Incommensurate phonon anomaly and the nature of charge density waves in cuprates

Abstract

While charge density wave (CDW) instabilities are ubiquitous to superconducting cuprates, the different ordering wavevectors in various cuprate families have hampered a unified description of the CDW formation mechanism. Here we investigate the temperature dependence of the low energy phonons in the canonical CDW ordered cuprate La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$. We discover that the phonon softening wavevector associated with CDW correlations becomes temperature dependent in the high-temperature precursor phase and changes from a wavevector of 0.238 reciprocal space units (r.l.u.) below the ordering transition temperature up to 0.3~r.l.u. at 300~K. This high-temperature behavior shows that "214"-type cuprates can host CDW correlations at a similar wavevector to previously reported CDW correlations in non-"214"-type cuprates such as YBa${}_2$Cu${}_3$O${}_{6+\delta }$. This indicates that cuprate CDWs may arise from the same underlying instability despite their apparently different low temperature ordering wavevectors.

Accepted in Phys. Rev. X; 9 pages; 5 figures; 3 pages of supplementary material

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• Charge density waves in YBa${}_2$Cu${}_3$O${}_{6.67}$ probed by resonant x-ray scattering under uniaxial compression
• Soft X-ray Spectroscopy of Low-Valence Nickelates
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• Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies
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• Electronic band structures of topological kagome materials
• Structure of Charge Density Waves in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Unusual Hole-doping-dependent Electronic Instability and Electron-Phonon Coupling in Infinite-layer Nickelates
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• Charge ordering mechanism in silver fluoride AgF${}_2$
• In-plane Isotropy of the Low Energy Phonon Anomalies in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Lattice-charge coupling in a trilayer nickelate with intertwined density wave order
• Strong electron-phonon coupling in Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$
• Observation of van der Waals phonons in the single-layer cuprate (Bi,Pb)${}_2$(Sr,La)${}_2$CuO${}_{6+\delta }$
• Bulk charge density wave and electron-phonon coupling in superconducting copper oxychlorides
• Selective coupling of coherent optical phonons in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ with electronic transitions
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress