arxiv: cond-mat/0002013 · v3 · submitted 2000-02-01 · ❄️ cond-mat.supr-con · cond-mat.str-el

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

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L. P. Regnault E. Schoenherr B. Keimer

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords excitationresonantspincacudeltaoverdopedconstantcontroversy

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An inelastic neutron scattering study of overdoped Bi_2Sr_2CaCu_2O_{8+\delta} $ (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+\delta} (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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Resonant Spin Excitation in an Overdoped High Temperature Superconductor

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