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Numerous studies are conducted to explain the synthesis, as well as the variouss physical properties of the Fe[Se.sub.1/2][Te.sub.1/2] superconductor. An applied magnetic field is shown to lead to a decreese in the bulk superconductivity of the system.

A study was conducted to evaluate the critical superconducting parameters of Mg[B.sub.2-x][C.sub.x] system using high field magnetization and magnetotransport measurement. Findings results in substantial enhancement of critical parameters such as [H.sub.c2], [H.sub.irr] and [J.sub.c](H) in comparison to pure Mg[B.sub.2] superconductor.

The intercomparison of the superconductivity of Mg[B.sub.2], Al[B.sub.2], Nb[B.sub.2+x] is presented. The nonstoichiometry has induced an increase in c parameter with Boron excess both in Nb[B.sub.2+x] and Ta[B.sub.2+x] and magnetization and resistivity measurements in case of niobium boride samples have shown the absence of superconductivity in stoichiometric Nb[B.sub.2] sample.

The magnetization of a polycrystalline Mg[B.sub.2] compound, which has displayed a paramagnetic Meissner effect in the field-cooled (FC) magnetic branch and competitive critical current densities, is studied. It is shown that the flux avalanches are symmetric in both increasing/decreasing the field in all four quadrants of the magnetization loops.