Abstract
The magnetic correlations within the cuprates have undergone intense scrutiny as part of efforts to understand high-temperature superconductivity. We explore the evolution of the magnetic correlations along the nodal direction of the Brillouin zone in , spanning the doping phase diagram from the antiferromagnetic Mott insulator at to the metallic phase at . Magnetic excitations along this direction are found to be systematically softened and broadened with doping, at a higher rate than the excitations along the antinodal direction. This phenomenology is discussed in terms of the nature of the magnetism in the doped cuprates. Survival of the high-energy magnetic excitations, even in the overdoped regime, indicates that these excitations are marginal to pairing, while the influence of the low-energy excitations remains ambiguous.
- Received 25 November 2016
- Revised 19 January 2017
DOI:https://doi.org/10.1103/PhysRevB.95.075139
©2017 American Physical Society