Abstract

KUWAYAMA, T. et al. Pressure-induced Lifshitz transition in FeSe0.88S0.12 probed via 77Se-NMR. Pap. Phys. [online]. 2019, vol.11, n.1, pp.1-5. ISSN 1852-4249.  http://dx.doi.org/10.4279/PIP.110003.

Recently, FeSe1-xSx systems have received much attention because of the unique pressure-temperature phase diagram. We performed 77Se-NMR measurements on a single crystal of FeSe0.88S0.12 to investigate its microscopic properties. The shift of 77Se spectra exhibits anomalous enhancement at 1.0 GPa, suggesting a topological change in the Fermi surfaces, the socalled Lifshitz transition, occurs at 1.0 GPa. The magnetic fluctuation simultaneously changes its properties, which implies a change in the dominant nesting vector.

Keywords : NMR, Superconductor, Strongly correlated electron system, Iron superconductor.

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