Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Unconventional Superconductors

TT 41.14: Vortrag

Mittwoch, 18. März 2020, 18:45–19:00, HSZ 201

Local spin susceptibility in the FFLO state of an all-organic conductor — •S. Molatta^1,2, H.H. Wang³, G. Koutroulakis³, J.A. Schlueter⁴, S.E. Brown³, J. Wosnitza^1,2, and H. Kühne¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — ²Institut für Festkörper- und Materialphysik, TU Dresden, Germany — ³Department of Physics and Astronomy, UCLA, Los Angeles, USA — ⁴Materials Science Division, Argonne National Laboratory, Argonne, USA

The phenomenology of the superconducting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, initially proposed in 1964, was experimentally confirmed in several organic conductors during the last years. A spatial modulation of the superconducting order parameter and spin susceptibility, caused by a strong population imbalance of a multi-component Fermi liquid, is a hallmark of the FFLO state. We report on recent results of ¹³C nuclear magnetic resonance (NMR) measurements of the material β^{′ ′}-(ET)₂SF₅CH₂CF₂SO₃, which probe the inhomogeneous spatial distribution of the static and dynamic spin susceptibility across the transition from normal into the FFLO state. The NMR results reveal a low-temperature onset and increase of the inhomogeneous spectral line broadening and related superconducting gap amplitude. Further, increased spin fluctuations in the regime of the thermodynamic phase boundary indicate a complex interplay of FFLO superconductivity, reduced dimensionality, and inter-plane coherence.