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

Abstract : We report infrared spectroscopic properties of the strongly correlated layered cobalt oxide [BiBa0.66K0.36O2]CoO2. 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 ω/T up to room temperature. This behavior suggests low-energy excitations of non-Fermi liquid type originating from quantum criticality.
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P. Limelette, V. Ta Phuoc, F. Gervais, R. Fresard. ω / T scaling of the optical conductivity in strongly correlated layered cobalt oxide. Physical Review B : Condensed matter and materials physics, American Physical Society, 2013, 87 (3), ⟨10.1103/physrevb.87.035102⟩. ⟨hal-01870100⟩

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