- Daniel Staško: Pressure effects on physical properties of a selected Ce-based compound
- 8. 1. 2020, 14:10
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
CeTX3 compounds stay in the foreground of interest for their frequently unusual and exotic physical properties, e.g. heavy-fermion antiferromagnetic ordering, valence fluctuations (CeRuSi3 [1]), complex magnetic structures, so-called vibron quasi-bound state (CeCuAl3 [2]), superconductivity (CeCoSi3 [1]) or pressure-induced superconductivity (CeRhSi3 [3] and CeIrSi3 [4]). CeRhSi3 and CeIrSi3 order antiferromagnetically below 1.6 K and 5 K, respectively, and do not show any sign of transition to superconducting state in ambient pressure. Surprisingly, hydrostatic pressure of 1.2 GPa and 1.8 GPa, respectively, induces superconductivity in these compounds [3,4]. A number of studies searching for the pressure-induced superconductivity in other isostructural CeTX3 compounds (the ordered non-centrosymetric BaNiSn3-type of tetragonal structure) has been conducted. One of the compounds, to which a significant attention has been paid, is CeCuAl3. Previous studies were conducted under pressure of up to 8 GPa at temperature down to 2 K, revealing no sign of pressure-induced SC in this compound. We highlight that CeCuAl3 attracted a considerable attention as well due to the presence of so called vibron state (and its sensitivity to doping).
Utilizing Bridgman-type pressure cells we aim to study transport properties of CeRhSi3 and CeCuAl3 in extreme pressure (> 12 GPa) and at very-low-temperature (< 50 mK). We present the results of respective single crystals characterization followed by our recent high pressure experimental data. Simultaneously, the complexness of high pressure experiments motivated us to study the high-pressure exchange media in detail. We present the results of the fundamental properties investigation on three exchange media from the Daphne family, including the newest Daphne 7575.
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