Signature of quantum criticality in cuprates by charge density fluctuations
Artikel i vetenskaplig tidskrift, 2023
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.
Författare
Riccardo Arpaia
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
L. Martinelli
Politecnico di Milano
Marco Moretti Sala
Politecnico di Milano
S. Caprara
Sapienza, Università di Roma
Istituto Dei Sistemi Complessi, Rome
Abhishek Nag
Diamond Light Source
Nicholas B. Brookes
European Synchrotron Radiation Facility (ESRF)
Pietro Camisa
Politecnico di Milano
Qizhi Li
Beijing University of Technology
Qiang Gao
Chinese Academy of Sciences
Xingjiang Zhou
Chinese Academy of Sciences
M. Garcia-Fernandez
Diamond Light Source
Ke Jin Zhou
Diamond Light Source
Enrico Schierle
Helmholtz
Thilo Bauch
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Y. Y. Peng
Beijing University of Technology
C. Di Castro
Sapienza, Università di Roma
M. Grilli
Sapienza, Università di Roma
Istituto Dei Sistemi Complessi, Rome
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Lucio Braicovich
European Synchrotron Radiation Facility (ESRF)
Politecnico di Milano
Giacomo Ghiringhelli
Politecnico di Milano
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 14 1 7198Kvantfluktuationer och Kvantsammanflätning i Högtemperatursupraledare
Vetenskapsrådet (VR) (2020-05184), 2021-01-01 -- 2024-12-31.
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Ämneskategorier
Teoretisk kemi
Fusion, plasma och rymdfysik
Den kondenserade materiens fysik
DOI
10.1038/s41467-023-42961-5
PubMed
37938250