Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe

J. P. Sun, K. Matsuura, G. Z. Ye, Y. Mizukami, M. Shimozawa, K. Matsubayashi, M. Yamashita, T. Watashige, S. Kasahara, Y. Matsuda, J. -Q. Yan (), B. C. Sales, Y. Uwatoko, J. -G. Cheng () and T. Shibauchi ()
Additional contact information
J. P. Sun: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
K. Matsuura: University of Tokyo
G. Z. Ye: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
Y. Mizukami: University of Tokyo
M. Shimozawa: The Institute for Solid State Physics, The University of Tokyo
K. Matsubayashi: The University of Electro-Communications
M. Yamashita: The Institute for Solid State Physics, The University of Tokyo
T. Watashige: Kyoto University
S. Kasahara: Kyoto University
Y. Matsuda: Kyoto University
J. -Q. Yan: Oak Ridge National Laboratory
B. C. Sales: Oak Ridge National Laboratory
Y. Uwatoko: The Institute for Solid State Physics, The University of Tokyo
J. -G. Cheng: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
T. Shibauchi: University of Tokyo

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms12146

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