The resonant magnetic mode: a common feature of high-$T_C$ superconductors

TL;DR

This paper discusses the observation of a magnetic resonant mode in high-temperature superconductors, suggesting magnetic excitations play a key role in their superconducting mechanism, based on neutron scattering experiments across different cuprate materials.

Contribution

It provides experimental evidence of a universal magnetic resonant mode in various high-$T_c$ cuprates, supporting models linking magnetic excitations to superconductivity.

Findings

Detection of a sharp magnetic resonant mode below $T_c$ in Tl$_{2}$Ba$_{2}$CuO$_{6+eta}$

Resonant mode observed in multiple cuprate systems, indicating universality

Supports magnetic excitation-based theories of high-$T_c$ superconductivity

Abstract

Inelastic neutron scattering experiments in high-$T_c$ cuprates have evidenced a new magnetic excitation present in the superconducting state. In particular, recent experiments on single layer Tl$_{2}$Ba$_{2}$CuO$_{6+\delta }$, performed near optimum doping ($ T_{c} \sim 90$ K), provide evidence of a sharp magnetic resonant mode below $ T_{c}$, similar to previous reports on the YBCO and BSCCO bilayer systems. This result supports models that ascribe a key role to magnetic excitations in the mechanism of superconductivity.