Characterization of two electronic subsystems in cuprates through optical conductivity

Scientific paper - Original scientific paper

• Author: C. M. N. Kumar
• Author: Ana Akrap
• Author: C. C. Homes
• Author: E. Martino
• Author: B. Klebel-Knobloch
• Author: W. Tabis
• Author: Osor Slaven Barišić
• Author: Denis K. Sunko
• Author: Neven Barišić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

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 HgBa2⁢CuO4+𝛿 and optimally doped Bi2⁢Sr2⁢CaCu2⁢O8+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. 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.

• Keywords (english): Optical conductivity; high-Tc superconductivity
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review B
• Numbering: vol. 107, no. 14, 144515
• p-ISSN: 2469-9950
• e-ISSN: 2469-9969
• DOI: https://doi.org/10.1103/PhysRevB.107.144515
• URN:NBN: urn:nbn:hr:217:251723
• Publication: 2023
• Project: Number: 725521; Title (croatian): The Janus-face of the localized carrier in cuprates: Generating the pseudogap and high temperature superconductivity; Title (english): The Janus-face of the localized carrier in cuprates: Generating the pseudogap and high temperature superconductivity; Acronym: TheONE; Jurisdiction: eu; Funding stream: European Research Council
• Project: Number: IP-2018-01-7828; Title (croatian): Sulfasoli: nova generacija kompleksnih funkcionalnih materijala; Title (english): Sulfosalts: new generation of complex fuctional materials; Acronym: SulfNewFunMat; Leader: Denis Sunko; Jurisdiction: Croatia; Funding stream: Research Projects
• Project: Number: KK.01.1.1.02.0013; Title (croatian): Centar za Napredna Istraživanja Kompleksnih Sustava; Title (english): Centre for Advanced Research of Complex Systems; Acronym: CeNIKS; Leader: Mihael Srđan Grbić; Jurisdiction: eu; Funding stream: European Regional Development Fund
• Project: Number: KK.01.1.1.01.0004; Title (croatian): Provedba vrhunskih istraživanja u sklopu Znanstvenog centra izvrsnosti za kvantne i kompleksne sustave te reprezentacije Liejevih algebri; Title (english): Implementation of top research within the Scientific Center of Excellence for Quantum and Complex Systems, and Representations of Lie Algebras; Acronym: QuantiXLie; Leader: Hrvoje Buljan; Jurisdiction: eu; Funding stream: European Regional Development Fund
• Document URL: https://link.aps.org/doi/10.1103/PhysRevB.107.144515
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2023 American Physical Society. Received 1 July 2022. Revised 7 April 2023. Accepted 12 April 2023. Published 27 April 2023.
• Created on: 2024-07-23 11:00:13