Doping dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates

Peng, Yingying; Martinelli, Leonardo; Li, Qizhi; Rossi, Matteo; Mitrano, Matteo; Arpaia, Riccardo; Sala, Marco Moretti; Gao, Qiang; Guo, Xuefei; De Luca, Gabriella Maria; Walters, Andrew; Nag, Abhishek; Barbour, Andi; Gu, Genda; Pelliciari, Jonathan; Brookes, Nicholas B.; Abbamonte, Peter; Salluzzo, Marco; Zhou, Xingjiang; Zhou, Ke-Jin; Bisogni, Valentina; Braicovich, Lucio; Johnston, Steven; Ghiringhelli, Giacomo

doi:10.1103/physrevb.105.115105

Title: Doping dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates

Journal Article · Fri Mar 04 00:00:00 EST 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.115105· OSTI ID:1889641

^[1]; Martinelli, Leonardo ^[2]; Li, Qizhi ^[1];

^[2];

^[3]; Arpaia, Riccardo ^[4];

^[2]; Gao, Qiang ^[5]; Guo, Xuefei ^[3];

^[6]; Walters, Andrew ^[7];

^[7]; Barbour, Andi ^[8]; Gu, Genda ^[9]; Pelliciari, Jonathan ^[8]; Brookes, Nicholas B. ^[10]; Abbamonte, Peter ^[3];

^[11]; Zhou, Xingjiang ^[5];

^[7] more »

Peking Univ., Beijing (China)
Politecnico di Milano (Italy)
Univ. of Illinois, Urbana, IL (United States)
Politecnico di Milano (Italy); Chalmers University of Technology, Gothenburg (Sweden)
Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of Naples Federico II (Italy); National Research Council (CNR) (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)
Diamond Light Source (United Kingdom)
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
European Synchrotron Radiation Facility (ESRF), Grenoble (France)
National Research Council (CNR) (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)
Politecnico di Milano (Italy); European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Univ. of Tennessee, Knoxville, TN (United States)
Politecnico di Milano (Italy); National Research Council (CNR) (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)

While electron-phonon coupling (EPC) is crucial for Cooper pairing in conventional superconductors, its role in high-Tc superconducting cuprates is debated. Here, using resonant inelastic x-ray scattering at the oxygen K edge, we study the EPC in Bi₂Sr₂CaCu₂O_8+δ (Bi2212) and Nd_1+xBa_2-xCu₃O_7-δ (NBCO) at different doping levels ranging from heavily underdoped (p=0.07) to overdoped (p=0.21). We analyze the data with a localized Lang-Firsov model that allows for the coherent excitations of two phonon modes. While electronic band dispersion effects are non-negligible, we are able to perform a study of the relative values of EPC matrix elements in these cuprate families. In the case of NBCO, the choice of the excitation energy allows us to disentangle modes related to the CuO chains and the CuO₂ planes. Combining the results from the two families, we find the EPC strength decreases with doping at q∥=(-0.25, 0) r.l.u., but has a nonmonotonic trend as a function of doping at smaller momenta. This behavior is attributed to the screening effect of charge carriers. We also find that the phonon intensity is enhanced in the vicinity of the charge-density-wave excitations while the extracted EPC strength appears to be less sensitive to their proximity. By performing a comparative study of two cuprate families, we are able to identify general trends in the EPC for the cuprates and provide experimental input to theories invoking a synergistic role for this interaction in d -wave pairing.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences; Ministry of Science and Technology of China; National Natural Science Foundation of China (NSFC); Gordon and Betty Moore Foundation; National Key Research and Development Program of China; Chinese Academy of Sciences; National Science Foundation (NSF); Ministry for University and Research (MIUR); Swedish Research Council (VR)

Grant/Contract Number:: SC0012704; 2019YFA0308401; 11974029; GBMF-9452; 11888101; 2016YFA0300300; XDB25000000; DMR-1842056

OSTI ID:: 1889641

Report Number(s):: BNL-223492-2022-JAAM; TRN: US2310058

Journal Information:: Physical Review. B, Vol. 105, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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