- Jan Prokleška: Ferromagnetic criticality in uranium compounds
- 8. 6. 2016, 14:50
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
The critical behavior of itinerant ferromagnets close to the onset of the long range order is a subject of intensive experimental and theoretical studies. In particular the evolution of this phase transition at low temperatures is being discussed including the possible scenarios in the zero temperature limit where quantum phase transition may take place. At low temperatures and in clean systems two scenarios avoiding single quantum critical point are possible – the ferromagnetic fluctuations become critical and the ferromagnet-to-paramagnet transition is of first order, or inhomogeneous magnetic phases may appear between the uniform ferromagnetic phase and the paramagnetic phase. Global detailed investigation of both options is rather rare in literature and still open problem, high quality samples and very rigorous experiment realization are necessary in order to obtain unambiguous results.
The talk will be devoted to the discussion of experimental observations of the critical ferromagnetic behavior in uranium based intermetallic compounds. In particular, the novel findings in UCoGa, U(Co1-x,Rux)Al and U4Ru6Ge7 compounds will be presented and put into the context of earlier published data on the UCoAl relatives, URhAl, URhGe, UCoGe and U3P4 compounds.
The observed phenomena will be discussed in detail, particular attention will be paid to the comparison across the hexagonal UTX group of compounds, the origin of majority of case-related uranium compounds.