Microscopic origin of the linear temperature increase of the magnetic susceptibility of BaFe${}_2$As${}_2$

Abstract

Employing a combination of \emph{ab initio} band structure theory and dynamical mean-field theory we explain the experimentally observed linear temperature increase of the magnetic susceptibility of the iron pnictide material BaFe${}_2$As${}_2$. The microscopic origin of this anomalous behaviour is traced to a sharp peak in the spectral function located approximately 100 meV below the Fermi level. This peak is due to the weak dispersion of two-dimensional bands associated with the layered crystal structure of pnictides.

arXiv comment8 pages, 10 figures

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• Correlated electronic structure, orbital-dependent correlations, and Lifshitz transition in tetragonal FeS
• Anomalous metallic state in quasi-two-dimensional BaNiS${}_2$
• Electronic correlations, spectral and magnetic properties of ZrZn${}_2$
• Weak and strong electronic correlations in Fe superconductors
• Orbital-selective coherence-incoherence crossover and metal-insulator transition in Cu-doped NaFeAs
• Weakness of Correlation Effect Manifestation in BaNi${}_2$As${}_2$: ARPES and LDA+DMFT study
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides