Quantum Material Reveals a Secret Family of Magnetic Phases

A family of materials known as lanthanide antimonide tellurides is a hotbed for physics research, offering a rich platform to explore the interplay between magnetism, topology, and electronic behaviour.

Researchers focused on a specific compound, GdSb₀.₄₆Te₁.₄₈, an ideal example of an antiferromagnetic (AFM) topological semimetal. In AFM materials, the tiny magnetic 'spins' of atoms align in an alternating, antiparallel pattern, cancelling out any bulk magnetism.

By applying a high magnetic field and measuring the material's electrical and magnetic responses, the team uncovered a series of previously unseen magnetic phases. These newly discovered states, labelled PP-4 to PP-7, are also thought to be antiferromagnetic, but with different internal spin configurations.

The study suggests this remarkable diversity of magnetic phases is due to a property called strong magnetocrystalline anisotropy, where the material's magnetic properties are highly dependent on its internal crystal direction.