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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Magnetism – General
TT 3.12: Talk
Monday, March 17, 2025, 12:30–12:45, H32
Strain-tuning of magnetic properties of Ca1−xSrxCo2−yAs2 and elastoresistance measurements in different symmetry channels — •Teslin Rose Thomas, Michael Paul, N. S. Sangeetha, Sven Graus, Max Brückner, Andreas Kreyssig, and Anna E. Böhmer — Experimentalphysik IV, Ruhr-Universität Bochum, 44801 Bochum, Germany
The Ca1−xSrxCo2−yAs2 system belongs to the well-studied ThCr2Si2 structural family where Sr substitution induces a crossover from a collapsed tetragonal (cT) phase to an uncollapsed tetragonal (ucT) phase, along with different magnetic anisotropies [1,2].
In this study, we investigate how the cT-ucT crossover and the associated magnetic orders respond to in-plane symmetric and asymmetric strain in different configurations. We show that large in-plane symmetric strain can effectively tune the magnetic properties of the system. We also find a significant response of the resistance to in-plane symmetric strain with a temperature dependence that varies dramatically based on the doping level. The resistance response to symmetric strain dominates the response to asymmetric strain.
We acknowledge support from the Deutsche Forschungsgemeinschaft (DFG) under CRC/TRR 288 (Project A02).
[1] N. S. Sangeetha et al., Phys. Rev. Lett. 119, 257203 (2017).
[2] Bing Li et al., Phys. Rev. B 100, 024415 (2019).
Keywords: Correlated electron systems; Itinerant antiferromagnetism; Elastoresistance; Strain tuning