Fate of charge order in overdoped La-based cuprates

K. von Arx; Qisi Wang; S. Mustafi; D. G. Mazzone; M. Horio; D. John Mukkattukavil; E. Pomjakushina; S. Pyon; T. Takayama; H. Takagi; T. Kurosawa; N. Momono; M. Oda; N. B. Brookes; D. Betto; W. Zhang; T. C. Asmara; Y. Tseng; T. Schmitt; Y. Sassa; J. Chang

doi:10.1038/s41535-023-00539-w

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arXiv · 2206.06695

Fate of charge order in overdoped La-based cuprates

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Abstract

In high-temperature cuprate superconductors, stripe order refers broadly to a coupled spin and charge modulation with a commensuration of eight and four lattice units, respectively. How this stripe order evolves across optimal doping remains a controversial question. Here we present a systematic resonant inelastic x-ray scattering (RIXS) study of weak charge correlations in La2-xSrxCuO4 (LSCO) and La1.8-xEu0.2SrxCuO4 (LESCO). Ultra high energy resolution experiments demonstrate the importance of the separation of inelastic and elastic scattering processes. Upon increasing doping x, the long-range temperature dependent stripe order is found to be replaced by short-range temperature independent correlations at a critical point xc = 0.15 distinct from the pseudogap critical doping. We argue that the doping and temperature independent short-range correlations originate from unresolved electron-phonon coupling that broadly peaks at the stripe ordering vector. In LSCO, long-range static stripe order vanishes in a quantum critical point around optimal doping.

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K. von Arx, Qisi Wang, S. Mustafi, D. G. Mazzone, M. Horio, D. John Mukkattukavil, E. Pomjakushina, S. Pyon, T. Takayama, H. Takagi, T. Kurosawa, N. Momono, M. Oda, N. B. Brookes, D. Betto, W. Zhang, T. C. Asmara, Y. Tseng, T. Schmitt, Y. Sassa, J. Chang. 2022-06-14. Fate of charge order in overdoped La-based cuprates. https://doi.org/10.1038/s41535-023-00539-w

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