Study of non-Fermi Liquid behavior from partial nesting in multi-orbital superconductors

Abstract

Partial nesting between two connected or disconnected regions of the Fermi surface leads to fractional powers of the Coulomb scattering lifetime as a function of temperature and frequency. This result is first demonstrated for a toy band structure where partial nesting occurs within a single band and between different regions of the Brillouin zone. A comparison is then made to a multiband scenario by studying the scattering rate of an effective two orbital model that was proposed in the context of multi-orbital superconductors. In the process, various model independent factors affecting the temperature exponent, n, are identified. The logarithmically divergent contributions of the lowest order vertex correction to the multi-orbital susceptibility, and the role played by nesting in suppressing these divergences is analyzed. The relevance of these results is discussed keeping the recently observed anomalous resistivity in the Co doped Iron superconductor LiFeAs as a backdrop.

8 pages, 10 figures

References in corpus (8)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• A minimal two-band model for the superconducting Fe-pnictides
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with suppressed superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Anisotropic quasiparticle lifetimes in Fe-based superconductors

Cited by in corpus (1)

• Observation of non-Fermi liquid behavior in hole-doped LiFe${}_{1-x}$V${}_x$As