Effect of pressure on the magnetostructural transition in SrFe2As2

Abstract

We present a systematic pressure study of poly- and single crystalline SrFe2As2 by electrical resistivity and X-ray diffraction measurements. SrFe2As2 exhibits a structural phase transition from a tetragonal to an orthorhombic phase at T0=205 K. The structural phase transition is intimately linked to a spin-density-wave transition taking place at the same temperature. Our pressure experiments show that T0 shifts to lower temperatures with increasing pressure. We can estimate a critical pressure of 4 to 5 GPa for the suppression of T0 to zero temperature. At pressures above 2.5 GPa the resistivity decreases significantly below Tx=40 K hinting at the emergence of superconductivity but no zero-resistance state is observed up to 3 GPa.

5 pages, 4 figures, accepted for publication in Phys. Rev. B

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• Evolution of bulk superconductivity in SrFe2As2 with Ni substitution
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
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• Interplay between superconductivity and magnetism in K-doped EuFe2As2
• Magnetic and lattice coupling in single-crystal SrFe${}_2$As${}_2$: A neutron scattering study