Volume 86, Number 2, April 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 April 2009|
High-temperature superconductivity ( onset at 34 K) in the high-pressure orthorhombic phase of FeSe
European Synchrotron Radiation Facility (ESRF) - 6 Rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France, EU
2 Institut NEEL, CNRS & Université Joseph Fourier - 25 Avenue des Martyrs, BP 166, F-38042 Grenoble Cedex 9, France, EU
Corresponding author: email@example.com
Accepted: 31 March 2009
We have studied the structural and superconducting properties of –FeSe under pressures up to 26 GPa using synchrotron radiation and diamond anvil cells. The bulk modulus of the tetragonal phase is 28.5(3) GPa, much smaller than the rest of Fe based superconductors. At 12 GPa we observe a phase transition from the tetragonal to an orthorhombic symmetry. The high-pressure orthorhombic phase has a higher Tc reaching 34 K at 22 GPa.
PACS: 74.70.-b – Superconducting materials / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects
© EPLA, 2009
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