Symmetry-decomposed elastoresistance of <i>A</i>Fe<sub>2</sub>As<sub>2</sub> (<i>A</i> = K, Rb, Cs)
ORAL
Abstract
We present elastoresistance measurements of the iron-based superconductors AFe2As2 (A = K, Rb, Cs) in the A1g, B1g and B2g symmetry channels. These materials have strong electronic correlations and show a crossover between a low-temperature coherent heavy Fermi liquid and a high-temperature regime of reduced quasiparticle coherence [1,2]. Neutralizing the large thermal expansion of these materials by means of a piezoelectric strain cell is found to be essential to obtaining intrinsic results. All three materials have a significant in-plane symmetric A1g response, consistent with the coherence-incoherence crossover.
[1] F. Hardy et al., Phys. Rev. B 94, 205113 (2016)
[2] F. Hardy et al., Phys. Rev. Lett. 111, 027002 (2013)
[3] P. Wiecki et al., Phys. Rev. Lett. accepted (2020)
[1] F. Hardy et al., Phys. Rev. B 94, 205113 (2016)
[2] F. Hardy et al., Phys. Rev. Lett. 111, 027002 (2013)
[3] P. Wiecki et al., Phys. Rev. Lett. accepted (2020)
*We acknowledge support by the Helmholtz Association under Contract No. VH-NG-1242. The contribution from M. Merz was supported by the Karlsruhe Nano Micro Facility.
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Presenters
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Paul Wiecki
- Karlsruhe Institute of Technology
- Karlsruhe Institute of Technology, Institut für Festkörperphysik