- Milan Klicpera: Magnetic structure of UAu2Si2
- 22. 11. 2017, 14:30
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
The UT2Si2 compounds, where T is a transition metal element, have been attracting much interest owing to the variety of interesting phenomena such as magnetic ordering, superconductivity heavy-fermion states and hidden order. The magnetic structures of UT2Si2 compounds have been investigated, except for two cases: URu2Si2 and UAu2Si2.
URu2Si2 exhibits the so called hidden order transition [1-4] and has been a subject of research interest for more than thirty years. In contrast, UAu2Si2 has been investigated much less. A ferromagnetic state below 20 K was suggested in several reports [5-9]. However, detailed magnetic properties were not investigated mainly due to the absence of any single-crystalline sample.
We have prepared a UAu2Si2 single crystal of good quality and size to investigate the physical properties of this compound in detail. We confirmed UAu2Si2 crystallizes in the ThCr2Si2-type tetragonal structure (space group I4mmm), like most of UT2Si2 compounds. Further we investigated bulk physical properties by means of magnetization, specific heat, resistivity and thermal expansion measurements [10,11]. Recently, we performed also two neutron diffraction experiments at the Institut Laue-Langevin, Grenoble, to reveal the magnetic structure. The investigation of the magnetic structure of UAu2Si2 will be a subject of the seminar.
References:
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