FeTe is a iron based vdW layered superconductor. Iron Telluride (FeTe) is a member of layered materials. FeTe is considered as the parent material of the simplest family of iron-based superconductors. The crystal structure of iron telluride consists of a continuous stacking of FeTe layers, where a square-lattice layer of iron atoms is sandwiched between two twice-sparser layers of bonding chalcogen atoms. Crystals are grown using flux zone method which is known to produce well crystallized and defect free vdW superconductors.
Growth method matters> Flux zone or CVT growth method? Contamination of halides and point defects in layered crystals are well known cause for absence of superconductivity, less prominent Tc (critical temperature), and high sheet resistance. Flux zone technique is a halide free technique used for synthesizing truly semiconductor grade vdW crystals. This method distinguishes itself from chemical vapor transport (CVT) technique in the following regard: CVT is a quick (~2 weeks) growth method but exhibits poor crystalline quality and the defect concentration reaches to 1E11 to 1E12 cm-2 range. In contrast, flux method takes long (~3 months) growth time, but ensures slow crystallization for perfect atomic structuring, and impurity free crystal growth with defect concentration as low as 1E9 - 1E10 cm-2. During check out just state which type of growth process is preferred. Unless otherwise stated, 2Dsemiconductors ships Flux zone crystals as a default choice.
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