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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.32: Poster
Wednesday, March 19, 2025, 15:00–18:00, P4
Strain dependance of the antiferromagnetic transition of Ca1−xSrxCo2As2 with a substitution induced structural collapse — •Michael Paul, Maik Golombiewski, Teslin R. Thomas, N.S. Sangeetha, Andreas Kreyssig, and Anna E. Böhmer — Experimentalphysik IV, Ruhr-Universität Bochum, 44801 Bochum, Germany
The tetragonal structure of SrCo2As2 undergoes a gradual collapse with the substitution of Sr by Ca atoms. This collapse is accompanied by the emergence of antiferromagnetic order with a transition temperature TN of up to 55 K [1]. It has been shown that TN can be tuned with biaxial strain that is created by cooling a thin Ca1−xSrxCo2As2 sample that is glued to a quartz substrate [2].
A more controlled application of uniaxial force to the sample can be achieved with the use of the cryogenic stress cell Razorbill FC100. The modification of the antiferromagnetic transition of Ca1−xSrxCo2As2 is investigated by applying uniaxial stress to the sample with this
device.
We acknowledge the support by the Deutsche Forschungsgemeinschaft
(DFG) under CRC/TRR 288 (Project A02).
[1] N. S. Sangeetha et al., Phys. Rev. Lett. 119, 257203 (2017);
[2] T. R. Thomas et al., in preparation
Keywords: Ca1-xSrxCo2As2; strain; elastoresistance