737 research outputs found

    Superconducting properties of novel BiSe2_{2}-based layered LaO1βˆ’x_{1-x}Fx_{x}BiSe2_{2} single crystals

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    F-doped LaOBiSe2_{2} superconducting single crystals with typical size of 2Γ—\times4Γ—\times0.2 mm3^{3} are successfully grown by flux method and the superconducting properties are studied. Both the superconducting transition temperature and the shielding volume fraction are effectively improved with fluorine doping. The LaO0.48_{0.48}F0.52_{0.52}BiSe1.93_{1.93} sample exhibits zero-resistivity at 3.7 K, which is higher than that of the LaO0.5_{0.5}F0.5_{0.5}BiSe2_{2} polycrystalline sample (2.4K). Bulk superconductivity is confirmed by a clear specific-heat jump at the associated temperature. The samples exhibit strong anisotropy and the anisotropy parameter is about 30, as estimated by the upper critical field and effective mass modelComment: 5 pages, 5 figures, 2 tables, accepted for publication in Europhysics Lette

    1,4-Bis[2-(2-pyridΒ­yl)-1H-imidazol-1-yl]butane

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    The title compound, C20H20N6, was isolated from dimethyl sulfoxide solution using 2-(1H-imidazol-2-yl)pyridine and 1,4-dichloroΒ­butane in the presence of NaOH
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