The crystal changes its internal geometry like a building frame that slightly twists during an earthquake. In the manganese-gallium alloy (Mn₃Ga), at around 485 Kelvin (about 212°C), a magnetic transition occurs: the atoms align into an antiferromagnetic order, where neighboring magnetic moments point in opposite directions. Upon further cooling to room temperature, the crystal lattice distorts slightly — from hexagonal to monoclinic, as if a rectangular box were gently squeezed from one corner.

This shift alters the arrangement of Weyl points — special points in momentum space where electrons behave like massless particles, akin to light. In the initial state, the Weyl points form a type-II configuration, and after the transition, they adopt a different configuration. Along with this, the anomalous Hall effect changes dramatically: the transverse electric field that arises without an external magnetic field becomes noticeably stronger, and a topological Hall effect emerges — an additional contribution linked to the nontrivial texture of the magnetization.

The practical value lies in the fact that the switching occurs at temperatures close to room temperature and is controlled simply by changing the temperature. This opens the door to spintronic devices, where information is encoded not by charge but by the electron's spin. The material Mn₃Ga is already known for its antiferromagnetic properties, and now it becomes a candidate for creating switches and magnetic field sensors.