Raman scattering in cuprate oxychlorides high-temperature superconductors single-crystals
Abstract
We investigate the Raman response of sodium-doped cuprate oxychloride NaxCa2−xCuO2Cl2 high-temperature superconductors across their entire phase diagram, from the antiferromagnetic to the superconducting region. In addition to the expected Raman-active phonon modes, we detect several additional modes that can be interpreted as being excited via a resonance process enabled by strong electron--phonon coupling. To verify the resonance effect, the Raman response at different incident photon energies was measured. At high energies, there is a well-defined B1g mode in the antiferromagnetic phase, which can be interpreted as a bimagnon We follow its temperature and doping dependence, providing information on the multimagnon excitation in these cuprates, which can be theoretically linked to the exchange interaction.
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BibTeX
@misc{fawaz2026raman,
title = {{Raman scattering in cuprate oxychlorides high-temperature superconductors single-crystals}},
author = {Chafic Fawaz and Yingzheng Gao and Luca Laveder and Lorenzo Menon and Owen Moulding and Rolf Heid and Blair W Lebert and Christophe Bellin and Keevin Beneut and David Santos-Cottin and Ikuya Yamada and Yuichi Okazaki and Hajime Yamamoto and Masaki Azuma and M.-A. Méasson and Matteo d'Astuto},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.22400},
eprint = {2609.22400},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05742802v2},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Raman scattering in cuprate oxychlorides high-temperature superconductors single-crystals
AU - Chafic Fawaz
AU - Yingzheng Gao
AU - Luca Laveder
AU - Lorenzo Menon
AU - Owen Moulding
AU - Rolf Heid
AU - Blair W Lebert
AU - Christophe Bellin
AU - Keevin Beneut
AU - David Santos-Cottin
AU - Ikuya Yamada
AU - Yuichi Okazaki
AU - Hajime Yamamoto
AU - Masaki Azuma
AU - M.-A. Méasson
AU - Matteo d'Astuto
PY - 2026
DA - 2026/09/08
PB - HAL
DO - 10.48550/arxiv.2609.22400
UR - https://hal.science/hal-05742802v2
AB - We investigate the Raman response of sodium-doped cuprate oxychloride Na_xCa_2−xCuO_2Cl_2 high-temperature superconductors across their entire phase diagram, from the antiferromagnetic to the superconducting region. In addition to the expected Raman-active phonon modes, we detect several additional modes that can be interpreted as being excited via a resonance process enabled by strong electron--phonon coupling. To verify the resonance effect, the Raman response at different incident photon energies was measured. At high energies, there is a well-defined B_1g mode in the antiferromagnetic phase, which can be interpreted as a bimagnon We follow its temperature and doping dependence, providing information on the multimagnon excitation in these cuprates, which can be theoretically linked to the exchange interaction.
ER -