Pressure-Induced Effects on the Structure of the FeSe Superconductor

Abstract

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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Cited by in corpus (10)

• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• The Structural Phase Transition in FeSe (Fe1+dSe)
• High temperature superconducting FeSe films on SrTiO3 substrates
• High temperature superconductivity (Tc onset at 34K) in the high pressure orthorhombic phase of FeSe
• Suppression of superconductivity in FeSe films under tensile strain
• Superconducting properties of sulfur-doped iron selenide
• Metal - Insulator transition in Fe1.01-xCuxSe
• Successive phase transitions under high pressure in FeTe0.92
• Resistivity and magnetoresistance of FeSe single crystals under Helium-gas pressure
• Acoustic characteristics of FeSe single crystals Acoustic characteristics of FeSe single crystals