51 research outputs found
High pressure transport studies of the LiFeAs analogues CuFeTe2 and Fe2As
We have synthesized two iron-pnictide/chalcogenide materials, CuFeTe2 and
Fe2As, which share crystallographic features with known iron-based
superconductors, and carried out high-pressure electrical resistivity
measurements on these materials to pressures in excess of 30 GPa. Both
compounds crystallize in the Cu2Sb-type crystal structure that is
characteristic of LiFeAs (with CuFeTe2 exhibiting a disordered variant). At
ambient pressure, CuFeTe2 is a semiconductor and has been suggested to exhibit
a spin-density-wave transition, while Fe2As is a metallic antiferromagnet. The
electrical resistivity of CuFeTe2, measured at 4 K, decreases by almost two
orders of magnitude between ambient pressure and 2.4 GPa. At 34 GPa, the
electrical resistivity decreases upon cooling the sample below 150 K,
suggesting the proximity of the compound to a metal-insulator transition.
Neither CuFeTe2 nor Fe2As superconduct above 1.1 K throughout the measured
pressure range.Comment: 6 pages, 7 figure
The change in the width of the forbidden band during polymorphic transformations in AIIBIVC 2 V compounds
Photosensitive structures based on ZnP2 single crystals of monoclinic and tetragonal modifications: Fabrication and properties
Photosensitivity of the structures based on quinary solid solutions of the isoelectronic series of germanium
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