Perfect separation of intraband and interband excitations in
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. Here, 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.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Univ. of St. Andrews, St. Andrews (United Kingdom)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1514493
- Alternate Identifier(s):
- OSTI ID: 1512821
- Report Number(s):
- BNL-211620-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 19; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Homes, C. C., Khim, S., and Mackenzie, Andy P. Perfect separation of intraband and interband excitations in PdCoO2. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.99.195127.
Homes, C. C., Khim, S., & Mackenzie, Andy P. Perfect separation of intraband and interband excitations in PdCoO2. United States. https://doi.org/10.1103/PhysRevB.99.195127
Homes, C. C., Khim, S., and Mackenzie, Andy P. Wed .
"Perfect separation of intraband and interband excitations in PdCoO2". United States. https://doi.org/10.1103/PhysRevB.99.195127. https://www.osti.gov/servlets/purl/1514493.
@article{osti_1514493,
title = {Perfect separation of intraband and interband excitations in PdCoO2},
author = {Homes, C. C. and Khim, S. and Mackenzie, Andy P.},
abstractNote = {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. Here, 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.},
doi = {10.1103/PhysRevB.99.195127},
journal = {Physical Review B},
number = 19,
volume = 99,
place = {United States},
year = {Wed May 15 00:00:00 EDT 2019},
month = {Wed May 15 00:00:00 EDT 2019}
}
Web of Science
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