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

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

2001-07-31

arxiv.org/abs/cond-mat/0107625v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 figures. submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.165109

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.

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