English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Electrodynamic response of incoherent metals: Normal phase of iron pnictides

MPS-Authors
/persons/resource/persons126573

Craco,  L.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126729

Leoni,  S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126819

Rosner,  H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Laad, M. S., Craco, L., Leoni, S., & Rosner, H. (2009). Electrodynamic response of incoherent metals: Normal phase of iron pnictides. Physical Review B, 79: 024515, pp. 024515-1-024515-14. doi:10.1103/PhysRevB.79.024515.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-259A-B
Abstract
The recent discovery of high-temperature superconductivity in doped iron pnictides is the latest example of unanticipated behavior exhibited by d- and f-band materials. The symmetry of the superconductor (SC) gap, along with the mechanism of its emergence from the "normal" state, is a central issue in this context. Here, motivated by a host of experimental signatures suggesting strong correlations in the Fe pnictides, we undertake a detailed study of their normal state. Focusing on symmetry-unbroken phases, we use the correlated band-structure method, local density approximation plus dynamical mean-field theory (LDA+DMFT), to study the one-particle responses of both LaO1-xFeAsFx and SmO1-xFeAsFx in detail. Basing ourselves on excellent quantitative agreement between LDA+DMFT and key experiments probing the one-particle responses, we extend our study, undertaking the first detailed study of their normal-state electrodynamic response. In particular, we propose that near-total normal-state incoherence, resulting from strong, local correlations in the Fe d shell in Fe pnictides, underpins the incoherent normal-state transport found in these materials, and discuss the specific electronic mechanisms leading to such behavior. We also discuss the implications of our work for the multiband nature of the SC by studying the pairing "glue" function, which we find to be an overdamped electronic continuum. Similarities and differences between cuprates and Fe pnictides are also touched upon. Our study supports the view that SC in Fe pnictides arises from a bad-metallic incoherent "normal" state that is proximate to a Mott insulator.