Observation of Spin Fluctuations in a High-Tc Parent Compound Using Resonant Inelastic X-ray Scattering

B. Freelon , P. G. Medaglia , A. Tebano , G. Balestrino , K. Okada , A. Kotani , F. Vernay , T. P. Devereaux

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P. A. Glans T. Learmonth K. E. Smith A. L. D. Kilcoyne B.Rude I. Furtado J.-H. Guo

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classification ❄️ cond-mat.supr-con

keywords scatteringspinantiferromagneticcacuo2compoundexchangefirstfluctuations

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We report the first observation of soft-x-ray scattering from spin fluctuations in a high-Tc parent compound. An antiferromagnetic charge transfer insulator, CaCuO2, was irradiated by Cu M-edge soft x-rays. Ultra-high resolution measurements of scattered intensity revealed magnon-magnon excitations, due to spin exchange scattering, as low-energy loss features. The process is analogous to optical Raman scattering. The spectra provide the first measurement of the two-magnon excitation energy and the antiferromagnetic exchange parameter in infinite-layer CaCuO2. The results reveal resonant inelastic soft x-ray scattering as a novel probe of the spin dynamics in cuprates.

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Observation of Spin Fluctuations in a High-Tc Parent Compound Using Resonant Inelastic X-ray Scattering

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