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Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
Sun, J.P.
2826
Matsuura, K.
2827
Ye, G.Z.
2828
Mizukami, Y.
2829
Shimozawa, M.
2830
Matsubayashi, K.
2831
Yamashita, M.
2832
Watashige, T.
2833
Kasahara, S.
2834
Matsuda, Y.
2835
Yan, J.-Q.
2836
Sales, B.C.
2837
Uwatoko, Y.
2838
Cheng, J.-G.
2839
Shibauchi, T.
2840
Condensed matter
Physical sciences
Materials science
The coexistence and competition between superconductivity and electronic orders, such as spin or charge density waves, have been a central issue in high transition-temperature (Tc) superconductors. Unlike other iron-based superconductors, FeSe exhibits nematic ordering without magnetism whose relationship with its superconductivity remains unclear. Moreover, a pressure-induced fourfold increase of Tc has been reported, which poses a profound mystery. Here we report high-pressure magnetotransport measurements in FeSe up to ~15 GPa, which uncover the dome shape of magnetic phase superseding the nematic order. Above ~6 GPa the sudden enhancement of superconductivity (Tc≤38.3 K) accompanies a suppression of magnetic order, demonstrating their competing nature with very similar energy scales. Above the magnetic dome, we find anomalous transport properties suggesting a possible pseudogap formation, whereas linear-in-temperature resistivity is observed in the normal states of the high-Tc phase above 6 GPa. The obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-Tc cuprates.
UTokyo Research掲載「鉄系超伝導物質の転移温度が圧力下で4倍以上に上昇する謎を解明」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/mysterious-increased-transition-temperature-of-iron-selenide-superconductor-under-high-pressure.html
UTokyo Research "Mysterious increased transition temperature of iron selenide superconductor under high pressure" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/mysterious-increased-transition-temperature-of-iron-selenide-superconductor-under-high-pressure.html
journal article
Nature Publishing Group
2016-07-19
application/pdf
Nature communications
7
12146
AA12645905
2041-1723
https://repository.dl.itc.u-tokyo.ac.jp/record/743/files/ncomms12146.pdf
eng
info:doi/10.1038/ncomms12146
http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/mysterious-increased-transition-temperature-of-iron-selenide-superconductor-under-high-pressure.html
http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/mysterious-increased-transition-temperature-of-iron-selenide-superconductor-under-high-pressure.html
https://dx.doi.org/10.1038/ncomms12146
© The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/