"Phase diagram of Ba2 NaOsO6, a Mott insulator with strong spin orbit interactions"

W.Liu: R.Cong, E.Garcia, A.P.Reyes, H.O.Lee, I.R.Fisher, V.F.Mitrović; Physica B: Condensed Matter, 05/01/18.

Additional Authors: R.Cong, E.Garcia, A.P.Reyes, H.O.Lee, I.R.Fisher, V.F.Mitrović

Abstract:

We report 23Na nuclear magnetic resonance (NMR) measurements of the Mott insulator with strong spin-orbit interaction Ba2NaOsO6 as a function of temperature in different magnetic fields ranging from 7 T to 29 T. The measurements, intended to concurrently probe spin and orbital/lattice degrees of freedom, are an extension of our work at lower fields reported in Lu et al. (2017) [1]. We have identified clear quantitative NMR signatures that display the appearance of a canted ferromagnetic phase, which is preceded by local point symmetry breaking. We have compiled the field temperature phase diagram extending up to 29 T. We find that the broken local point symmetry phase extends over a wider temperature range as magnetic field increases.