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We report 23 Na nuclear magnetic resonance (NMR) measurements of the Mott insulator with strong spin-orbit interaction Ba 2 NaOsO 6 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. [ABSTRACT FROM AUTHOR]

Abstract: Many important advances in the physics of strongly correlated electron systems have been driven by the development of new materials: for instance the filled skutterudites ( metal, alkaline earth, lanthanide, or actinide; , Ru, or Os; , As, or Sb), certain lanthanide and actinide intermetallic compounds such as and (, Rh, or Ir), and layered oxypnictides and related materials. These types of complex multinary d- and f-electron compounds have proven to be a vast reservoir of novel strongly correlated electron ground states and phenomena. In these materials, the occurrence of such a wide range of ground states and phenomena arises from a delicate interplay between competing interactions that can be tuned by partial or complete substitution of one element for another, as well as the application of pressure, and magnetic fields, resulting in rich and complex electronic phase diagrams in the hyperspace of temperature, chemical composition, pressure and magnetic field. It seems clear that this type of “materials driven physics” will continue to play a central role in the development of the field of strongly correlated electron systems in the future, through the discovery of new materials that exhibit unexpected phenomena and experiments on known materials in an effort to optimize their physical properties and test relevant theories. [Copyright &y& Elsevier]

Abstract: Torque magnetisation data are presented which probe the line of second order phase transitions approaching the Bose–Einstein condensation (BEC) quantum critical point (QCP) in . Results reveal that as the temperature is lowered, the phase transition is increasingly dominated by quantum rather than thermal fluctuations near the QCP. [Copyright &y& Elsevier]