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

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 (T c) 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 T c 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 (T c ≤ 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-T c phase above 6 GPa. In conclusion, the obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-T c cuprates.

Authors:
 [1];  [2];  [3];  [2];  [2];  [4];  [2];  [5]; ORCiD logo [5];  [5];  [6];  [7];  [8];  [1]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of Tokyo, Chiba (Japan)
  3. Chinese Academy of Sciences (CAS), Beijing (China); Yunnan Univ., Kunming (China)
  4. The Univ. of Electro-Communications, Tokyo (Japan)
  5. Kyoto Univ., Kyoto (Japan)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. The Univ. of Tokyo, Chiba (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1329162
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal Issue: 12146; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetic properties and materials; superconducting properties and materials

Citation Formats

Sun, J. P., Matsuura, K., Ye, G. Z., Mizukami, Y., Shimozawa, M., Matsubayashi, K., Yamashita, M., Watashige, T., Kasahara, S., Matsuda, Y., Yan, J. -Q., Sales, B. C., Uwatoko, Y., Cheng, J. -G., and Shibauchi, T.. Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe. United States: N. p., 2016. Web. doi:10.1038/ncomms12146.
Sun, J. P., Matsuura, K., Ye, G. Z., Mizukami, Y., Shimozawa, M., Matsubayashi, K., Yamashita, M., Watashige, T., Kasahara, S., Matsuda, Y., Yan, J. -Q., Sales, B. C., Uwatoko, Y., Cheng, J. -G., & Shibauchi, T.. Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe. United States. doi:10.1038/ncomms12146.
Sun, J. P., Matsuura, K., Ye, G. Z., Mizukami, Y., Shimozawa, M., Matsubayashi, K., Yamashita, M., Watashige, T., Kasahara, S., Matsuda, Y., Yan, J. -Q., Sales, B. C., Uwatoko, Y., Cheng, J. -G., and Shibauchi, T.. 2016. "Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe". United States. doi:10.1038/ncomms12146. https://www.osti.gov/servlets/purl/1329162.
@article{osti_1329162,
title = {Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe},
author = {Sun, J. P. and Matsuura, K. and Ye, G. Z. and Mizukami, Y. and Shimozawa, M. and Matsubayashi, K. and Yamashita, M. and Watashige, T. and Kasahara, S. and Matsuda, Y. and Yan, J. -Q. and Sales, B. C. and Uwatoko, Y. and Cheng, J. -G. and Shibauchi, T.},
abstractNote = {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. In conclusion, the obtained phase diagram highlights unique features of FeSe among iron-based superconductors, but bears some resemblance to that of high-Tc cuprates.},
doi = {10.1038/ncomms12146},
journal = {Nature Communications},
number = 12146,
volume = 7,
place = {United States},
year = 2016,
month = 7
}

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Cited by: 16works
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  • In this study, we report low temperature x-ray diffraction studies combined with electrical resistance measurements on single crystals of iron-based layered superconductor FeSe to a temperature of 10 K and a pressure of 44 GPa. The low temperature high pressure x-ray diffraction studies were performed using a synchrotron source and superconductivity at high pressure was studied using designer diamond anvils. At ambient temperature, the FeSe sample shows a phase transformation from a PbO-type tetragonal phase to a NiAs-type hexagonal phase at 10 {+-} 2 GPa. On cooling, a structural distortion from a PbO-type tetragonal phase to an orthorhombic Cmma phasemore » is observed below 100 K. At a low temperature of 10 K, compression of the orthorhombic Cmma phase results in a gradual transformation to an amorphous phase above 15 GPa. The transformation to the amorphous phase is completed by 40 GPa at 10 K. A loss of superconductivity is observed in the amorphous phase and a dramatic change in the temperature behavior of electrical resistance indicates formation of a semiconducting state at high pressures and low temperatures. The formation of the amorphous phase is attributed to a kinetic hindrance to the growth of a hexagonal NiAs phase under high pressures and low temperatures.« less
  • The pressure dependence of the structural, magnetic, and superconducting transitions and of the superconducting upper critical field were studied in sulfur-substituted Fe ( Se 1 - x S x ) . We performed resistance measurements on single crystals with three substitution levels ( x = 0.043 , 0.096, 0.12) under hydrostatic pressures up to 1.8 GPa and in magnetic fields up to 9 T and were compared to data on pure FeSe. Our results illustrate the effects of chemical and physical pressure on Fe ( Se 1 - x S x ). Furthermore, on increasing sulfur content, magnetic order inmore » the low-pressure range is strongly suppressed to a small domelike region in the phase diagrams. But, T s is much less suppressed by sulfur substitution, and T c of Fe ( Se 1 - x S x ) exhibits similar nonmonotonic pressure dependence with a local maximum and a local minimum present in the low-pressure range for all x . The local maximum in T c coincides with the emergence of the magnetic order above T c . At this pressure the slope of the upper critical field decreases abruptly, which may indicate a Fermi-surface reconstruction. The minimum of T c correlates with a broad maximum of the upper critical field slope normalized by T c .« less
  • We report high temperature superconductivity in one unit-cell (1-UC) FeSe films grown on SrTiO{sub 3} (STO)(110) substrate by molecular beam epitaxy. By in-situ scanning tunneling microscopy measurement, we observe a superconducting gap as large as 17 meV on the 1-UC FeSe films. Transport measurements on 1-UC FeSe/STO(110) capped with FeTe layers reveal superconductivity with an onset transition temperature (T{sub C}) of 31.6 K and an upper critical magnetic field of 30.2 T. We also find that T{sub C} can be further increased by external electric field although the effect is weaker than that on STO(001) substrate.
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