A hidden U(1) symmetry emerges at the first-order transition between nematic and charge-C4 orders in iron pnictides, giving a Goldstone mode that softens excitations and explains phonon data.
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Nematicity in iron pnictides: phase competition and emergent symmetry
A hidden U(1) symmetry emerges at the first-order transition between nematic and charge-C4 orders in iron pnictides, giving a Goldstone mode that softens excitations and explains phonon data.