Signature of quantum criticality in cuprates by charge density fluctuations

<p>[This repository contains the raw data for the manuscript &quot;<strong>Signature of quantum criticality in cuprates by charge density fluctuations</strong>&quot; (arXiv:2208.13918)]</p> <p>The universality of the strange metal phase in many quantum materials is often attributed to the presence of a quantum critical point (QCP), a zero-temperature phase transition ruled by quantum fluctuations. In cuprates, where superconductivity hinders direct QCP observation, indirect evidence comes from the identification of fluctuations compatible with the strange metal phase.&nbsp; Here we show that the recently discovered charge density fluctuations (CDF) possess the right properties to be associated to a quantum phase transition. Using resonant x-ray scattering, we studied the CDF in two families of cuprate superconductors across a wide doping range (up to <em>p</em>=0.22). At <em>p</em>*&asymp;0.19, the putative QCP, the CDF intensity peaks, and the characteristic energy &Delta; is minimum, marking a wedge-shaped region in the phase diagram indicative of a quantum critical behavior, albeit with anomalies. These findings strengthen the role of charge order in explaining strange metal phenomenology and provide insights into high-temperature superconductivity.</p>