High-temperature superconductivity (Tc onset at 34 K) in the high-pressure orthorhombic phase of FeSe

G. Garbarino; A. Sow; P. Lejay; A. Sulpice; P. Toulemonde; M. Mezouar; M. Núñez-Regueiro

doi:10.1209/0295-5075/86/27001

High-temperature superconductivity (T_c onset at 34 K) in the high-pressure orthorhombic phase of FeSe

G. Garbarino¹, A. Sow², P. Lejay², A. Sulpice², P. Toulemonde², M. Mezouar¹ and M. Núñez-Regueiro²

Published 21 April 2009 • Europhysics Letters Association
Europhysics Letters, Volume 86, Number 2 Citation G. Garbarino et al 2009 EPL 86 27001 DOI 10.1209/0295-5075/86/27001

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¹ 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

Dates

Received 17 March 2009
Accepted 31 March 2009
Published 21 April 2009

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Abstract

We have studied the structural and superconducting properties of β–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 T_c reaching 34 K at 22 GPa.

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