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Pressure-induced successive magnetic and structural phase transitions in Fe 1.087 Te

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  • Jens-Erik Jørgensen
  • Thomas Hansen

Abstract

The crystal and magnetic structures of Fe 1.087 Te have been studied by neutron powder diffraction in the temperature range from 5 to 170 K at pressures in the range from ≈0.8 to ≈7 GPa. The p, T-phase diagram contains three phases with monoclinic, orthorhombic and tetragonal symmetry. The monoclinic and orthorhombic phases are both antiferromagnetically ordered and stable at temperatures below ≈69 K while the non-magnetic tetragonal phase is stable above this temperature. The monoclinic phase is stable for p ≲ 1.2 GPa while the orthorhombic phase is stable for 1.2 ≲ p ≲ 1.7 GPa and the tetragonal phase becomes stable at higher pressures at the lowest measured temperatures. The magnetic ordering is antiferromagnetic bicollinear and commensurate in the monoclinic phase but incommensurate and pressure dependent in the orthorhombic phase. The pressure-induced collapse of magnetic order at ≈1.7 GPa is accompanied by abrupt changes in volume and compressibility, suggestive of a spin state change of the Fe 2+ ions in the FeTe layers. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Suggested Citation

  • Jens-Erik Jørgensen & Thomas Hansen, 2015. "Pressure-induced successive magnetic and structural phase transitions in Fe 1.087 Te," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 88(5), pages 1-8, May.
    • Handle: RePEc:spr:eurphb:v:88:y:2015:i:5:p:1-8:10.1140/epjb/e2015-50713-6
    DOI: 10.1140/epjb/e2015-50713-6
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    Solid State and Materials;

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