Peculiar structural transitions in UIrSi3
RTX3 compounds crystallizing in the non-centrosymmetric BaNiSn3-type structure reveal frequently diverse and exotic physical properties. UIrSi3 is one of the only two UTX3 isostructural analogs. A complex magnetic phase diagram and most probably a complex magnetic structure make UIrSi3 a prominent system for detailed microscopic investigations. Besides intensive investigations of macroscopic properties, we performed neutron diffraction experiments on single crystal employing CYCLOPS and D10 diffractometers. Except the information on magnetic structure of the compound, the obtained data showed a stable BaNiSn3-type structure down to low temperature. Surprisingly, our recent powder data from D7 experiment reveal a strong evolution of nuclear signal with temperature. A high temperature BaNiSn3-structure peaks remain in diffraction patterns down to 2 K, however a new set of peaks is revealed cooling the sample below 60 K. These peaks shift with further temperature decrease to higher angles and another set of peaks appears below 35 K. We propose an experiment employing D1B diffractometer to inspect these structural changes and their probable connection to magnetic order in detail.
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VALENTA Jaroslav; CERMAK Petr; Fuminori HONDA; KLICPERA Milan; PUENTE ORENCH Ines and VALISKA Michal. (2020). Peculiar structural transitions in UIrSi3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-646
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