Electronic structure in one-Fe Brillouin zone of iron-pnictide superconductor CsFe${}_2$As${}_2$

Abstract

The multiband nature of iron-pnictide superconductors is one of the keys to the understanding of their intriguing behavior. The electronic and magnetic properties heavily rely on the multiband interactions between different electron and hole pockets near the Fermi level. At the fundamental level, though many theoretical models were constructed on the basis of the so-called 1-Fe Brillouin zone (BZ) with an emphasis of the basic square lattice of iron atoms, most electronic structure measurements were interpreted in the 2-Fe BZ. Whether the 1-Fe BZ is valid in a real system is still an open question. Using angle-resolved photoemission spectroscopy (ARPES), here we show in an extremely hole-doped iron-pnictide superconductor CsFe${}_2$As${}_2$ that the distribution of electronic spectral weight follows the 1-Fe BZ, and that the emerging band structure bears some features qualitatively different from theoretical band structures of the 1-Fe BZ. Our analysis suggests that the interlayer separation is an important tuning factor for the physics of FeAs layers, the increase of which can reduce the coupling between Fe and As and lead to the emergence of the electronic structure in accord with the 1-Fe symmetry of the Fe square lattice. Our finding puts strong constraints on the theoretical models constructed on the basis of the 1-Fe BZ.

References in corpus (14)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• A minimal two-band model for the superconducting Fe-pnictides
• Electronic structure of the iron-based superconductor LaOFeP
• Iron-based layered superconductor LaO${}_{1-x}$F${}_x$FeAs: an antiferromagnetic semimetal
• Spin fluctuations and superconductivity in a 3D tight-binding model for BaFe2As2
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• (pi,pi)-electronic order in iron arsenide superconductors
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Unfolding of the electronic structure through the induced representations of space groups: Application to Fe-based superconductors
• Glide-Plane Symmetry and Superconducting Gap Structure of Iron-Based Superconductors

Cited by in corpus (10)

• Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
• Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe2As2
• Evolution of quasiparticle excitations with critical mass enhancement in superconducting AFe2As2 (A = K, Rb, and Cs)
• Whether it is possible to stabilize the 1144-phase pnictides with tri-valence cations?
• Coexistence of localized and itinerant magnetism in intercalated iron-selenide (Li,Fe)OHFeSe
• Emergent spin-glass state in the doped Hund's metal CsFe2As2
• Vortex lattice and vortex bound states in CsFe${}_2$As${}_2$ investigated by scanning tunneling microscopy/spectroscopy
• Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor