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Resonant Spin Excitation in an Overdoped High Temperature Superconductor

H. He·Y. Sidis·P. Bourges·G. D. Gu·A. Ivanov·N. Koshizuka·B. Liang·C. T. Lin·L. P. Regnault·E. Schoenherr·B. Keimer
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Abstract

An inelastic neutron scattering study of overdoped Bi_2Sr_2CaCu_2O_{8+δ} $ (T_c = 83 K) has revealed a resonant spin excitation in the superconducting state. The mode energy is E_res=38 meV, significantly lower than in optimally doped Bi_2Sr_2CaCu_2O_{8+δ} (T_c = 91 K, E_ res =43 meV). This observation, which indicates a constant ratio E_res /k_B T_c \sim 5.4, helps resolve a long-standing controversy about the origin of the resonant spin excitation in high-temperature superconductors.

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H. He, Y. Sidis, P. Bourges, G. D. Gu, A. Ivanov, N. Koshizuka, B. Liang, C. T. Lin, L. P. Regnault, E. Schoenherr, B. Keimer. 2001-02-13. Resonant Spin Excitation in an Overdoped High Temperature Superconductor. https://doi.org/10.1103/physrevlett.86.1610

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