Signature of quantum criticality in cuprates by charge density fluctuations

Riccardo Arpaia (), Leonardo Martinelli, Marco Moretti Sala, Sergio Caprara, Abhishek Nag, Nicholas B. Brookes, Pietro Camisa, Qizhi Li, Qiang Gao, Xingjiang Zhou, Mirian Garcia-Fernandez, Ke-Jin Zhou, Enrico Schierle, Thilo Bauch, Ying Ying Peng, Carlo Di Castro, Marco Grilli, Floriana Lombardi, Lucio Braicovich and Giacomo Ghiringhelli ()
Additional contact information
Riccardo Arpaia: Chalmers University of Technology
Leonardo Martinelli: Politecnico di Milano
Marco Moretti Sala: Politecnico di Milano
Sergio Caprara: Università di Roma “La Sapienza”
Abhishek Nag: Harwell Campus
Nicholas B. Brookes: ESRF, The European Synchrotron
Pietro Camisa: Politecnico di Milano
Qizhi Li: Peking University
Qiang Gao: Chinese Academy of Sciences
Xingjiang Zhou: Chinese Academy of Sciences
Mirian Garcia-Fernandez: Harwell Campus
Ke-Jin Zhou: Harwell Campus
Enrico Schierle: Helmholtz-Zentrum Berlin für Materialien und Energie
Thilo Bauch: Chalmers University of Technology
Ying Ying Peng: Peking University
Carlo Di Castro: Università di Roma “La Sapienza”
Marco Grilli: Università di Roma “La Sapienza”
Floriana Lombardi: Chalmers University of Technology
Lucio Braicovich: Politecnico di Milano
Giacomo Ghiringhelli: Politecnico di Milano

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract 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.

Date: 2023
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DOI: 10.1038/s41467-023-42961-5

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