| Issue |
EPL
Volume 92, Number 6, December 2010
|
|
|---|---|---|
| Article Number | 67003 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/92/67003 | |
| Published online | 17 January 2011 | |
Comparative study of tetragonal and hexagonal FeSe: An orbital-selective scenario
Technische Universität Dresden, Institut für Physikalische Chemie und Elektrochemie - 01062 Dresden, Germany, EU
Received:
3
September
2010
Accepted:
1
December
2010
In order to explore the reason why the hexagonal phase of FeSe is insulating, in contrast with tetragonal FeSe which is superconducting, we study a model that incorporates all orbitals of the Iron d-shell. It is found, within the local-density approximation plus dynamical mean-field theory (LDA+DMFT) that hexagonal FeSe resembles an orbital-selective insulating state. Basing ourselves on the good semiquantitative accord with a range of experimental data for tetragonal-FeSe superconductor, we show the intrinsic nature of the pseudogap state in these chalcogenide systems leading to an orbital-selective violation of the Landau–Fermi-liquid description at low temperatures. We discuss the pseudogap regime microscopically, along with the nature of the insulating state of hexagonal FeSe.
PACS: 74.70.-b – Superconducting materials other than cuprates / 72.15.-v – Electronic conduction in metals and alloys / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2010
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