Magnetic resonance in the model high-temperature superconductor HgBa₂CuO_4+δ

2008/10/31 by G. Yu, Guichuan Yu, Yangmu Li +22
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.0810.5759

4 pages, 4 figures

arxiv created 2008/10/31 · openalex publication_date 2008/10/31 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We present an inelastic neutron scattering study of the structurally simple single-layer compound HgBa₂CuO_4+δ close to optimal doping (T_c ≈ 96 K). A well-defined antiferromagnetic resonance with energy ω_r = 56 meV (≈ 6.8 k_BT_c) is observed below the superconducting transition temperature T_c. The resonance mode is energy-resolution limited and exhibits an intrinsic momentum width of about 0.2 \mathrm\mathringA^-1, consistent with prior work on several other cuprates. However, the unusually large value of the mode energy implies a non-universal relationship between ω_r and T_c across different families of cuprates.

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