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Quantum Criticality in the 122 Iron Pnictide Superconductors Emerging from Orbital-Selective Mottness
- Source :
- Phys. Rev. B 92, 155112 (2015)
- Publication Year :
- 2014
-
Abstract
- The twin issues of the nature of the normal state and competing order(s) in the iron arsenides are central to understanding their unconventional, high-Tc superconductivity. We use a combination of transport anisotropy measurements on detwinned Sr(Fe(1-x)Co(x))2As2 single crystals and local density approximation plus dynamical mean field theory (LDA + DMFT) calculations to revisit these issues. The peculiar resistivity anisotropy and its evolution with x are naturally interpreted in terms of an underlying orbital-selective Mott transition (OSMT) that gaps out the dxz or dyz states. Further, we use a Landau-Ginzburg approach using LDA + DMFT input to rationalize a wide range of anomalies seen up to optimal doping, providing strong evidence for secondary electronic nematic order. These findings suggest that strong dynamical fluctuations linked to a marginal quantum-critical point associated with this OSMT and a secondary electronic nematic order constitute an intrinsically electronic pairing mechanism for superconductivity in Fe arsenides.<br />Comment: 9 pages, revtex4-1, published version
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 92, 155112 (2015)
- Publication Type :
- Report
- Accession number :
- edsarx.1412.1034
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.92.155112