Published October 11, 2023 | Version v1
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Signature of quantum criticality in cuprates by charge density fluctuations

Authors/Creators

  • 1. Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
  • 2. Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
  • 3. Dipartimento di Fisica, Università di Roma "La Sapienza," P.le Aldo Moro 5, I-00185 Roma, Italy
  • 4. Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom
  • 5. ESRF, The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
  • 6. International Center for Quantum Materials, School of Physics, Peking University, CN-100871 Beijing, China
  • 7. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Acad-emy of Sciences, CN-100190 Beijing, China
  • 8. Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, D-12489 Berlin, Germany

Description

[This repository contains the raw data for the manuscript "Signature of quantum criticality in cuprates by charge density fluctuations" (arXiv:2208.13918)]

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.  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 p=0.22). At p*≈0.19, the putative QCP, the CDF intensity peaks, and the characteristic energy Δ 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.

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Additional details

Related works

Is supplement to
10.48550/arXiv.2208.13918 (DOI)