At temperatures near absolute zero, some magnetic materials transition into an exotic phase of matter known as a quantum spin liquid, where the spin distribution lacks order. To understand the behavior of these materials, researchers study model systems called quantum spin chains that share properties with quantum spin liquids. Quantum spin chains can sustain certain quasiparticles—whose interactions physicists want to better understand. Now, Kirill Povarov of the Swiss Federal Institute of Technology, Zurich, and colleagues make the first observation of a predicted interaction between certain quasiparticles in the material [1].\
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