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  Perfect separation of intraband and interband excitations in PdCoO2

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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-B252-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B254-5
Genre: Journal Article

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 Creators:
Homes, C. C.1, Author
Khim, S.2, Author              
Mackenzie, A. P.3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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 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.

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Language(s): eng - English
 Dates: 2019-05-152019-05-15
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 99 (19) Sequence Number: 195127 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008