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Interplay between relaxational atomic fluctuations and charge density waves in
Phys. Rev. B 108, L201111 – Published 13 November, 2023
DOI: https://doi.org/10.1103/PhysRevB.108.L201111
Abstract
In the cuprate superconductors, the spatial coherence of the charge density wave (CDW) state grows below a temperature , the origin of which is debated. Using x-ray photon correlation spectroscopy, we have studied the temporal atomic relaxation dynamics in to shed light on this question. Cooling within an emergent structurally distorted phase, which favors the CDW modulation in symmetry and develops in two stages between 180 and 120 K, we observe a crossover from cooperativelike to incoherentlike relaxation dynamics at . We argue that, if the CDW is hosted by this distortion, the concomitant relaxational crossover and enhancement of CDW spatial coherence supports the interplay between relaxational atomic fluctuations and CDWs in materials of this class on quasistatic times cales.
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