Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe

T. Kuwayama, K. Matsuura, J. Gouchi, Y. Yamakawa, Y. Mizukami, S. Kasahara, Y. Matsuda, T. Shibauchi, H. Kontani, Y. Uwatoko, N. Fujiwara

Research output: Contribution to journalArticlepeer-review

Abstract

FeSe is a unique high-Tc iron-based superconductor in which nematicity, superconductivity, and magnetism are entangled with each other in the P-T phase diagram. We performed 77Se-nuclear magnetic resonance measurements under pressures of up to 3.9 GPa on 12% S-substituted FeSe, in which the complex overlap between the nematicity and magnetism are resolved. A pressure-induced Lifshitz transition was observed at 1.0 GPa as an anomaly of the density of states and as double superconducting (SC) domes accompanied by different types of antiferromagnetic (AF) fluctuations. The low-Tc SC dome below 1 GPa is accompanied by strong AF fluctuations, whereas the high-Tc SC dome develops above 1 GPa, where AF fluctuations are fairly weak. These results suggest the importance of the dxy orbital and its intra-orbital coupling for the high-Tc superconductivity.

Original languageEnglish
Article number17265
JournalScientific reports
Volume11
Issue number1
DOIs
Publication statusPublished - Dec 2021

ASJC Scopus subject areas

  • General

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