CIMBERLE , Maria Roberta

The intermetallic perovskite MgCNi3, superconducting with a Tc of 8 K, is particularly interesting from several points of view: in spite of the large amount of nickel present the compound is not ferromagnetic; nevertheless band structure calculations put in evidence a Van Hove singularity just above the Fermi level suggesting that MgCNi3 is on...

GdSr2RuCu2O8 has been synthesized using a solid state reaction and has been characterized from the structural and physical points of view. The samples exhibit the well-known superconducting and magnetic behavior; in addition, an orthorhombic modification of the GdSr2RuCu2O8 lattice has been detected by both high resolution transmission electron...

A systematic study on the synthesis of the Ru-1212 compound by preparing a series of samples that were annealed at increasing temperatures and then quenched has been performed. It results that the optimal temperature for the annealing lies around 1060-1065 degreesC; a further temperature increase worsens the phase formation. Structural order is...