(Neutron inelastic scattering)
	74.25.Jb	(Electronic structure (photoemission, etc.))

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921700 and 2011CBA00112) and the National Natural Science Foundation of China (Grant Nos. 11034012 and 11190024).

Corresponding Authors: Bao Wei
E-mail: wbao@ruc.edu.cn

Cite this article:

Bao Wei (鲍威) Physics picture from neutron scattering study on Fe-based superconductors 2013 Chin. Phys. B 22 087405

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