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Characterization of two electronic subsystems in cuprates through optical conductivity
Abstract
Understanding the physical properties of unconventional superconductors as well as of other correlated materials presents a formidable challenge. Their unusual evolution with doping, frequency, and temperature has frequently led to non-Fermi-liquid (non-FL) interpretations. Optical conductivity is a major challenge in this context. Here, the optical spectra of two archetypal cuprates, underdoped HgBa2CuO4+δ and optimally doped Bi2Sr2CaCu2O8+δ, are interpreted based on the standard Fermi-liquid (FL) paradigm. At both dopings, perfect frequency-temperature FL scaling is found to be modified by the presence of a second, gapped electronic subsystem. Further, this non-FL component emerges as a well-defined mid-infrared spectral feature after the FL contribution, determined independently by transport, is subtracted. Temperature, frequency, and doping evolution of the MIR feature identify a gapped rather than dissipative response. In contrast, the dissipative response is found to be relevant for pnictides and ruthenates. Such an unbiased FL/non-FL separation is extended across the cuprate phase diagram, capturing all the key features of the normal state and providing a natural explanation why the superfluid density is attenuated on the overdoped side. Thus, we obtain a unified interpretation of optical responses and transport measurements in all analyzed physical regimes and all analyzed compounds.
- Authors:
-
[1];
[2];
[3];
[4];
[5];
[6];
[7];
[8];
[9]
- Vienna Univ. of Technology (TU Wien) (Austria); Institute of Physics, Zagreb (Croatia); Polish Academy of Sciences (PAS), Krakow (Poland)
- University of Fribourg (Switzerland)
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
- Vienna Univ. of Technology (TU Wien) (Austria)
- Vienna Univ. of Technology (TU Wien) (Austria); AGH University of Science and Technology, Krakow (Poland)
- Institute of Physics, Zagreb (Croatia)
- Univ. of Zagreb (Croatia)
- Vienna Univ. of Technology (TU Wien) (Austria); Univ. of Zagreb (Croatia)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); European Research Council (ERC); European Regional Development Fund (ERDF); Croatian Science Foundation (HRZZ); National Science Centre of Poland (NCN); Polish National Agency for Academic Exchange (NAWA); Ministry of Science and Higher Education; ICAM; Gordon and Betty Moore Foundation
- OSTI Identifier:
- 1984420
- Report Number(s):
- BNL-224469-2023-JAAM
Journal ID: ISSN 2469-9950; TRN: US2402963
- Grant/Contract Number:
- SC0012704; 725521; KK.01.1.1.02.0013; UMO-2021/41/B/ST3/03454; KK.01.1.1.01.0004; GBMF5305
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 107; Journal Issue: 14; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Kumar, C. M. N., Akrap, A., Homes, Chris C., Martino, E., Klebel-Knobloch, B., Tabis, W., Barišić, O. S., Sunko, D. K., and Barišić, N. Characterization of two electronic subsystems in cuprates through optical conductivity. United States: N. p., 2023.
Web. doi:10.1103/physrevb.107.144515.
Kumar, C. M. N., Akrap, A., Homes, Chris C., Martino, E., Klebel-Knobloch, B., Tabis, W., Barišić, O. S., Sunko, D. K., & Barišić, N. Characterization of two electronic subsystems in cuprates through optical conductivity. United States. https://doi.org/10.1103/physrevb.107.144515
Kumar, C. M. N., Akrap, A., Homes, Chris C., Martino, E., Klebel-Knobloch, B., Tabis, W., Barišić, O. S., Sunko, D. K., and Barišić, N. Thu .
"Characterization of two electronic subsystems in cuprates through optical conductivity". United States. https://doi.org/10.1103/physrevb.107.144515.
@article{osti_1984420,
title = {Characterization of two electronic subsystems in cuprates through optical conductivity},
author = {Kumar, C. M. N. and Akrap, A. and Homes, Chris C. and Martino, E. and Klebel-Knobloch, B. and Tabis, W. and Barišić, O. S. and Sunko, D. K. and Barišić, N.},
abstractNote = {Understanding the physical properties of unconventional superconductors as well as of other correlated materials presents a formidable challenge. Their unusual evolution with doping, frequency, and temperature has frequently led to non-Fermi-liquid (non-FL) interpretations. Optical conductivity is a major challenge in this context. Here, the optical spectra of two archetypal cuprates, underdoped HgBa2CuO4+δ and optimally doped Bi2Sr2CaCu2O8+δ, are interpreted based on the standard Fermi-liquid (FL) paradigm. At both dopings, perfect frequency-temperature FL scaling is found to be modified by the presence of a second, gapped electronic subsystem. Further, this non-FL component emerges as a well-defined mid-infrared spectral feature after the FL contribution, determined independently by transport, is subtracted. Temperature, frequency, and doping evolution of the MIR feature identify a gapped rather than dissipative response. In contrast, the dissipative response is found to be relevant for pnictides and ruthenates. Such an unbiased FL/non-FL separation is extended across the cuprate phase diagram, capturing all the key features of the normal state and providing a natural explanation why the superfluid density is attenuated on the overdoped side. Thus, we obtain a unified interpretation of optical responses and transport measurements in all analyzed physical regimes and all analyzed compounds.},
doi = {10.1103/physrevb.107.144515},
journal = {Physical Review. B},
number = 14,
volume = 107,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2023},
month = {Thu Apr 27 00:00:00 EDT 2023}
}
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