Correlation between microwave surface resistance, AC susceptibility and in-plane ordering in YBa2Cu3O7 thin films epitaxially grown on (100) MgO substrates

PbZr0.52Ti0.48O3 and SrBi2Nb2O9 ferroelectric oxides integrated with YBa2Cu3O7 superconductor in multilayers epitaxially grown by pulsed laser deposition

“…In contrast, fi gure illustrates the superconducting transition of YBaCuO which was routinely observed on SBN/(l 00)MgO as well as on SBN/(l00)SrTiO 3 at T c around 88.5 K. Moreover, the area under the x " peak (S(x. ")), a measurement of low frequency losses and which is strongly correlated to microwave losses [10], is in agreement with the low mixture of the two in-plane orientations (3 %) of the c-axis YBaCuO we have previously reported in the case of YBaCuO/MgO [ 1 0] . Then, the observed value of S(X, ") would imply a low surface resistance (smaller than 2 mQ).…”

Epitaxially grown ferroelectric thin films for agile devices

“…The morphology is very dense for films grown on LAO, with purely (100) oriented square-shaped grains, similarly to films grown on the model substrate STO. On MgO, with a misfit hardly larger in absolute value, a slight tendency to columnar growth is observed; grains are again (100)-oriented, mainly square-shaped, while a small amount of 45 in-plane rotated crystallites is observed, similarly to the example of YBa 2 Cu 3 O 7 films grown on MgO [120], for which the growth mechanism was clearly explained in the frame of the Near Site Coincidence Lattice model [121]. On R-plane sapphire, a major (100) orientation and a minor (110) one occur, in agreement with results published previously [122]; grains are mostly diamond shaped; the in-plane dispersion of about 8 for the best samples is related to the geometry of the terminal plane of the substrate (a 0 ¼ 3.48 Å and ¼ 86 ).…”

Surface Superconductivity Changes of Niobium Sheets by Femtosecond Laser-Induced Periodic Nanostructures

“…Note that the maximum of χ ″( H ) curves is lower (thus indicating lower AC losses, which represent the energy dissipation during a cycle), for the fs-laser processed samples, especially for those irradiated in Ar and N 2 atmosphere and for magnetic fields applied parallel to the induced nanostructures ( y -axis). This could suggest lower surface resistance in these samples and conditions [ 43 ].…”