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Emergent topological spin structures in the centrosymmetric cubic perovskite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
The authors unveil topological spin structures composed of skyrmion strings in a cubic centrosymmetric iron oxide that provides the missing experimental link between centrosymmetric lattices and a rich variety of helimagnetic order. This is the first observation of a three-dimensional topological spin texture in a bulk perovskite-type oxide, one of …