Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: Correlated Electrons: Other Materials
TT 27.11: Vortrag
Dienstag, 19. März 2024, 12:15–12:30, H 3010
Elastoresistance of the itinerant antiferromagnet Ca1−xSrxCo2−yAs2: Analysis of different symmetry channels — •Teslin Rose Thomas, N. S. Sangeetha, Sven Graus, Max Brückner, Andreas Kreyssig, and Anna E. Böhmer — Lehrstuhl für Experimentalphysik IV, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum
It is becoming common to study correlated electron systems using elastoresistance, the change in electrical resistance under strain. An interesting aspect of this technique is the possibility of applying symmetry-selective strain to the system under investigation. In this study, we present the method of uniaxial/biaxial elastoresistance and how it can be applied to study various symmetry channels. The method is applied to the itinerant antiferromagnet Ca1−xSrxCo2−yAs2 that shows a collapsed-to-uncollapsed tetragonal structural crossover and interesting magnetic orderings upon Sr substitution [1, 2]. We observe prominent and diverse signals in the different symmetry channels, especially a large A1g (non-symmetry breaking) elastoresistance.
We acknowledge support from the Deutsche Forschungsgemeinschaft (DFG) under CRC/TRR 288 (Project A02).
[1] N. S. Sangeetha et al., Phys. Rev. Lett. 119 (2017) 257203
[2] Bing Li et al., Phys. Rev. B 100 (2019) 024415
Keywords: Correlated electron systems; Itinerant antiferromagnetism; Elastoresistance; Strain tuning