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  Electrodynamic response of incoherent metals: Normal phase of iron pnictides

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-259A-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F4E2-9
Genre: Journal Article

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 Creators:
Laad, M. S., Author
Craco, L.1, Author              
Leoni, S.1, Author              
Rosner, H.2, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863450              

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Free keywords: band structure; doping; electrodynamics; high-temperature superconductors; iron compounds; lanthanum compounds; localised states; oxygen compounds; samarium compounds
 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.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 404369
ISI: 000262978100092
DOI: 10.1103/PhysRevB.79.024515
 Degree: -

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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Pages: - Volume / Issue: 79 Sequence Number: 024515 Start / End Page: 024515-1 - 024515-14 Identifier: ISSN: 1098-0121