In the vicinity of instabilities or phase transitions in correlated electron systems, small changes of pressure or temperature can cause astonishing changes in the electronic ground state and the physical properties of these materials, affecting their behaviour in a fundamental way. High pressure experimental methods are, however, often limited to resolving atomic structures. A promising alternative experimental route is nuclear magnetic resonance spectroscopy (NMR), which is widely used in physics, chemistry and biology. Unfortunately, design restrictions, when adopted for diamond anvil cells (DACs), and hence low sensitivities rendered an application of NMR in high pressure sciences unfeasible for several decades. Recent developments of magnetic flux tailoring NMR methods however, increased the range of accessible pressures to well above 150 GPa[1].
In this talk I will present our latest results from the field of in-situ high pressure NMR in DACs [2] as well as novel developments in our ongoing efforts of trace-element detection in ultra small samples[3].
[1] Meier T. et al., Pressure-Induced Hydrogen-Hydrogen Interaction in Metallic FeH Revealed by NMR. Physical Review X, 9(3), 031008. (2019).
[2] Fu, Y. et al. Parts-per-billion Trace Element Detection in Anhydrous Minerals by Nano-scale NMR Spectroscopy., submitted, ArXiv (2024).
[3] Zhou D. et al. Evidence for Room-temperature Superionicity in Lanthanum superhydride, in preparation (2024)
 

high pressure, NMR, trace elements, superionicity