AI Article Synopsis
- Magnetic fluctuations play a key role in superconductivity across various types of materials, but recent discoveries have raised questions about this view, particularly regarding nodeless superconductivity.
- A study using inelastic neutron scattering has detailed the magnetic excitations in superconducting materials, revealing distinct low-energy and high-energy behaviors that indicate a complex relationship between magnetism and superconductivity.
- The findings suggest that high-energy magnetic excitations are linked to quasiparticles from heavy electron bands, thereby enhancing our understanding of how magnetism contributes to superconductivity in these materials.
Article Abstract
Magnetic fluctuations is the leading candidate for pairing in cuprate, iron-based, and heavy fermion superconductors. This view is challenged by the recent discovery of nodeless superconductivity in , and calls for a detailed understanding of the corresponding magnetic fluctuations. Here, we mapped out the magnetic excitations in superconducting (S-type) using inelastic neutron scattering, finding a strongly asymmetric dispersion for , which at higher energies evolves into broad columnar magnetic excitations that extend to . While low-energy magnetic excitations exhibit marked three-dimensional characteristics, the high-energy magnetic excitations in are almost two-dimensional, reminiscent of paramagnons found in cuprate and iron-based superconductors. By comparing our experimental findings with calculations in the random-phase approximation,we find that the magnetic excitations in arise from quasiparticles associated with its heavy electron band, which are also responsible for superconductivity. Our results provide a basis for understanding magnetism and superconductivity in , and demonstrate the utility of neutron scattering in probing band renormalization in heavy fermion metals.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10644953 | PMC |
| http://dx.doi.org/10.1038/s41535-021-00358-x | DOI Listing |
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