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- W1568757757 abstract "The discovery of superconductivity in magnesium diboride (MgB2, with a critical temperature of 39 K, observed in January 2001) has generated enormous interest and excitement in the superconductivity community and the world in general, especially for those involved in researching superconductivity in non-oxides and boron related compounds. MgB2 possesses an AlB2-type hexagonal structure (space group P6/mmm) with alternating boron honeycomb planes and magnesium triangular planes. Each Mg atom is located at the center of a hexagon formed by boron atoms, and it donates its electron to the boron planes; hence, the B-B bonding is strongly anisotropic. The unit cell parameters are a = 0.3086 nm and c = 0.3524 nm at room temperature. These values for the lattice parameters of MgB2 are in the middle of the values of lattice parameters of AlB2-type compounds. Owing to the simple hexagonal structure with space group P6/mmm, four optical modes at the Г point of the Brillouin zone are predicted for MgB2: a silent B1g mode (at 87.1 meV, ~700 cm), the E2g Raman mode (at 74.5 meV, ~600 cm), and the infrared active E1u (at 40.7 meV, ~330 cm) and A2u (at 49.8 meV, ~400 cm) modes. The E2g mode is responsible for the high critical temperature, Tc, in MgB2. Further studies based on a number of experimental techniques, such as angleresolved photoemission spectroscopy (ARPES), the de Haas-van Alphen effect, and the Hall resistivity, have found that MgB2 exhibits a rich multiple-band structure. These results are in agreement with band structure calculations and reveal strongly" @default.
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- W1568757757 date "2010-01-01" @default.
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- W1568757757 title "Explorations of Superconductivity Mechanism and High Critical Current Performance of MgB2" @default.
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