Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy

Abstract

The low-temperature electronic phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$, 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 SDW transition, as well as a possible incommensurate magnetic phase. All these phases coexist and compete with superconductivity, which is particularily strongly suppressed by the $C_4$-magnetic phase due to a strong reduction of the electronic entropy available for pairing in this phase.

5 pages, 4 figures

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