Hidden Itinerant-Spin Phase in Heavily Overdoped La2−xSrxCuO4 Superconductors Revealed by Dilute Fe Doping: A Combined Neutron Scattering and Angle-Resolved Photoemission Study
Rui-Hua He, M. Fujita, M. Enoki, M. Hashimoto, S. Iikubo, S.-K. Mo, Hong Yao, T. Adachi, Y. Koike, Z. Hussain, Z.-X. Shen, K. Yamada
DOI 10.1103/PhysRevLett.107.127002 · Physical Review Letters
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Abstract
We demonstrated experimentally a direct way to probe a hidden propensity to the formation of a spin-density wave in a nonmagnetic metal with strong Fermi surface nesting. Substituting Fe for a tiny amount of Cu (1%) induced an incommensurate magnetic order below 20 K in heavily overdoped La2−xSrxCuO4. Elastic neutron scattering suggested that this order cannot be ascribed to the localized spins on Cu or doped Fe. Angle-resolved photoemission revealed a strong Fermi surface nesting inherent in the pristine La2−xSrxCuO4 that likely drives this order. Our finding presents the first example of the long-sought “itinerant-spin extreme” of cuprates, where the spins of itinerant doped holes define the magnetic ordering ground state; it complements the current picture of cuprate spin physics that highlights the predominant role of localized spins at lower dopings.
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. | 11 | Pressure not reported | onset |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0 | Pressure not reported | onset |
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