Two characteristic energies in the low-energy antiferromagnetic response of the electron-doped high-temperature superconductor Nd_2-xCe_xCuO_4+δ

2008/03/22 by G. Yu, Guichuan Yu, Yu, G. +12
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.0803.3250

5 pages, 3 figures

openalex publication_date 2008/03/22 · arxiv created 2008/11/29 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

Inelastic neutron scattering for Nd_2-xCe_xCuO_4+δ near optimal doping (x ≈ 0.155, T_c = 25 K) reveals that the dynamic magnetic susceptibility at the antiferromagnetic zone center exhibits two characteristic energies in the superconducting state: ω₁ ≈ 6.4 meV and ω₂ ≈ 4.5 meV. These two magnetic energies agree quantitatively with the B_1g / B_2g and A_1g features previously observed in electronic Raman scattering, where the former is believed to indicate the maximum electronic gap and the origin of the smaller A_1g feature has remained unexplained. The susceptibility change upon cooling into the superconducting state is inconsistent with previous claims of the existence of a magnetic resonance mode near 10 meV, but consistent with a resonance at ω₂.

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