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Perfect separation of intraband and interband excitations in PdCoO2

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Khim,  S.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  A. P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Homes, C. C., Khim, S., & Mackenzie, A. P. (2019). Perfect separation of intraband and interband excitations in PdCoO2. Physical Review B, 99(19): 195127, pp. 1-7. doi:10.1103/PhysRevB.99.195127.


Cite as: http://hdl.handle.net/21.11116/0000-0003-B252-7
Abstract
The temperature dependence of the optical properties of the delafossite PdCoO2 has been measured in the a-b planes over a wide frequency range. The optical conductivity due to the free-carrier (intraband) response falls well below the interband transitions, allowing the plasma frequency to be determined from the f-sum rule. Drude-Lorentz fits to the complex optical conductivity yield estimates for the free-carrier plasma frequency and scattering rate. The in-plane plasma frequency has also been calculated using density functional theory. The experimentally determined and calculated values for the plasma frequencies are all in good agreement; however, at low temperature the optically determined scattering rate is much larger than the estimate for the transport scattering rate, indicating a strong frequency-dependent renormalization of the optical scattering rate. In addition to the expected in-plane infrared-active modes, two very strong features are observed that are attributed to the coupling of the in-plane carriers to the out-of-plane longitudinal optic modes.