We have measured Hall effect, magnetotransport and magnetostriction on the field induced phases of single crystalline UPt2Si2 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 5f 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.
@article{arxiv.1610.01212,
title = {Field induced Lifshitz transition in UPt$_2$Si$_2$: Fermi surface under extreme conditions},
author = {D. Schulze Grachtrup and N. Steinki and S. Süllow and Z. Cakir and G. Zwicknagl and Y. Krupko and I. Sheikin and M. Jaime and J. A. Mydosh},
journal= {arXiv preprint arXiv:1610.01212},
year = {2017}
}