  The interplay between strong electron correlation and band topology is at the
forefront of condensed matter research. As a direct consequence of correlation,
magnetism enriches topological phases and also has promising functional
applications. However, the influence of topology on magnetism remains unclear,
and the main research effort has been limited to ground state magnetic orders.
Here we report a novel order above the magnetic transition temperature in
magnetic Weyl semimetal (WSM) CeAlGe. Such order shows a number of anomalies in
electrical and thermal transport, and neutron scattering measurements. We
attribute this order to the coupling of Weyl fermions and magnetic fluctuations
originating from a three-dimensional Seiberg-Witten monopole, which
qualitatively agrees well with the observations. Our work reveals a prominent
role topology may play in tailoring electron correlation beyond ground state
ordering, and offers a new avenue to investigate emergent electronic properties
in magnetic topological materials.
