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journal article·2018-10-01Open access

Magnetic fluctuations under pressure on S-doped FeSe studied via 77Se NMR

Takanori Kuwayama, Kohei Matsuura, Yuta Mizukami, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi, Yoshiya Uwatoko, Naoki Fujiwara

AIP Advances· Volume 8· Issue 10
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Source abstract

Abstract

FeSe1-xSx has attracted much attention among iron-based superconductors because the pure sample undergoes nematic and superconducting (SC) phase transitions without magnetism. A pressure-induced antiferromagnetic (AFM) phase emerges upon applying pressure. In the pressure (P)-temperature (T) phase diagram for the 12%-S doped sample, the AFM phase is separated from the nematic phase at around 3.0 GPa, and SC transition temperature (Tc) takes a maximum (∼30 K). We measured T1 of 77Se for the 12%-S doped FeSe at 3.0 GPa. We found from 1/T1T that low-energy AFM fluctuations are not so much enhanced under pressure compared with those at ambient pressure. The result suggests changes of topology and nesting of Fermi surfaces during pressurizing process.
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Research context

OpenAlex topics: Iron-based superconductors research · Physics of Superconductivity and Magnetism · Rare-earth and actinide compounds

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Human & Environmental Studies, Kyoto University 1 , Yoshida-Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan

Graduate School of Frontier Sciences, University of Tokyo 2 , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Division of Physics and Astronomy, Graduate School of Science, Kyoto University 3 , Kitasirakawa, Sakyo, Kyoto 606-8502, Japan

Institute for Solid State Physics, University of Tokyo 4 , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

Funding

Mitsubishi Foundation · Japan Society for the Promotion of Science

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