ω / T scaling of the optical conductivity in strongly correlated layered cobalt oxide

We report infrared spectroscopic properties of the strongly correlated layered cobalt oxide [BiBa sub(0.66)K sub(0.36)O sub(2)]CoCO sub(2). These measurements, performed on single crystals, allow us to determine the optical conductivity as a function of the temperature. In addition to a large temper...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-01, Vol.87 (3), Article 035102
Main Authors: Limelette, P., Ta Phuoc, V., Gervais, F., Frésard, R.
Format: Article
Language:English
Subjects:
Cobalt oxides
Condensed Matter
Correlation
Damping
Infrared
Liquids
Low energy
Physics
Spectra
Strongly Correlated Electrons
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description We report infrared spectroscopic properties of the strongly correlated layered cobalt oxide [BiBa sub(0.66)K sub(0.36)O sub(2)]CoCO sub(2). These measurements, performed on single crystals, allow us to determine the optical conductivity as a function of the temperature. In addition to a large temperature-dependent transfer of spectral weight, an unconventional low-energy mode is found. We show that both its frequency and its damping scale as the temperature itself. In fact, a basic analysis demonstrates that this mode fully scales onto a function of omega /T up to room temperature. This behavior suggests low-energy excitations of non-Fermi liquid type originating from quantum criticality.
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subjects Cobalt oxides
Condensed Matter
Correlation
Damping
Infrared
Liquids
Low energy
Physics
Spectra
Strongly Correlated Electrons
title ω / T scaling of the optical conductivity in strongly correlated layered cobalt oxide
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