Field induced Lifshitz transition in UPt$_2$Si$_2$: Fermi surface under   extreme conditions
  We have measured Hall effect, magnetotransport and magnetostriction on the field induced phases of single crystalline UPt$_2$Si$_2$ in magnetic fields up to 60\,T at temperatures down to 50\,mK. For the magnetic field applied along the $c$ axis we observe strong changes in the Hall effect at the phase boundaries. From a comparison to band structure calculations utilizing the concept of a dual nature of the uranium 5$f$ electrons, we find evidence for field induced topological changes of the Fermi surface due to at least one Lifshitz transition. Furthermore, we find a unique history dependence of the magnetotransport and magnetostriction data, indicating that the Lifshitz type transition is of a discontinuous nature, as predicted for interacting electron systems. 
D. Schulze Grachtrup, N. Steinki, S. S\"ullow, Z. Cakir, G. Zwicknagl,   Y. Krupko, I. Sheikin, M. Jaime, J.A. Mydosh
cond-mat.str-el