Pressure-Induced Effects on the Structure of the FeSe Superconductor

Jasmine N. Millican; Daniel Phelan; Evan L. Thomas; Juscelino B. Leao; Elisabeth Carpenter

doi:10.1016/j.ssc.2009.02.011

Pressure-Induced Effects on the Structure of the FeSe Superconductor

Superconductivity 2009-04-02 v3

Authors: Jasmine N. Millican , Daniel Phelan , Evan L. Thomas , Juscelino B. Leao , Elisabeth Carpenter

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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.

Keywords

FeSe superconductor pressure-induced structural change neutron powder diffraction bulk modulus anisotropic compressibility bond angles

Cite

@article{arxiv.0902.0971,
  title  = {Pressure-Induced Effects on the Structure of the FeSe Superconductor},
  author = {Jasmine N. Millican and Daniel Phelan and Evan L. Thomas and Juscelino B. Leao and Elisabeth Carpenter},
  journal= {arXiv preprint arXiv:0902.0971},
  year   = {2009}
}

Pressure-Induced Effects on the Structure of the FeSe Superconductor

Abstract

Keywords

Cite

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