Magnetic resonance in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$

Details Magnetic resonance in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$ Magnetic resonance in the model high-temperature superconductor HgBa$_2$CuO$_{4+δ}$

2008-10-31

arxiv.org/abs/0810.5759v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We present an inelastic neutron scattering study of the structurally simple single-layer compound HgBa$_2$CuO$_{4+\delta}$ close to optimal doping ($T_c \approx 96$ K). A well-defined antiferromagnetic resonance with energy $\omega_r = 56$ meV ($\approx 6.8 k_BT_c$) is observed below the superconducting transition temperature $T_c$. The resonance mode is energy-resolution limited and exhibits an intrinsic momentum width of about $0.2 \mathrm{\mathring{A}^{-1}}$, consistent with prior work on several other cuprates. However, the unusually large value of the mode energy implies a non-universal relationship between $\omega_r$ and $T_c$ across different families of cuprates.

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