Abstract
Two of the most striking and yet unresolved manifestations of the hidden order (HO) in are associated, on one hand, with the double-step metamagnetic transitions and, on the other, with the giant anomalous Nernst signal. Both are observed when a magnetic field is applied along the -axis. Here, we provide for the first time a unified understanding of these puzzling phenomena and the related field–temperature () phase diagram. We demonstrate that the HO phase at finite fields can be explained with a chiral spin density wave, assuming that the zero-field HO contains only the time-reversal symmetry preserving component. We argue that the presence of the field-induced chiral HO can be reflected in a distinctive non-linear dependence of the Kerr angle, when a Kerr experiment is conducted for finite fields. This fingerprint can be conclusive for the possible emergence of chirality in the HO.
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