SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 57: Poster: Superconductivity I
TT 57.19: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2
Order-parameter evolution in the FFLO phase — •H. Kühne1, S. Molatta1, T. Kotte1, D. Opherden1, G. Koutroulakis2, J.A. Schlueter3,4, G. Zwicknagl5, S.E. Brown6, and J. Wosnitza1,7 — 1Hochfeld-Magnetlabor Dresden, HZDR — 2UC Santa Barbara, USA — 3ANL, Argonne, USA — 4NSF, Alexandria, USA — 5IMP, TU Braunschweig — 6UC Los Angeles, USA — 7IFMP, TU Dresden
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state represents a general concept of pairing in multi-component Fermi liquids with strong population imbalance. In the superconducting FFLO state, the spin polarization varies as the modulus of the spatially modulated superconducting gap amplitude, and, thus, its modulation amplitude represents the order parameter. Indeed, NMR experiments of the organic superconductors β′ ′-(ET)2SF5CH2CF2SO3 and κ-(ET)2Cu(NCS)2 showed the emergence of inhomogeneous line broadening, stemming from the spatially modulated spin polarization. We report on our studies of the temperature-dependent order parameter of the superconducting FFLO state. For that, we utilize 13C NMR spectroscopy of β′ ′-(ET)2SF5CH2CF2SO3. From a comparison of the NMR spectra to a comprehensive modeling, we determine the evolution of the local spin-polarization modulation amplitude upon condensation of the FFLO state. Further, the modeling allows to quantify the decrease of the average spin polarization, stemming from the spin-singlet coupling of the superconducting electron pairs.