Electronic structure of CaFe2As2

Abstract

We investigate the electronic structure of CaFe${}_2$As${}_2$ using high resolution photoemission spectroscopy. Experimental results exhibit three energy bands crossing the Fermi level making hole pockets around the $\Gamma$-point. Temperature variation reveal a gradual shift of an energy band away from the Fermi level with the decrease in temperature in addition to the spin density wave (SDW) transition induced Fermi surface reconstruction of the second energy band across SDW transition temperature. The hole pocket in the former case eventually disappears at lower temperatures while the hole Fermi surface of the third energy band possessing finite $p$ orbital character survives till the lowest temperature studied. These results reveal signature of a complex charge redistribution among various energy bands as a function of temperature that might be associated to the exotic properties of this system.

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Cited by in corpus (7)

• Tetragonal and collapsed-tetragonal phases of CaFe2As2 -- a view from angle-resolved photoemission and dynamical mean field theory
• Emergent electronic structure of CaFe2As2
• Hidden phase in parent Fe-pnictide superconductors
• Dimensionality, nematicity and Superconductivity in Fe-based systems
• Emergence of well screened states in a superconducting material of the CaFe${}_2$As${}_2$ family
• Orbital-dependent electron dynamics in Fe-pnictide superconductors
• Unusual role of ligand states in the electronic properties of a parent Fe-based superconductor, CaFe2As2