Abstract
The unconventional normal-state properties of the cuprates are often discussed in terms of emergent electronic order that onsets below a putative critical doping of xc ≈ 0.19. Charge density wave (CDW) correlations represent one such order; however, experimental evidence for such order generally spans a limited range of doping that falls short of the critical value xc, leading to questions regarding its essential relevance. Here, we use X-ray diffraction to demonstrate that CDW correlations in La2−xSrxCuO4 persist up to a doping of at least x = 0.21. The correlations show strong changes through the superconducting transition, but no obvious discontinuity through xc ≈ 0.19, despite changes in Fermi surface topology and electronic transport at this doping. These results demonstrate the interaction between CDWs and superconductivity even in overdoped cuprates and prompt a reconsideration of the role of CDW correlations in the high-temperature cuprate phase diagram.
Highlights
The cuprate high-Tc superconductors are often conceptualized as doped Mott insulators, in which the electronic ground state spontaneously breaks rotational and/or translational symmetry[1,2,3,4].While cuprate Charge density wave (CDW) correlations were discovered over two decades ago[5], their possible contribution to the material’s anomalous electronic properties remains a matter of vigorous debate[1,6,7,8,9,10]
If CDW correlations are confined to underdoped cuprates, as previously suggested[11,12,13,14,15,16,17,18,19,20,21], that would preclude the possibility of CDW correlations having an important role in the anomalous electronic properties
It has been argued that since CDW correlations disappear at x ≪ xc, the quantum critical point (QCP) at x = xc must be magnetic in nature[8]
Summary
The cuprate high-Tc superconductors are often conceptualized as doped Mott insulators, in which the electronic ground state spontaneously breaks rotational and/or translational symmetry[1,2,3,4]. While cuprate CDW correlations were discovered over two decades ago[5], their possible contribution to the material’s anomalous electronic properties remains a matter of vigorous debate[1,6,7,8,9,10] This issue has gained increasing attention in light of the ubiquity of CDW order in different cuprate families[5,11,12,13,14,15,16,17,18,19]. Reentrant charge order, disconnected from the CDW at lower doping, was observed in overdoped (Bi, Pb)2.12Sr1.88CuO6+δ19 These results motivate a reconsideration of the cuprate phase diagram, in which CDW correlations may extend up to higher dopings than previously thought[33].
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