Doping evolution of itinerant magnetic excitations in Fe-based oxypnictides
| dc.creator | Korshunov, M. M. | |
| dc.creator | Eremin, I. | |
| dc.date | 2008-07-20 | |
| dc.date.accessioned | 2026-07-07T10:01:53Z | |
| dc.date.available | 2026-07-07T10:01:53Z | |
| dc.description | 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 $x \approx 0.04$ 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 Im$χ({\bf Q_{AFM}},ω)$ 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=800K. 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. | |
| dc.description | 5 pages, accepted in EPL | |
| dc.identifier | https://arxiv.org/abs/0807.3166 | |
| dc.identifier | http://arxiv.org/abs/0807.3166 | |
| dc.identifier | EPL 83, 67003 (2008) | |
| dc.identifier | doi:10.1209/0295-5075/83/67003 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/168784 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Doping evolution of itinerant magnetic excitations in Fe-based oxypnictides | |
| dc.type | text |