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

doi:10.1038/s41598-021-96277-9

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 Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

FeSe is a unique high-T_c 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-T_c SC dome below 1 GPa is accompanied by strong AF fluctuations, whereas the high-T_c SC dome develops above 1 GPa, where AF fluctuations are fairly weak. These results suggest the importance of the d_xy orbital and its intra-orbital coupling for the high-T_c superconductivity.

Original language	English
Article number	17265
Journal	Scientific reports
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41598-021-96277-9
Publication status	Published - Dec 2021

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title = "Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe",

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.",

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

note = "Funding Information: The present work was supported by Grants-in-Aid for Scientific Research (KAKENHI Grant No. JP18H01181) and a grant from the Mitsubishi Foundation. This work was partly supported by Grants-in-Aid for Scientific Research (KAKENHI Grant Nos. JP18H05227, JP19H00648, and JP18K13492) and by Innovative Areas ”Quantum Liquid Crystals” (No. JP19H05824) from the Japan Society for the Promotion of Science. Publisher Copyright: {\textcopyright} 2021, The Author(s).",

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doi = "10.1038/s41598-021-96277-9",

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AU - Kuwayama, T.

AU - Matsuura, K.

AU - Gouchi, J.

AU - Yamakawa, Y.

AU - Mizukami, Y.

AU - Kasahara, S.

AU - Matsuda, Y.

AU - Shibauchi, T.

AU - Kontani, H.

AU - Uwatoko, Y.

AU - Fujiwara, N.

N1 - Funding Information: The present work was supported by Grants-in-Aid for Scientific Research (KAKENHI Grant No. JP18H01181) and a grant from the Mitsubishi Foundation. This work was partly supported by Grants-in-Aid for Scientific Research (KAKENHI Grant Nos. JP18H05227, JP19H00648, and JP18K13492) and by Innovative Areas ”Quantum Liquid Crystals” (No. JP19H05824) from the Japan Society for the Promotion of Science. Publisher Copyright: © 2021, The Author(s).

PY - 2021/12

Y1 - 2021/12

N2 - 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.

AB - 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.

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

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