Electronic spin susceptibilities and superconductivity in HgBa${}_2$CuO${}_{4+\delta }$ from nuclear magnetic resonance

Abstract

Nuclear magnetic resonance (NMR) experiments on single crystals of HgBa${}_2$CuO${}_{4+\delta }$ are presented that identify two distinct temperature-dependent spin susceptibilities: one is due to a spin component that is temperature-dependent above the critical temperature for superconductivity ($T_{\mathrm{c}}$) and reflects pseudogap behavior; the other is Fermi-liquid-like in that it is temperature independent above $T_{\mathrm{c}}$ and vanishes rapidly below $T_{\mathrm{c}}$. In addition, we demonstrate the existence of a third, hitherto undetected spin susceptibility: it is temperature independent at higher temperatures, vanishes at lower temperatures (below $T_0\ne T_{\mathrm{c}}$), and changes sign near optimal doping. This susceptibility either arises from the coupling between the two spin components, or it could be given by a distinct third spin component.

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• A different NMR view of cuprate superconductors
• Unconventional ${}^{17}$O and ${}^{63}$Cu NMR shift components in cuprate superconductors
• Uniform hole doping in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ studied by ${}^{63}$Cu NMR
• Magnetic susceptibility of optimally doped HgBa${}_2$CuO${}_{4+\delta }$
• Cu hyperfine coupling constants of HgBa${}_2$Ca​Cu${}_2$O${}_{6+\delta }$
• Hidden Universal Metal in Cuprate Superconductors