Abstract
Premelted YBa 2Cu 3O 7− x was mixed with a BaCuO 2−CuO flux and formed into a boule melting the fed powder under laser-heating. Holding the boule at 910°C, the surplus flux was removed by melting and YBa 2Cu 3O 7− x crystals were extracted. The size of the crystals was from 0.01×0.01 to 0.5×0.5 mm with 0.02V0.04mm in thickness. After annealing at 600°C the crystals became superconducting with the transition temperature at 92 K. Interference contrast microscopy revealed microstep line structures on the as-grown crystal surfaces as well as domain structures in the orthorhombic phase. It was found that the crystallographic orientation of the orthorhombic lattice could be determined from the contrast of the domains in the microscope.
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