Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi 2 Sr 2 LaCuO 6+δ
In: Proceedings of the National Academy of Sciences, Jg. 117 (2020-06-25), S. 16219-16225
Online
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Zugriff:
Charge density waves (CDWs) are ubiquitous in under-doped cuprate superconductors. As a modulation of the valence electron density, CDWs in hole-doped cuprates possess both Cu-3d and O-2p orbital character owing to the strong hybridization of these orbitals near the Fermi level. Here, we investigate under-doped Bi$_2$Sr$_{1.4}$La$_{0.6}$CuO$_{6+\delta}$ using resonant inelastic X-ray scattering (RIXS) and find that a short-range CDW exists at both Cu and O sublattices in the copper-oxide (CuO2) planes with a comparable periodicity and correlation length. Furthermore, we uncover bond-stretching and bond-buckling phonon anomalies concomitant to the CDWs. Comparing to slightly over-doped Bi$_2$Sr$_{1.8}$La$_{0.2}$CuO$_{6+\delta}$, where neither CDWs nor phonon anomalies appear, we highlight that a sharp intensity anomaly is induced in the proximity of the CDW wavevector (QCDW) for the bond-buckling phonon, in concert with the diffused intensity enhancement of the bond-stretching phonon at wavevectors much greater than QCDW. Our results provide a comprehensive picture of the quasi-static CDWs, their dispersive excitations, and associated electron-phonon anomalies, which are key for understanding the competing electronic instabilities in cuprates.
Comment: 25 pages + Supplementary Information. Proc. Natl Acad. Sci. USA, (2020)
Titel: |
Multiorbital charge-density wave excitations and concomitant phonon anomalies in Bi 2 Sr 2 LaCuO 6+δ
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Autor/in / Beteiligte Person: | Eisaki, Hiroshi ; Johnston, Steven ; Nag, Abhishek ; Li, Jiemin ; Comin, Riccardo ; Robarts, H. C. ; Walters, A. C. ; Pelliciari, Jonathan ; Ding, Hong ; Zhou, Ke-Jin ; Garcia-Fernandez, M. ; Song, Dongjoon |
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Zeitschrift: | Proceedings of the National Academy of Sciences, Jg. 117 (2020-06-25), S. 16219-16225 |
Veröffentlichung: | Proceedings of the National Academy of Sciences, 2020 |
Medientyp: | unknown |
ISSN: | 1091-6490 (print) ; 0027-8424 (print) |
DOI: | 10.1073/pnas.2001755117 |
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