Physicists at Rutgers University have identified a quantum state that fits into none of the four familiar categories of solid, liquid, gas, or plasma. Reported in Science Advances, the discovery emerged not from a single material, but from the boundary where two exotic ones meet.

Eu₂Ir₂O₇ was combined with Dy₂Ti₂O₇. While Eu₂Ir₂O₇ is a Weyl semimetal in which electrons conduct through Weyl fermions, an exotic form of particle-like electronic excitation, Dy₂Ti₂O₇ is a magnetic insulator referred to as spin ice, in which magnetic moments order similarly to how hydrogen atoms form ice.

The two........

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