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Ultrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides

TitleUltrafast observation of critical nematic fluctuations and giant magnetoelastic coupling in iron pnictides
Publication TypeJournal Article
Year of Publication2014
AuthorsPatz, A, Li, TQ, Ran, S, Fernandes, RM, Schmalian, J, Bud'ko, SL, Canfield, PC, Perakis, IE, Wang, JG
JournalNature Communications
Volume5
Pagination3229
Date Published02
Type of ArticleArticle
ISBN Number2041-1723
Accession NumberWOS:000332665700004
Keywordsanisotropy, arsenide superconductor, bafe2as2, detwinned ba(fe1-xcox)(2)as-2, dynamics, order, state, transition
Abstract

mplex refractive index, displays a characteristic two-step recovery absent in the isotropic response. The fast recovery appears only in the magnetically ordered state, whereas the slow one persists in the paramagnetic phase with a critical divergence approaching the structural transition temperature. The dynamics also reveal a gigantic magnetoelastic coupling that far exceeds electron-spin and electron-phonon couplings, opposite to conventional magnetic metals.

DOI10.1038/ncomms4229
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