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We report a detailed inelastic neutron scattering study of the collective magnetic excitations of overdoped superconducting La1.78Sr0.22CuO4 for the energy range 0-160 meV. Our measurements show that overdoping suppresses the strong response present for optimally doped La2-xSrxCuO4 which is peaked near 50 meV. The remaining response is peaked at incommensurate wave vectors for all energies investigated. We observe a strong high-frequency magnetic response for E80 >~ meV suggesting that significant antiferromagnetic exchange couplings persist well into the overdoped part of the cuprate phase diagram.
|Translated title of the contribution||Persistence of High-Frequency Spin Fluctuations in Overdoped Superconducting La2-xSrxCuO4 (x=0.22)|
|Pages (from-to)||1 - 4|
|Number of pages||4|
|Journal||Physical Review Letters|
|Volume||99 (6, 067002)|
|Publication status||Published - Aug 2007|
Bibliographical notePublisher: American Physical Society
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1/10/04 → 1/10/09