Pressure-Induced Effects on the Structure of the FeSe Superconductor

Details Pressure-Induced Effects on the Structure of the FeSe Superconductor Pressure-Induced Effects on the Structure of the FeSe Superconductor

2009-02-05

arxiv.org/abs/0902.0971v3

Solid State Communications 149 (2009) 707-710.

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.ssc.2009.02.011

A polycrystalline sample of FeSe, which adopts the tetragonal PbO-type structure (P4/nmm) at room temperature, has been prepared using solid state reaction. We have investigated pressure-induced structural changes in tetragonal FeSe at varying hydrostatic pressures up to 0.6 GPa in the orthorhombic (T = 50 K) and tetragonal (T = 190 K) phases using high resolution neutron powder diffraction. We report that the structure is quite compressible with a Bulk modulus around 31 GPa to 33 GPa and that the pressure response is anisotropic with a larger compressibility along the c-axis. Key bond angles of the SeFe4 pyramids and FeSe4 tetrahedra are also determined as a function of pressure.

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