Electronic and magnetic phase diagram of Β-Fe1.01 Se with superconductivity at 36.7 K underpressure

S. Medvedev, T. M. McQueen, I. A. Troyan, T. Palasyuk, M. I. Eremets, R. J. Cava, S. Naghavi, F. Casper, V. Ksenofontov, G. Wortmann, C. Felser

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The discovery of new high-temperature superconductors1 based on FeAs has led to a new gold rush in high-TC superconductivity. All of the new superconductors share the same common structural motif of FeAs layers and reach TC values up to 55 K (ref.2). Recently, superconductivity has been reported in FeSe (ref.3), which has the same iron pnictide layer structure, but without separating layers. Here, we report the magnetic and electronic phase diagram of Β-Fe1.01 Se as a function of temperature and pressure. The superconducting transition temperature increases from 8.5 to 36.7 K under an applied pressure of 8.9 GPa. It then decreases at higher pressures. A marked change in volume is observed at the same time as TC rises, owing to a collapse of the separation between the Fe 2 Se2 layers. No static magnetic ordering is observed for the whole p-T phase diagram. We also report that at higher pressures (starting around 7 GPa and completed at 38 GPa), Fe1.01 Se transforms to a hexagonal NiAs-type structure and exhibits non-magnetic behaviour.

Original languageEnglish (US)
Pages (from-to)630-633
Number of pages4
JournalNature Materials
Issue number8
StatePublished - Aug 2009

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science


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