Preparation, characterization, and superconducting properties of tetragonalLaBaCaCu3O7+

Magnetic Properties of the Superconductor LaCaBaCu3O7~!2010-02-11~!2010-04-01~!2010-06-29~!

“…Thus, γ for LaCaBaCu 3 O 7 is 37.2mJ/K 2 mol. This value is different from that obtained by Peng and co-workers for La1113 γ=48.1mJ/K 2 mol [14] when applying 30kOe external magnetic field and fitting the susceptibility with two linear functions.…”

“…However, another interesting HTCS which could help us to find any possible relationship between structural and magnetic properties is LaCaBaCu 3 O 7 (La1113). The two main characteristics which make La1113 attractive are (i) that its T C is above the boiling temperature of liquid nitrogen (T C ≈80K [10][11][12][13][14]) and (ii) that its structure is tetragonal similar to the non-superconductor YBa 2 Cu 3 O 6 (YBCO-6) [15][16][17]. Fig.…”

Characterization of polycrystalline LaBaCaCu3O7−δ superconductors in the fluctuation regime

“…Temperature dependence of resistivity and AC susceptibility The room temperature resistivity is of the same order of magnitude of that obtained by other researches [6][7][8] and is significantly larger than in YBCO. The transition temperature T c was defined as a temperature at which dq/dT shows the maximum value.…”

Structural properties of CaLaBaCu3O7-delta single crystals grown by self-flux method

“…[5,6,9,10] Consequently, there is no consensus of opinion on the stoichiometry ranges of single phase samples. According to those authors, the critical temperature reaches a maximum of 78 K in the composition Ca 0.5 LaBa 1.5 Cu 3 O 7−δ , not in the 1113 phase as we thought.…”

“…[2] The study of single-crystalline samples of this compound has a great interest, since its properties are unusual contrary to the conventional superconducting oxides. Despite its critical temperature being slightly lower, in this system the anisotropy factor is considerably smaller, consequently, the critical transport current density is raised [6], which represents a greater possibility of technological application.…”