We report the phase formation and superconductivity in [Y1-xCax]SrBaCu2.80(BO3) 0.20Oy with 0.10≤ x ≤ 0.50 prepared at normal pressure and temperature. The X-ray diffraction pattern shows that all samples have a tetragonal P4/mmm structure, indicating that the BO3 groups were incorporated in the structure. The ZFC magnetization versus temperature measurements under an applied field of 10 Oe using a SQUID magnetometer, show that the materials are superconductors, with Tc ≈ 77K, almost independently of the Ca content. The observed differences are related to the volume fraction of Meissner effect. In the temperature range 100-300K all samples show a typical Curie - Weiss behavior, under an applied high field of 20 KOe. © 2000 Elsevier Science B.V. All rightsreserved.
|Original language||American English|
|Number of pages||2|
|Journal||Physica C: Superconductivity and its Applications|
|State||Published - 1 Dec 2000|
Bustamante Domínguez, A. G., Barinotto C., V. H., Flores Santibañez, J., & Garcia, F. (2000). Phase formation and superconductivity in [Y<inf>1 x</inf> Ca<inf>x</inf>] SrBaCu <inf>2.80</inf> (BO<inf>3</inf>) <inf>0.20</inf>O<inf>y</inf> with 0.10 ≤ x ≤ 0.50. Physica C: Superconductivity and its Applications, 635-636.