Quantum mechanics

Electrical resistivity and conductivity

Spin (aerodynamics)

Antiferromagnetism

Ferromagnetism

Scattering

Inelastic scattering

Acoustics

Magnetic susceptibility

Lattice (music)

Thermodynamics

Physics

Brillouin zone

Inelastic neutron scattering

Kondo effect

Paramagnetism

Superconductivity

Condensed matter physics

npj Quantum Materials

The temperature dependence of the low-energy magnetic excitations in the spin-triplet superconductor UTe$_2$ was measured via inelastic neutron scattering in the normal and superconducting states. The imaginary part of the dynamic susceptibility follows the behavior of interband correlations in a hybridized Kondo lattice with an appropriate characteristic energy. These excitations are a lower-dimensional analogue of phenomena observed in other Kondo lattice materials, such that their presence is not necessarily due to dominance of ferromagnetic or antiferromagnetic correlations. The onset of superconductivity alters the magnetic excitations noticeably on the same energy scales, suggesting that these changes originate from additional electronic structure modification.

Symmetry of magnetic correlations in spin-triplet superconductor UTe2