Pressure-induced Lifshitz transition in FeSe$_{0.88}$S$_{0.12}$ probed via $^{77}$Se-NMR

T. Kuwayama; K. Matsuura; Y. Mizukami; S. Kasahara; Y. Matsuda; T. Shibauchi; Y. Uwatoko; N. Fujiwara

doi:10.4279/pip.110003

Authors

T. Kuwayama Graduate School of Human and Environmental Studies, Kyoto University
K. Matsuura Graduate School of Frontier Sciences, University of Tokyo, 277-8581 Kashiwa, Japan.
Y. Mizukami Graduate School of Frontier Sciences, University of Tokyo, 277-8581 Kashiwa, Japan.
S. Kasahara Division of Physics and Astronomy, Graduate School of Science, Kyoto 606-8502 Kyoto, Japan.
Y. Matsuda Division of Physics and Astronomy, Graduate School of Science, Kyoto 606-8502 Kyoto, Japan.
T. Shibauchi Graduate School of Frontier Sciences, University of Tokyo, 277-8581 Kashiwa, Japan.
Y. Uwatoko Institute for Solid State Physics, University of Tokyo, 277-8581 Kashiwa, Japan.
N. Fujiwara Graduate School of Human and Environmental Studies, Kyoto University, 606-8501 Kyoto, Japan.

DOI:

https://doi.org/10.4279/pip.110003

Keywords:

NMR, Superconductor, Strongly correlated electron system, Iron superconductor

Abstract

Recently, FeSe$_{1-x}$S$_x$ systems have received much attention because of the unique pressure-temperature phase diagram. We performed $^{77}$Se-NMR measurements on a single crystal of FeSe$_{0.88}$S$_{0.12}$ to investigate its microscopic properties. The shift of $^{77}$Se spectra exhibits anomalous enhancement at $1.0~\mathrm{GPa}$, suggesting a topological change in the Fermi surfaces, so-called Lifshitz transition, occurs at $1.0~\mathrm{GPa}$. The magnetic fluctuation simultaneously changes its properties, which implies a change in the dominant nesting vector.

Edited by: A. Goñi, A. Cantarero, J. S. Reparaz