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TT: Fachverband Tiefe Temperaturen

TT 9: Focus Session: Anomalous Quantum Oscillations

TT 9.5: Invited Talk

Monday, March 18, 2024, 17:15–17:45, H 0104

Quantum oscillations of superconducting iron-chalcogenides FeSe_1−xS_x — •Amalia Coldea — Clarendon Laboratory, University of Oxford, Oxford, UK

Iron-chalcogenides superconductors display intertwined electronic nematic and spin-density wave phases and their role in superconducting pairing is difficult to assess. However, versatile tuning parameters, like applied pressure and chemical pressure [1,2], can be used to separate and explore their relative importance. I will present quantum oscillations studies in FeSe_1−xS_x using magnetotransport and tunnel diode oscillator experiments tuned both by chemical and applied pressures [3,4,5,6]. I will discuss the evolution of the Fermi surface and the quasiparticle effective masses in the high-pressure phase of the tetragonal FeSe_1−xS_x where superconductivity is enhanced. These findings will be compared with magnetotransport studies to understand the signatures of different competing phases with superconductivity [7].

[1] A. I. Coldea, Frontiers in Phys. 8, 594500 (2021)

[2] A. I. Coldea et al., npj Quantum Materials, 4, 2 (2019)

[3] P. Reiss et al, Nat. Phys. 16, 89 (2020)

[4] P. Reiss et al, Phys. Rev. Lett. 127, 246402 (2021)

[5] Z. Zajicek et al., A. I. Coldea, Phys. Rev. Res. 4, 043123 (2022)

[6] Z. Zajicek et al., A. I. Coldea, submitted (2023)

[7] P. Reiss et al., arXiv.2212.06824 (2022)

Keywords: Quantum oscillations; Superconductivity; High pressure studies