2008/07/20 by M. M. Korshunov, Ilya Eremin, I. Eremin · 4 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Context (archaeology) #Corporate Taxation and Avoidance #Doping #Fermi surface #Iron-based superconductors research #Pauli exclusion principle #Physics #Physics of Superconductivity and Magnetism #Spin (aerodynamics) #Spin density wave #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/83/67003
published as EPL 83, 67003 (2008) · 5 pages, accepted in EPL
arxiv created 2008/07/20 · openalex publication_date 2008/09/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Employing the four-band tight-binding model, we study theoretically the doping dependence of the spin response in the normal state of novel Fe-based pnictide superconductors. We show that the commensurate spin density wave (SDW) transition that arises due to interband scattering between the hole α-pockets and the electron β-pockets disappears already at the doping concentration x ≈0.04 reflecting the evolution of the Fermi surfaces. Correspondingly, with further increase of the doping the antiferromagnetic fluctuations are suppressed for x >0.1 and the imaginary part of the spin susceptibility at antiferromagnetic wave vector becomes nearly temperature independent. At the same time, we observe that the uniform susceptibility deviates from the Pauli-like behavior and is increasing with increasing temperature reflecting the activation processes for the α-Fermi surfaces up to temperatures of about T =800 K. With increase of the doping the absolute value of the uniform susceptibility lowers and its temperature dependence changes. In particular, it is a constant at low temperatures and then decreases with increasing temperature. We discuss our results in a context of recent experimental data.