Paramagnons and high-temperature superconductivity in mercury-based cuprates

Abstract

We present a comparative study of magnetic excitations in the first two Ruddlesden-Popper members of the Hg-family of high-temperature superconducting cuprates, which are chemically nearly identical and have the highest critical temperature ($T_{\mathrm{c}}$) among all cuprate families. Our inelastic photon scattering experiments reveal that the two compounds' paramagnon spectra are nearly identical apart from an energy scale factor of $\sim 130\%$ that matches the ratio of $T_{\mathrm{c}}$'s, as expected in magnetic Cooper pairing theories. By relating our observations to other cuprates, we infer that the strength of magnetic interactions determines how high $T_{\mathrm{c}}$ can reach. Our finding can be viewed as a magnetic analogue of the isotope effect, thus firmly supporting models of magnetically mediated high-temperature superconductivity.

arXiv comment6 pages, 4 figures, SM available via link in pdf

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• Mechanism of Superconductivity in the Hubbard Model at Intermediate Interaction Strength
• Connecting the one-band and three-band Hubbard models of cuprates via spectroscopy and scattering experiments
• Ab initio quantum many-body description of superconducting trends in the cuprates
• Low-energy quasi-circular electron correlations with charge order wavelength in ${\text{Bi}}_2{\text{Sr}}_2\text{Ca}{\text{Cu}}_2{\text{O}}_{8+\delta }$
• Unprecedentedly large gap in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ with the highest $T_c$ at ambient pressure
• Quantum oscillations in the hole-doped cuprates and the confinement of spinons
• One- and two-particle correlation functions in the cluster perturbation theory for cuprates
• Paramagnon dispersion and damping in doped Na${}_x$Ca${}_{2-x}$CuO${}_2$Cl${}_2$
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• Spin and bond-charge excitation spectra in correlated electron systems near antiferromagnetic phase
• Oxygen on-site Coulomb energy in Pr${}_{1.3-x}$La${}_{0.7}$Ce${}_x$CuO${}_4$ and Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and its relation with Heisenberg exchange
• Detection of a two-phonon mode in a cuprate superconductor via polarimetric RIXS
• Effect of the Coulomb repulsion and oxygen level on charge distribution and superconductivity in the Emery model for cuprates superconductors
• Ag(II) as spin super-polarizer in metal fluoride clusters
• Superconducting phase diagram of multi-layer square-planar nickelates
• Emergence of interfacial magnetism in strongly-correlated nickelate-titanate superlattices
• Bosonic excitation spectra of superconducting $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{r}}_2\mathrm{CaC}{\mathrm{u}}_2{\mathrm{O}}_{8+\delta }$ and $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{6+\mathrm{x}}$ extracted from scanning tunneling spectra
• Spin singlet and quasiparticles excitations in cuprate superconductors
• Emergence of Fermi-liquid and BCS physics in overdoped cuprates
• Order by projection in single-band Hubbard model: a DMRG study