TY - JOUR
T1 - High-pressure phase diagrams of FeSe1−xTex
T2 - correlation between suppressed nematicity and enhanced superconductivity
AU - Mukasa, K.
AU - Matsuura, K.
AU - Qiu, M.
AU - Saito, M.
AU - Sugimura, Y.
AU - Ishida, K.
AU - Otani, M.
AU - Onishi, Y.
AU - Mizukami, Y.
AU - Hashimoto, K.
AU - Gouchi, J.
AU - Kumai, R.
AU - Uwatoko, Y.
AU - Shibauchi, T.
N1 - Funding Information:
The authors would like to thank H. Ikeda for helpful discussion and S. Nagasaki for technical assistance of high-pressure experiments. This work was partially carried out by the joint research in the Institute for Solid State Physics, University of Tokyo. The synchrotron X-ray study was performed with the approval of the Photon Factory Program Advisory Committee (No. 2017S2-001). This work was supported by Grants-in-Aid for Scientific Research (KAKENHI Grant Nos JP18K13492, JP18H05227, JP19H00649, JP18H01853, JP18KK0375, JP18J11320, JP19K22123, JP19H00648, JP20H02600, and JP20K21139), Grant-in-Aid for Scientific Research on Innovative Areas “Quantum Liquid Crystals” (KAKENHI Grant No. JP19H05824) from Japan Society for the Promotion of Science, and CREST (No. JPMJCR19T5) from Japan Science and Technology.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The interplay among magnetism, electronic nematicity, and superconductivity is the key issue in strongly correlated materials including iron-based, cuprate, and heavy-fermion superconductors. Magnetic fluctuations have been widely discussed as a pairing mechanism of unconventional superconductivity, but recent theory predicts that quantum fluctuations of nematic order may also promote high-temperature superconductivity. This has been studied in FeSe1−xSx superconductors exhibiting nonmagnetic nematic and pressure-induced antiferromagnetic orders, but its abrupt suppression of superconductivity at the nematic end point leaves the nematic-fluctuation driven superconductivity unconfirmed. Here we report on systematic studies of high-pressure phase diagrams up to 8 GPa in high-quality single crystals of FeSe1−xTex. When Te composition x(Te) becomes larger than 0.1, the high-pressure magnetic order disappears, whereas the pressure-induced superconducting dome near the nematic end point is continuously found up to x(Te) ≈ 0.5. In contrast to FeSe1−xSx, enhanced superconductivity in FeSe1−xTex does not correlate with magnetism but with the suppression of nematicity, highlighting the paramount role of nonmagnetic nematic fluctuations for high-temperature superconductivity in this system.
AB - The interplay among magnetism, electronic nematicity, and superconductivity is the key issue in strongly correlated materials including iron-based, cuprate, and heavy-fermion superconductors. Magnetic fluctuations have been widely discussed as a pairing mechanism of unconventional superconductivity, but recent theory predicts that quantum fluctuations of nematic order may also promote high-temperature superconductivity. This has been studied in FeSe1−xSx superconductors exhibiting nonmagnetic nematic and pressure-induced antiferromagnetic orders, but its abrupt suppression of superconductivity at the nematic end point leaves the nematic-fluctuation driven superconductivity unconfirmed. Here we report on systematic studies of high-pressure phase diagrams up to 8 GPa in high-quality single crystals of FeSe1−xTex. When Te composition x(Te) becomes larger than 0.1, the high-pressure magnetic order disappears, whereas the pressure-induced superconducting dome near the nematic end point is continuously found up to x(Te) ≈ 0.5. In contrast to FeSe1−xSx, enhanced superconductivity in FeSe1−xTex does not correlate with magnetism but with the suppression of nematicity, highlighting the paramount role of nonmagnetic nematic fluctuations for high-temperature superconductivity in this system.
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U2 - 10.1038/s41467-020-20621-2
DO - 10.1038/s41467-020-20621-2
M3 - Article
C2 - 33452257
AN - SCOPUS:85099433349
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 381
ER -