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  • Title: Magnetic excitations and phase separation in the underdoped La2-xSrxCuO4 superconductor measured by resonant inelastic X-ray scattering.
    Author: Braicovich L, van den Brink J, Bisogni V, Sala MM, Ament LJ, Brookes NB, De Luca GM, Salluzzo M, Schmitt T, Strocov VN, Ghiringhelli G.
    Journal: Phys Rev Lett; 2010 Feb 19; 104(7):077002. PubMed ID: 20366909.
    Abstract:
    We probe the collective magnetic modes of La2CuO4 and underdoped La2-xSrxCuO4 (LSCO) by momentum resolved resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge. For the undoped antiferromagnetic sample, we show that the single magnon dispersion measured with RIXS coincides with the one determined by inelastic neutron scattering, thus demonstrating that x rays are an alternative to neutrons in this field. In the spin dynamics of LSCO, we find a branch dispersing up to approximately 400 meV coexisting with one at lower energy. The high-energy branch has never been seen before. It indicates that underdoped LSCO is in a dynamic inhomogeneous spin state.
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