Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates

Dean, M. P. M.; James, A. J. A.; Walters, A. C.; Bisogni, V.; Jarrige, I.; Hücker, M.; Giannini, E.; Fujita, M.; Pelliciari, J.; Huang, Y. B.; Konik, R. M.; Schmitt, T. and Hill, J. P. (2014). Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates. Physical Review B, 90(22), article no. 220506(R).

DOI: https://doi.org/10.1103/PhysRevB.90.220506

Abstract

The cuprate high temperature superconductors exhibit a pronounced trend in which the superconducting transition temperature T_c increases with the number of CuO₂ planes n in the crystal structure. We compare the magnetic excitation spectrum of Bi_2+xSr_2−xCuO_6+δ (Bi-2201) and Bi₂Sr₂Ca₂Cu₃O_10+δ (Bi-2223), with n = 1 and 3, respectively, using Cu L₃-edge resonant inelastic x-ray scattering. Near the antinodal zone boundary we find the paramagnon energy in Bi-2223 is substantially higher than that in Bi-2201, indicating that multilayer cuprates host stronger effective magnetic exchange interactions, providing a possible explanation for the T_c vs n scaling. In contrast, the nodal direction exhibits very strongly damped, almost nondispersive excitations. We argue that this implies that the magnetism in the doped cuprates is partially itinerant in nature.

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