High-pressure growth and characterization of bulk MnAs single crystals

Abstract

Bulk single crystals of manganese arsenide (MnAs) were grown from melt at 1 GPa and 1100 °C by using a cubic-anvil, high-pressure, and high-temperature technique. The as-grown black colored crystals extracted from solidified lump exhibit a plate-like morphology, with flat surfaces and maximum dimensions up to ~ 3 x 2 x 0.5 mm3. The hexagonal crystal structure at room temperature was confirmed by X-ray diffraction [B81, space group P63/mmc, No 194, Z = 2, a = 3.7173(4) Å, b = 3.7173(4) Å, c = 5.7054(8) Å, and V = 68.277(16) Å3]. Temperature-dependent magnetization measurements reveal the occurrence of a first-order ferro- to paramagnetic transition at Tc = 318.5 K accompanied by a hysteresis of ~ 9 K. The successful growth of relatively large crystals reported here might be extended to various substituted analogues of MnAs, thus opening new possibilities for further exploration of this interesting system.

arXiv admin note: text overlap with arXiv:1705.10491

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• Crystal growth and characterization of the antiperovskite superconductor MgC1-xNi3-y
• High-pressure high-temperature solution growth, structural, and superconducting properties of Fe-substituted MgB2 single crystals
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals
• Discovery of a new magnesium iron boride Mg4Fe1.1B13.9 in the Mg-Fe-B-N system