Marcello Gombos

Reactivity between Nd1+xBa2−xCu3O7−δ+x/2 and Nd4−2zBa2+2zCu2−zO10−2z phases in superconducting NdBaCuO powders and melt textured bulk samples

The high temperature reaction between the superconducting Nd123(x) (Nd1+xBa2−xCu3O7−δ+x/2) phase and Nd422(z) (Nd4−2zBa2+2zCu2−zO10−2z), leading to substitutions of Nd in the Ba sites of Nd123, was analysed. For this purpose, differential thermal analysis (DTA) was performed on powders with different Nd422 addition. Measurement results were compared with the values, reported in the literature, of the peritectic temperatures in function of Nd123 substitution. The superconducting transition critical temperature analysis of melt-textured samples shows that the use of Barium rich Nd422 allows significant improvements of the superconducting parameters of produced samples, avoiding the occurrence of the Nd–Ba substitutions.

Pairing state in the ruthenocuprate superconductor Ru Sr 2 Gd Cu 2 O 8 : A point-contact Andreev reflection spectroscopy study

The results of point contact Andreev reflection spectroscopy on polycrystalline

Mechanical fragility and tri-dimensional crack structure in NdBaCuO top seeded and multi-seeded melt-textured samples

\mathrm{Ru}{\mathrm{Sr}}_{2}\mathrm{Gd}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8}

Correlation between the formation of growth bands and Nd210 addition in Nd/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// bulk samples

pellets are presented. The wide variety of the measured spectra are all explained in terms of a modified Blonder\char21{}Tinkham\char21{}Klapwijk model considering a

Study of morphological and structural properties of multi-seeded NdBaCuO samples

d

Thermal characterization of GdSr 2 RuCu 2 O y -based mixtures in the GdSr 2 RuO 6 –CuO pseudobinary system

-wave symmetry of the superconducting order parameter. Remarkably low values of the energy gap

Morphological and structural study on GdSr/sub 2/RuCu/sub 2/O/sub 8/ melt-textured samples

\ensuremath{\Delta}=(2.8\ifmmode\pm\else\textpm\fi{}0.2)\phantom{\rule{0.3em}{0ex}}\mathrm{meV}

Reduced twinning efficiency and tri-dimensional crack structure in melt-textured NdBa2Cu3O7−δ bulk samples fragmentation process

and of the

Coexistence of Superconductivity and Magnetism in Ruthenocuprates

2\ensuremath{\Delta}∕{k}_{B}{T}_{c}\ensuremath{\simeq}2

Impact of the Starting Powder Composition on

ratio are inferred. From the temperature evolution of the