Field-tuned quasiparticles and electronic structure in heavy-fermion YbNi4P2
Researchers used quantum oscillation measurements on heavy-fermion YbNi4P2 under high magnetic fields to study its electronic structure and quasiparticle properties. They found that the quasiparticle mass decreases continuously with increasing field, suggesting Kondo singlet suppression. A sharp change in oscillation frequencies at 17 T indicates an abrupt transition in the electronic structure, providing insight into tuning these correlated electron systems.