Development of spin-wave-like dispersive excitations below the pseudogap temperature in the high-temperature superconductor La2−xSrxCuO4
M. Matsuura, S. Kawamura, M. Fujita, R. Kajimoto, K. Yamada
DOI 10.1103/PhysRevB.95.024504 · Physical Review B
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Abstract
Inelastic neutron scattering measurements of magnetic excitations in hole-doped high-Tc cuprates La2−xSrxCuO4 (x=0 and 0.075) have been performed over a wide temperature range of 5–500 K extending beyond the pseudogap temperature of ∼360 K for x=0.075. For x=0, the two-dimensional spin-wave excitations at low temperatures are thermally robust and the dispersion is slightly softened on heating up to T=400 K. For x=0.075, the spin-wave-like excitations in the upper part of the hourglass-shaped dispersion remain at T=300 K. However, further heating above T=400 K induces a broad ridge centered at (1/2,1/2); thereby the hourglass-shaped dispersion becomes blurred above the pseudogap temperature. The localized spin nature of magnetic excitations below T* suggests that the pseudogap is related to the proximity to a Mott insulator rather than being a precursor of Cooper pairs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | midpoint |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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