Volume 109, Number 1, January 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 January 2015|
Effective three-band structure in Fe-based superconductors
Instituto de Física da Universidade Federal Fluminense - CEP 24.210-346, Niterói, RJ, Brazil
Received: 10 November 2014
Accepted: 23 December 2014
We present self-consistent calculations of the multi-gap structure measured in some Fe-based superconductors. These materials are known to have structural disorder in real space and a multi-gap structure due to the 3d Fe orbitals contributing to a complex Fermi surface topology with hole and electron pockets. Different experiments identify three s-wave–like superconducting gaps with a single critical temperature $(T_c)$ . We investigate the temperature dependence of these gaps by a multi-band Bogoliubov-de Gennes theory at different pockets in the presence of effective hybridizations between some bands and an attractive temperature-dependent intra-band interaction. We show that this approach reproduces the three observed gaps and single Tc in different compounds of Ba1−xKxFe2As2, providing some insights into the inter-band interactions.
PACS: 74.70.Xa – Pnictides and chalcogenides / 74.20.Mn – Nonconventional mechanisms / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© EPLA, 2015
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.