We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

Program

Pressure effects on physical properties of a selected Ce-based compound

lecture given by:

Daniel Staško

Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 8.1. 2020 from 14:10 

Vladimír Sechovský
On behalf of the DCMP and MGML

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.

[1] Haen, P.; Lejay, P.; Chevalier, B.; Lloret, B.; Etourneau, J.; Sera, M; J. Less-Common Met. 1985, 110, 321-325.
[2] Adroja, D. T.; del Moral, A.; de la Fuente, C.; Fraile, A.; Goremychkin, E. A.; Taylor, J. W.; Hillier, A. D.; Fernandez-Alonso, F.; Phys. Rev. Lett. 2012, 108, 216402.
[3] Kimura, N.; Ito, K.; Saitoh, K.; Umeda, Y.; Aoki, H.; Terashima, T.; Phys. Rev. Lett. 2005, 95, 247004.
[4] Sugitani, I.; Okuda, Y.; Shishido, H.; Yamada, T.; Thamhavel, A.; Yamamoto, E.; Matsuda, T. D.; Haga, Y.; Takeuchi, T.; Settai, R.; Onuki, Y.; J. Phys. Soc. Japan 2006, 75, 043703.