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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Fe-based Superconductors

TT 34.3: Vortrag

Mittwoch, 29. März 2023, 12:00–12:15, HSZ 103

Superconductivity of CaKFe4As4 under anisotropic strainsB. Zúñiga Céspedes1, A. Valadkhani2, S. Mandloi1, M. Xu3,4, J. Schmidt3,4, S. L. Bud’ko3,4, P. C. Canfield3,4, A. P. Mackenzie1,5, R. Valentí2, and •E. Gati11MPI CPfS, 01187 Dresden, DE — 2Inst. for Theor. Physics, Goethe University, 60438 FFM, DE — 3Ames Lab, US DOE, Ames, IA 50011, USA — 4Dept. of Physics and Astronomy, Iowa State Uni, Ames, IA 50011, USA — 5Scottish Universities Physics Alliance, School of Physics and Astronomy, Uni of St Andrews, UK

CaKFe4As4 is an exceptional member of the family of Fe-based superconductors. First, it is a stochiometric superconductor at ambient pressure with high critical temperature Tc ∼ 35 K. Second, this superconducting phase can be found in close proximity to a so-called hedgehog vortex magnetic order (SVC), which does preserve tetragonal symmetry. This is in contrast to the ubiquitous stripe-type magnetic order (SSDW) in the Fe-based superconductors that is accompanied by a vestigial nematic phase. Thus, CaKFe4As4 is an important testbed to investigate the interplay of superconductivity with different magnetic orders and nematicity. Here, we will discuss the impact of anisotropic strains, which couple directly to the nematic order parameter, on superconductivity. To this end, we present measurements of Tc as well as results of DFT calculations of the stability of SVC vs. SSDW order under large strains. Our results support the notion that nematic fluctuations contribute to superconducting pairing in this high-Tc superconductor.Funded through the SFB/TRR288 (Elasto-Q-mat).

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