engleski

Spectral, Superconducting and Magnetic Properties of Ba_2YCu_(3-x)M_xO_(7-delta)

The partial substitution of copper atoms in the superconducting system Ba_2YCu_(3-x)M_xO_(7-delta), M = V, Nb, Ta was investigated. The samples were prepared by the solid state reaction of BaCO_3 and metal oxides using subsequent isothermal treatment at 860°, 900° and 950°C. The infrared spectra indicated complete decarbonization of the samples. Superconducting transition was found at 90-93 K and higher Tc values were favoured by the presence of small amount of dopands. The signal in the EPR spectra obtained for the zero values of magnetic field was of considerable higher intensity than in the nonsubstituted samples. Spectral, superconducting and magnetic properties are discussed.

superconductivity; substitution effect; spectral properties; magnetic properties

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