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

Liran Wang, F. Hardy, A. Böhmer +3

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…