Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2

Details Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2 Microstructure and pinning properties of hexagonal-disc shaped single crystalline MgB2

2002-03-06

arxiv.org/abs/cond-mat/0203123v1

Phys.Rev. B66 (2002) 184519

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures. submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.184519

We synthesized hexagonal-disc-shaped MgB2 single crystals under high-pressure conditions and analyzed the microstructure and pinning properties. The lattice constants and the Laue pattern of the crystals from X-ray micro-diffraction showed the crystal symmetry of MgB2. A thorough crystallographic mapping within a single crystal showed that the edge and c-axis of hexagonal-disc shape exactly matched the (10-10) and the (0001) directions of the MgB2 phase. Thus, these well-shaped single crystals may be the best candidates for studying the direction dependences of the physical properties. The magnetization curve and the magnetic hysteresis for these single crystals showed the existence of a wide reversible region and weak pinning properties, which supported our single crystals being very clean.

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