Thursday, February 8, 2018

Solid state single crystal growth of three-dimensional faceted LaFeAsO crystals


Crystal growth of well-faceted three dimensional LaFeAsO single crystals.
Solid state single crystal growth is used instead of flux growth.
Crystal size of up to 2 × 3 × 0.4 mm3.
Characterization of structure, composition, magnetic, thermodynamic properties.


Solid state single crystal growth (SSCG) is a crystal growth technique where crystals are grown from a polycrystalline matrix. Here, we present single crystals of the iron pnictide LaFeAsO grown via SSCG using NaAs as a liquid phase to aid crystallization. The size of the as-grown crystals are up to 2 × 3 × 0.4 mm3. Typical for this method, but very uncommon for crystals of the pnictide superconductors and especially for the oxypnictides, the crystals show pronounced facets caused by considerable growth in c direction. The crystals were characterized regarding their composition, structure, magnetic, and thermodynamic properties. This sets the stage for further measurements for which single crystals are crucial such as any c axis and reciprocal space dependent measurements.
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