High-Energy Magnetic Excitations in the Cuprate Superconductor Bi₂Sr₂CaCu₂O_8+δ: Towards a Unified Description of Its Electronic and Magnetic Degrees of Freedom

Dean, M. P. M.; James, A. J. A.; Springell, R. S.; Liu, X.; Monney, C.; Zhou, K. J.; Konik, R. M.; Wen, J. S.; Xu, Z. J.; Gu, G. D.; Strocov, V. N.; Schmitt, T. and Hill, J. P. (2013). High-Energy Magnetic Excitations in the Cuprate Superconductor Bi₂Sr₂CaCu₂O_8+δ: Towards a Unified Description of Its Electronic and Magnetic Degrees of Freedom. Physical Review Letters, 110(14), article no. 147001.

DOI: https://doi.org/10.1103/PhysRevLett.110.147001

Abstract

We investigate the high-energy magnetic excitation spectrum of the high-T_c cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ (Bi-2212) using Cu L₃ edge resonant inelastic x-ray scattering. Broad, dispersive magnetic excitations are observed, with a zone boundary energy of ~300 meV and a weak dependence on doping. These excitations are strikingly similar to the bosons proposed to explain the high-energy ‘‘kink’’ observed in photoemission. A phenomenological calculation of the spin response, based on a parametrization of the the angle-resolved photoemission spectroscopy derived electronic structure and Yang-RiceZhang quasiparticles, provides a reasonable prediction of the energy dispersion of the observed magnetic excitations. These results indicate a possible unified framework to reconcile the magnetic and electronic properties of the cuprates and we discuss the advantages and disadvantages of such an approach.

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