Quantum magnetic blocks cancel key NbFe2 point

Researchers have, for the first time, fully characterized a phenomenon that obscures a fundamental point in the study of magnetism, the ferromagnetic quantum critical point, within the metallic compound NbFe2. Using facilities Laue Langevin in Grenoble, France and the Isis Neutron Source in Didcot, UK, the team demonstrated that this wave arises from the arrangement of ferrimagnetic building blocks with antiparallel ferromagnetic sheets. This discovery reveals an unconventional magnetic order emerging from underlying quantum criticality, a phenomenon important for understanding non-Fermi liquid states and unconventional superconductivity. The first fully refined example of a longitudinal spin-density wave obscuring a ferromagnetic quantum critical point has been observed in the compound NbFe₂ by an international team of scientists. This masking effect, where a modulated magnetic order hides a fundamental transition, is rare and complicates the search for elusive quantum critical points in materials. Researchers determined the structure of this wave by meticulously varying the…