Identification of a characteristic doping for charge order phenomena in Bi-2212 cuprates via RIXS
Journal article, 2022
Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Recently, signatures of quantum fluctuations associated with charge order (CO) have been inferred from the anomalous enhancement of CO excitations that accompany the reduction of the CO order parameter in the superconducting state. To gain more insight into the interplay between CO and superconductivity, here we investigate the doping dependence of this phenomenon throughout the Bi-2212 cuprate phase diagram using resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge. As doping increases, the CO wave vector decreases, saturating near a commensurate value of 0.25 reciprocal lattice unit beyond a characteristic doping pc, where the correlation length becomes shorter than the apparent periodicity (4a0). Such behavior is indicative of the fluctuating nature of the CO; the proliferation of CO excitations in the superconducting state also appears strongest at pc, consistent with expected behavior at a CO QCP. Intriguingly, pc appears to be near optimal doping, where the superconducting transition temperature Tc is maximal.
Author
Haiyu Lu
Stanford University
Makoto Hashimoto
Stanford Synchrotron Radiation Laboratory
Su Di Chen
Stanford University
Shigeyuki Ishida
National Institute of Advanced Industrial Science and Technology (AIST)
Dongjoon Song
National Institute of Advanced Industrial Science and Technology (AIST)
H. Eisaki
National Institute of Advanced Industrial Science and Technology (AIST)
Abhishek Nag
Diamond Light Source
M. Garcia-Fernandez
Diamond Light Source
Riccardo Arpaia
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Polytechnic University of Milan
Giacomo Ghiringhelli
Polytechnic University of Milan
Lucio Braicovich
Polytechnic University of Milan
European Synchrotron Radiation Facility (ESRF)
Jan Zaanen
Instituut-Lorentz for Theoretical Physics, Leiden
Brian Moritz
Stanford University
Kurt Kummer
European Synchrotron Radiation Facility (ESRF)
Nicholas B. Brookes
European Synchrotron Radiation Facility (ESRF)
Ke Jin Zhou
Diamond Light Source
Zhi Xun Shen
Stanford University
Thomas P. Devereaux
Stanford University
Wei Sheng Lee
Stanford University
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 106 15 155109Subject Categories
Atom and Molecular Physics and Optics
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevB.106.155109