Seminars & Lectures
| * TITLE | Investigation of the role of spin-orbit coupling on the transport properties of Iron-based superconducting materials | ||||||
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| * DATE / TIME | 2011-10-28, 2:00 pm | ||||||
| * PLACE | 503 Seminar Room | ||||||
| * ABSTRACT | |||||||
| Currently under intense investigation in context of their magnetic and superconducting properties, a generic feature associated with the electronic structure of the recently discovered iron-based materials is that the 3d orbitals of Fe make dominant contribution to density of states near the Fermi level. Therefore, the transport properties of these materials can naturally be expected to be governed by these 3d electrons. Incorporating several realistic electronic features in a multi-orbital tight-binding (TB)model, where TB parameters are obtained by fitting the band structure obtained within the density functional theory, we investigate the role of spin-orbit coupling associated with the Fe-3d orbitals on the transport properties of these materials. Our investigation highlights the importance of certain characteristic features associated with the electronic band, such as several band crossings and Dirac cone etc., that arise as a consequence of the various crystal symmetries. We find a significantly large spin Hall conductivity in the paramagnetic state that is comparable with its counterpart in Pt despite . We also find finite anomalous Hall conductivity in the ferromagnetic state. |
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