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 La2-xSrxCuO4, spanning the doping phase diagram from the antiferromagnetic Mott insulator at x=0 to the metallic phase at x=0.26. 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.
Doping dependence of the magnetic excitations in La2−xSrxCuO4 / Meyers, D., Miao, H., Walters, A.C., Bisogni, V., Springell, R.S., D'Astuto, M., Dantz, M., Pelliciari, J., Huang, H.Y., Okamoto, J., Huang, D.J., Hill, J.P., He, X., Božović, I., Schmitt, T., Dean, M.P.M.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 95:7(2017), pp. 1-7. [10.1103/physrevb.95.075139]
Doping dependence of the magnetic excitations in La2−xSrxCuO4
Pelliciari, J.;
2017
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 La2-xSrxCuO4, spanning the doping phase diagram from the antiferromagnetic Mott insulator at x=0 to the metallic phase at x=0.26. 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.
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