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Determining the ele...
Determining the electron-phonon coupling in superconducting cuprates by resonant inelastic x-ray scattering: Methods and results on Nd1+xBa2-xCu3O7-δ
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- Braicovich, Lucio (author)
- European Synchrotron Radiation Facility (ESRF),Politecnico di Milano,Polytechnic University of Milan
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- Rossi, Matteo (author)
- Politecnico di Milano,Polytechnic University of Milan
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- Fumagalli, Roberto (author)
- Politecnico di Milano,Polytechnic University of Milan
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- Peng, Y. Y. (author)
- Politecnico di Milano,Polytechnic University of Milan
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- Wang, Yan (author)
- University of Tennessee
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- Arpaia, Riccardo, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Betto, Davide (author)
- European Synchrotron Radiation Facility (ESRF)
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- De Luca, Gabriella M. (author)
- Universita Degli Studi Di Napoli Federico Ii,University of Naples Federico II
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- Di Castro, D. (author)
- Universita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata
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- Kummer, Kurt (author)
- European Synchrotron Radiation Facility (ESRF)
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- Moretti Sala, Marco (author)
- Politecnico di Milano,Polytechnic University of Milan
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- Pagetti, Mattia (author)
- Politecnico di Milano,Polytechnic University of Milan
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- Balestrino, G (author)
- Universita degli Studi di Roma Tor Vergata,University of Rome Tor Vergata
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- Brookes, Nicholas B. (author)
- European Synchrotron Radiation Facility (ESRF)
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Salluzzo, Marco (author)
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- Johnston, S. (author)
- Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden,University of Tennessee
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- van den Brink, J. (author)
- Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden,Leibniz Institute for Solid State and Materials Research Dresden,Washington University in St. Louis,Technische Universität Dresden
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- Ghiringhelli, Giacomo (author)
- Politecnico di Milano,Polytechnic University of Milan
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(creator_code:org_t)
- 2020
- 2020
- English.
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In: Physical Review Research. - 2643-1564. ; 2:2
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Abstract
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- The coupling between lattice vibration quanta and valence electrons can induce charge-density modulations and decisively influence the transport properties of materials, e.g., leading to conventional superconductivity. In high-critical-temperature superconductors, where electronic correlation is the main actor, the actual role of electron-phonon coupling (EPC) is being intensely debated theoretically and investigated experimentally. We present an in-depth study of how the EPC strength can be obtained directly from resonant inelastic x-ray scattering (RIXS) data through the theoretical approach derived by Ament et al. [Europhys. Lett. 95, 27008 (2011)]. The role of the model parameters (e.g., phonon energy ω0, intermediate state lifetime 1/Γ, EPC matrix element M, and detuning energy Ω) is thoroughly analyzed, providing general relations among them that can be used to make quantitative estimates of the dimensionless EPC g=(M/ω0)2 without detailed microscopic modeling. We then apply these methods to very high-resolution Cu L3-edge RIXS spectra of three Nd1+xBa2−xCu3O7−δ films. For the insulating antiferromagnetic parent compound, the value of M as a function of the in-plane momentum transfer is obtained for Cu-O bond-stretching (breathing) and bond-bending (buckling) phonon branches. For the underdoped and the nearly optimally doped samples, the effects of Coulomb screening and of charge-density-wave correlations on M are assessed. In light of the anticipated further improvements of the RIXS experimental resolution, this work provides a solid framework for an exhaustive investigation of the EPC in cuprates and other quantum materials.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
- ref (subject category)
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Braicovich, Luci ...
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Rossi, Matteo
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Fumagalli, Rober ...
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Peng, Y. Y.
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Wang, Yan
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Arpaia, Riccardo ...
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Betto, Davide
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De Luca, Gabriel ...
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Di Castro, D.
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Kummer, Kurt
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Moretti Sala, Ma ...
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Pagetti, Mattia
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Balestrino, G
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Brookes, Nichola ...
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Salluzzo, Marco
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Johnston, S.
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van den Brink, J ...
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Ghiringhelli, Gi ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Physical Review ...
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Chalmers University of Technology