Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering

Abstract

Using resonant inelastic x-ray scattering (RIXS) at the Cu $L$-absorption edge, we have observed intense, dispersive spin excitations in highly overdoped Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$ (superconducting $T_c=6$ K), a compound whose normal-state charge transport and thermodynamic properties have been studied extensively and shown to exhibit canonical Fermi-liquid behavior. Complementary RIXS experiments on slightly overdoped Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$ ($T_c=89$ K) and on Y${}_{1-x}$Ca${}_x$Ba${}_2$Cu${}_3$O${}_{6+\delta }$ compounds spanning a wide range of doping levels indicate that these excitations exhibit energies and energy-integrated spectral weights closely similar to those of antiferromagnetic magnons in undoped cuprates. The surprising coexistence of Fermi-liquid-like charge excitations and high-energy spin excitations reminiscent of antiferromagnetic insulators in highly overdoped compounds poses a challenge to current theoretical models of the cuprates.

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