%0 Journal Article %1 PhysRevB.109.L020504 %A Molatta, S. %A Kotte, T. %A Opherden, D. %A Koutroulakis, G. %A Schlueter, J. A. %A Zwicknagl, G. %A Brown, S. E. %A Wosnitza, J. %A Kühne, H. %D 2024 %I American Physical Society %J Phys. Rev. B %K a %N 2 %P L020504 %R 10.1103/PhysRevB.109.L020504 %T Order-parameter evolution in the Fulde-Ferrell-Larkin-Ovchinnikov phase %U https://link.aps.org/doi/10.1103/PhysRevB.109.L020504 %V 109 %X We report on the temperature dependence of the spatially modulated spin-polarization amplitude $\ensuremath\DeltaK_spin$, which is a hallmark of the superconducting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. For that, we use $^13C$ nuclear magnetic resonance (NMR) spectroscopy performed on the organic conductor $\beta^''\ensuremath-(ET)_2SF_5CH_2CF_2SO_3$. From a comparison of our experimental results to a comprehensive modeling of the $^13C$ NMR spectra, we determine the evolution of $\ensuremath\DeltaK_spin$ 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 $\beta^''\ensuremath-(ET)_2SF_5CH_2CF_2SO_3$.

@article{PhysRevB.109.L020504, abstract = {We report on the temperature dependence of the spatially modulated spin-polarization amplitude $\mathrm{\ensuremath{\Delta}}{K}_{\text{spin}}$, which is a hallmark of the superconducting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. For that, we use $^{13}\mathrm{C}$ nuclear magnetic resonance (NMR) spectroscopy performed on the organic conductor ${\ensuremath{\beta}}^{\ensuremath{'}\ensuremath{'}}\text{\ensuremath{-}}{(\mathrm{ET})}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$. From a comparison of our experimental results to a comprehensive modeling of the $^{13}\mathrm{C}$ NMR spectra, we determine the evolution of $\mathrm{\ensuremath{\Delta}}{K}_{\text{spin}}$ 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 ${\ensuremath{\beta}}^{\ensuremath{'}\ensuremath{'}}\text{\ensuremath{-}}{(\mathrm{ET})}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$.}, added-at = {2024-01-31T10:19:16.000+0100}, author = {Molatta, S. and Kotte, T. and Opherden, D. and Koutroulakis, G. and Schlueter, J. A. and Zwicknagl, G. and Brown, S. E. and Wosnitza, J. and Kühne, H.}, biburl = {https://www.bibsonomy.org/bibtex/2174a93d88a5e78e5762ad9314d52b5ac/ctqmat}, day = 22, description = {Phys. Rev. B 109, L020504 (2024) - Order-parameter evolution in the Fulde-Ferrell-Larkin-Ovchinnikov phase}, doi = {10.1103/PhysRevB.109.L020504}, interhash = {af3e18a6db5d0d7f36e2a20f8e12c256}, intrahash = {174a93d88a5e78e5762ad9314d52b5ac}, journal = {Phys. Rev. B}, keywords = {a}, month = {01}, number = 2, numpages = {5}, pages = {L020504}, publisher = {American Physical Society}, timestamp = {2024-01-31T10:19:16.000+0100}, title = {Order-parameter evolution in the Fulde-Ferrell-Larkin-Ovchinnikov phase}, url = {https://link.aps.org/doi/10.1103/PhysRevB.109.L020504}, volume = 109, year = 2024 }