Crystal growth and characterization of MgB2: Relation between structure and superconducting properties

Details Crystal growth and characterization of MgB2: Relation between structure and superconducting properties Crystal growth and characterization of MgB2: Relation between structure and superconducting properties

2002-07-10

arxiv.org/abs/cond-mat/0207247v1

Physics

Condensed Matter

Superconductivity

29 pages, 9 figures, 1 table, Proc.of International Workshop on Superconductivity in Magnesium Diboride and Related Materials

Scientific paper

10.1088/0953-2048/16/2/316

We discuss the important aspects of synthesis and crystal growth of MgB2 under high pressure (P) and temperature (T) in Mg-B-N system, including the optimisation of P-T conditions for reproducible crystal growth, the role of liquid phases in this process, the temperature dependence of crystal size and the effect of growing instabilities on single crystals morphology. Extensive experiments have been carried out on single crystals with slightly different lattice constants and defects concentration, which revealed and possible effects of Mg-deficiency and lattice strain on the superconducting properties of MgB2 (Tc, Jc, residual resistivity ratio, anisotropy etc.).

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