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- Title
Optical conductivity of nodal metals.
- Authors
Homes, C. C.; Tu, J. J.; Li, J.; Gu, G. D.; Akrap, A.
- Abstract
Fermi liquid theory is remarkably successful in describing the transport and optical properties of metals; at frequencies higher than the scattering rate, the optical conductivity adopts the well-known power law behavior σ1(∝) ω-2. We have observed an unusual non-Fermi liquid response σ1(ω) / ∝ ω -1±0.2 in the ground states of several cuprate and iron-based materials which undergo electronic or magnetic phase transitions resulting in dramatically reduced or nodal Fermi surfaces. The identification of an inverse (or fractional) power-law behavior in the residual optical conductivity now permits the removal of this contribution, revealing the direct transitions across the gap and allowing the nature of the electron-boson coupling to be probed. The non-Fermi liquid behavior in these systems may be the result of a common Fermi surface topology of Dirac cone-like features in the electronic dispersion.
- Subjects
OPTICAL conductivity; NODAL analysis; FERMI liquid theory; OPTICAL properties; CUPRATES; IRON; MAGNETIC transitions; FERMI energy
- Publication
Scientific Reports, 2013, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep03446