Signature of quantum criticality in cuprates by charge density fluctuations

@ARTICLE{Arpaia2023,
	author = {Arpaia, Riccardo and Martinelli, Leonardo and Sala, Marco Moretti and Caprara, Sergio and Nag, Abhishek and Brookes, Nicholas B. and Camisa, Pietro and Li, Qizhi and Gao, Qiang and Zhou, Xingjiang and Garcia-Fernandez, Mirian and Zhou, Ke-Jin and Schierle, Enrico and Bauch, Thilo and Peng, Ying Ying and Di Castro, Carlo and Grilli, Marco and Lombardi, Floriana and Braicovich, Lucio and Ghiringhelli, Giacomo},
	title = {Signature of quantum criticality in cuprates by charge density fluctuations},
	year = {2023},
	journal = {Nature Communications},
	volume = {14},
	number = {1},
	doi = {10.1038/s41467-023-42961-5},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176135995&doi=10.1038%2fs41467-023-42961-5&partnerID=40&md5=c4fc5c4a9a28017a98437bb4d2a9b4f9},
	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. © 2023, The Author(s).},
	correspondence_address = {R. Arpaia; Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, SE-41296, Sweden; email: riccardo.arpaia@chalmers.se; G. Ghiringhelli; Dipartimento di Fisica, Politecnico di Milano, Milano, Piazza Leonardo da Vinci 32, I-20133, Italy; email: giacomo.ghiringhelli@polimi.it},
	type = {Article},
	publication_stage = {Final},
	source = {Scopus},
	note = {All Open Access, Gold Open Access, Green Open Access}
}