Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors

R. M. Fernandes, S. A. Kivelson, E. Berg

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Abstract

Recent experiments in optimally hole-doped iron arsenides have revealed a novel magnetically ordered ground state that preserves tetragonal symmetry, consistent with either a charge-spin density wave (CSDW), which displays a nonuniform magnetization, or a spin-vortex crystal (SVC), which displays a noncollinear magnetization. Here we show that, similarly to the partial melting of the usual stripe antiferromagnet into a nematic phase, either of these phases can also melt in two stages. As a result, intermediate paramagnetic phases with vestigial order appears: a checkerboard charge density wave for the CSDW ground state, characterized by an Ising-like order parameter, and a remarkable spin-vorticity density wave for the SVC ground state - a triplet d-density wave characterized by a vector chiral order parameter. We propose experimentally detectable signatures of these phases, show that their fluctuations can enhance the superconducting transition temperature, and discuss their relevance to other correlated materials.

Original languageEnglish (US)
Article number014511
JournalPhysical Review B
Volume93
Issue number1
DOIs
StatePublished - Jan 19 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

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