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DOE OSTI · 2571439

Order-parameter evolution in the Fulde-Ferrell-Larkin-Ovchinnikov phase

Molatta, S.·Kotte, T.·Opherden, D.·Koutroulakis, G.·Schlueter, J. A.·Zwicknagl, G.·Brown, S. E.·Wosnitza, J.·Kühne, H.
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Abstract

Here, we report on the temperature dependence of the spatially modulated spin-polarization amplitude ΔK spin , which is a hallmark of the superconducting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. For that, we use 13 C nuclear magnetic resonance (NMR) spectroscopy performed on the organic conductor β" -(ET) 2 SF 5 CH 2 CF 2 SO 3 . From a comparison of our experimental results to a comprehensive modeling of the 13 C NMR spectra, we determine the evolution of ΔK spin upon condensation of the FFLO state. Further, the modeling of the spectra in the superconducting phase allows to quantify the decrease of the average spin susceptibility, stemming from the spin-singlet coupling of the superconducting electron pairs in the FFLO state of β" -(ET) 2 SF 5 CH 2 CF 2 SO 3 .

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Molatta, S., Kotte, T., Opherden, D., Koutroulakis, G., Schlueter, J. A., Zwicknagl, G., Brown, S. E., Wosnitza, J., Kühne, H.. 2024-01-22. Order-parameter evolution in the Fulde-Ferrell-Larkin-Ovchinnikov phase. https://doi.org/10.1103/physrevb.109.l020504

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