Volume 92, Number 6, December 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.