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Complex phase diagram of Ba1-xNaxFe2As2: A multitude of phases striving for the electronic entropy

TitleComplex phase diagram of Ba1-xNaxFe2As2: A multitude of phases striving for the electronic entropy
Publication TypeJournal Article
Year of Publication2016
AuthorsWang, L, Hardy, F, Bohmer, AE, Wolf, T, Schweiss, P, Meingast, C
JournalPhysical Review B
Volume93
Pagination014514
Date Published01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000368481300014
Keywordshigh-temperature superconductivity, iron pnictides, nematic order
Abstract

The low-temperature electronic phase diagram of Ba1-xNaxFe2As2, obtained using high-resolution thermal-expansion and specific-heat measurements, is shown to be considerably more complex than previously reported, containing nine different phases. Besides the magnetic C-2 and reentrant C-4 phases, we find evidence for an additional, presumably magnetic, phase below the usual spin-density-wave transition, as well as a possible incommensurate magnetic phase. All these phases coexist and compete with superconductivity, which is particularly strongly suppressed by the C-4-magnetic phase due to a strong reduction of the electronic entropy available for pairing in this phase.

DOI10.1103/PhysRevB.93.014514
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