Superconductivity of highly spin-polarized electrons in FeSe probed by $^{\mathbf{77}}$Se NMR. Molatta, S, Opherden, D, Wosnitza, J, Opherden, L, Zhang, Z T, Wolf, T, Löhneysen, H v, Sarkar, R, Biswas, P K, Grafe, H., & Kühne, H Phys. Rev. B, 104(1):014504, American Physical Society, 07, 2021. ![Superconductivity of highly spin-polarized electrons in FeSe probed by $^{\mathbf{77}}$Se NMR [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex A number of recent experiments indicate that the iron-chalcogenide FeSe provides the long-sought possibility to study bulk superconductivity in the cross-over regime between the weakly coupled Bardeen-Cooper-Schrieffer (BCS) pairing and the strongly coupled Bose-Einstein condensation (BEC). We report on 77Se nuclear magnetic resonance experiments of FeSe, focused on the superconducting phase for strong magnetic fields applied along the c axis, where a distinct state with large spin polarization was reported. We determine this high-field state as bulk superconducting with high spatial homogeneity of the low-energy spin fluctuations. Further, we find that the static spin susceptibility becomes unusually small at temperatures approaching the superconducting state, despite the presence of pronounced spin fluctuations. Taken together, our results clearly indicate that FeSe indeed features an unusual field-induced superconducting state of a highly spin-polarized Fermi liquid in the BCS-BEC crossover regime.
@article{PhysRevB.104.014504,
abstract = {A number of recent experiments indicate that the iron-chalcogenide FeSe provides the long-sought possibility to study bulk superconductivity in the cross-over regime between the weakly coupled Bardeen-Cooper-Schrieffer (BCS) pairing and the strongly coupled Bose-Einstein condensation (BEC). We report on 77Se nuclear magnetic resonance experiments of FeSe, focused on the superconducting phase for strong magnetic fields applied along the c axis, where a distinct state with large spin polarization was reported. We determine this high-field state as bulk superconducting with high spatial homogeneity of the low-energy spin fluctuations. Further, we find that the static spin susceptibility becomes unusually small at temperatures approaching the superconducting state, despite the presence of pronounced spin fluctuations. Taken together, our results clearly indicate that FeSe indeed features an unusual field-induced superconducting state of a highly spin-polarized Fermi liquid in the BCS-BEC crossover regime.},
added-at = {2021-10-14T17:48:42.000+0200},
author = {Molatta, S and Opherden, D and Wosnitza, J and Opherden, L and Zhang, Z T and Wolf, T and Löhneysen, H v and Sarkar, R and Biswas, P K and Grafe, H-J and Kühne, H},
biburl = {https://www.bibsonomy.org/bibtex/269ea75feb99215eaa3ce405db89a1e45/ctqmat},
day = 12,
description = {Superconductivity of highly spin-polarized electrons in FeSe probed by 77Se NMR},
doi = {10.1103/PhysRevB.104.014504},
interhash = {72f49e616a3cf9de452566cc9568b3c0},
intrahash = {69ea75feb99215eaa3ce405db89a1e45},
journal = {Phys. Rev. B},
keywords = {a},
month = {07},
number = 1,
numpages = {6},
pages = 014504,
privnote = {arxiv,https://arxiv.org/abs/2010.10128},
publisher = {American Physical Society},
timestamp = {2023-10-19T09:57:18.000+0200},
title = {Superconductivity of highly spin-polarized electrons in FeSe probed by $^{\mathbf{77}}$Se NMR},
url = {https://journals.aps.org/prb/pdf/10.1103/PhysRevB.104.014504},
volume = 104,
year = 2021
}
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We determine this high-field state as bulk superconducting with high spatial homogeneity of the low-energy spin fluctuations. Further, we find that the static spin susceptibility becomes unusually small at temperatures approaching the superconducting state, despite the presence of pronounced spin fluctuations. 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