Spin excitations in the candidate Weyl semimetal EuCuAs

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Very recently, EuCuAs was proposed as an example of a topological semimetal. Our measurements on Wish show that the Eu magnetic structure is incommensurate with a propagation vector q = (0, 0, 4.1). This was unexpected, as ab inito calculations had predicted a collinear antferromagnetic order. It is a very interesting discovery because it means that the conduction states experience a time-reversal-symmetry-breaking interaction, which could create a pair of Weyl points in the electronic band...
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