Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Correlated Electrons: Poster Session
TT 21.5: Poster
Mittwoch, 7. September 2022, 15:00–18:00, P1
Elastoresistance of Eu2T2P2 (T=Fe, Ru, Co) systems close to a collapsed tetragonal phase transition — •Teslin Rose Thomas1, N. S. Sangeetha1, Thanh Duc Nguyen2, Julian Reusch2, Marius Peters2, Kristin Kliemt2, Cornelius Krellner2, and Anna E. Böhmer1 — 1Lehrstuhl für Experimentalphysik IV, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum — 2Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main
Manipulation of the properties of materials by applying anisotropic strain is an increasingly common method used in the study of correlated electron materials. In particular, the nematic state of several unconventional superconductors has been studied intensively using elastoresistance as a probing tool. In the current project, we employ elastoresistance to study the state close to the uncollapsed to collapsed- tetragonal transitions in Eu2T2P2 (T=Fe, Ru, Co) and CaCo2As2 122 systems. In contrast to investigations of nematicity, where the response to uniaxial strain is studied, we apply bi-axial strain which is by symmetry well suited. The corresponding elastoresistance is compared for the different compounds and at different temperatures. The results are then compared with the temperature and pressure dependence of lattice constants, which show the tetragonal collapse.
We acknowledge support from the German Research Foundation (DFG) under CRC/TRR 288 (Project A02).