Pseudogap formation of four-layer BaRuO${}_3$ and its electrodynamic response changes

Abstract

We investiaged the optical properties of four-layer BaRuO${}_3$, which shows a fermi-liquid-like behavior at low temperature. Its optical conductivity spectra clearly displayed the formation of a pseudogap and the development of a coherent peak with decreasing temperature. Temperature-dependences of the density $n$ and the scattering rate $1/\tau$ of the coherent component were also derived. As the temperature decreases, both $n$ and $1/\tau$ decrease for four-layer BaRuO${}_3$. These electrodynamic responses were compared with those of nine-layer BaRuO${}_3$, which also shows a pseudogap formation but has an insulator-like state at low temperature. It was found that the relative rates of change of both $n$ and $1/\tau$ determine either metallic or insulator-like responses in the ruthenates. The optical properties of the four-layer ruthenate were also compared with those of other pseudogap systems, such as high $T_c$ cuprates and heavy electron systems.

7 figures. submitted to Phys. Rev. B

References in corpus (6)

• The pseudogap in high-temperature superconductors: an experimental survey
• Destruction of the Fermi Surface in Underdoped High Tc Superconductors
• Ferromagnetic spin fluctuation induced superconductivity in Sr_2RuO_4
• Non-Fermi liquid behavior of SrRuO_3 -- evidence from infrared conductivity
• Charge-Density-Wave induced modifications to the quasiparticle self-energy in 2H TaSe2
• Spectral evolution in (Ca,Sr)RuO_3 near the Mott-Hubbard transition

Cited by in corpus (6)

• Systematic trends in the electronic structure parameters of 4d transition metal oxides SrMO_{3} (M = Zr, Mo, Ru, and Rh)
• Electrodynamics of the Nodal Metal in Weakly Doped High-$T_c$ Cuprates
• Non-Fermi liquid behavior and scaling of low frequency suppression in optical conductivity spectra of CaRuO${}_3$
• Temperature-dependent Raman spectroscopy in BaRuO${}_3$ systems
• Magnetotransport properties of BaRuO${}_3$: Observation of two scattering rates
• Ground state tuning of the metal-insulator transition by compositional variations in BaIr1-xRuxO3(0<x<1)