Abstract
Three-dimensional, commensurate long-range magnetic order in quickly evolves to quasi-two-dimensional, incommensurate correlations upon doping with mobile holes, and superconductivity follows for as small as 0.05 in the family of superconductors. The onset of superconductivity in these systems is known to be coincident with a remarkable rotation of the incommensurate spin order from “diagonal stripes” below = 0.05 to “parallel stripes” above. However, little is known about the spin correlations at optimal and high doping levels, around and beyond the proposed quantum critical point for the pseudogap phase, . Here, we present elastic and inelastic neutron scattering measurements on single crystals of with = 0.125, 0.19, 0.24, and 0.26 and show that two-dimensional, quasistatic, parallel spin stripes have an onset at temperatures such that the parallel spin stripe phase extends beyond and envelops the entirety of superconducting ground states in this system. We also show that the elastic order parameter for parallel spin stripes at optimum doping, = 0.19, displays an inflection point at superconducting , while the low-energy dynamic spectral weight of parallel stripe fluctuations grows with decreasing temperature and saturates below .
3 More- Received 2 September 2020
- Revised 12 March 2021
- Accepted 29 April 2021
DOI:https://doi.org/10.1103/PhysRevResearch.3.023151
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Published by the American Physical Society