Electromagnetic properties of melt-grown YBaCuO superconductors doped by Gd and Sm

0433328 - FZÚ 2015 RIV PL eng C - Konferenční příspěvek (zahraniční konf.)
Jirsa, Miloš - Rameš, Michal - Volochová, D. - Radušovská, M. - Diko, P.
Electromagnetic properties of melt-grown YBaCuO superconductors doped by Gd and Sm.
Acta Physica Polonica A, vol. 126, 2014, č. 1. Warsaw: Polish Academy of Sciences, 2014, s. 326-327. ISSN 0587-4246. E-ISSN 1898-794X.
[Czech and Slovak Conference on Magnetism /15./. Košice (CZ), 17.06.2013-21.06.2013]
Grant CEP: GA ČR(CZ) GAP107/11/0391
Institucionální podpora: RVO:68378271
Klíčová slova: YBaCuO * bulk high-Tc superconductors * Sm doping * Gd doping * electromagnetic properties
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Electromagnetic properties of YBa2Cu3Oy samples melt-grown in air and doped with small amounts of light rare earth (LRE) ions Gd and Sm were studied. The LRE doping creates a point-like disorder contributing to the second peak on the magnetization curve. In the _eld range of the second peak the average magnetic moment,Mav, deduced from the magnetization curves exhibited strong _uctuations. Mav is commonly regarded as an equilibrium moment close to the thermodynamic reversible one, obeying in intermediate _elds a logarithmic _eld dependence. However, in our experiments Mav(B) curves failed to follow such a dependence below irreversibility line. Mav(B) curves deduced from rather static measurements, done by SQUID magnetometer still showed the disturbance but signi_cantly weaker. It indicates that this feature re_ects the vortex dynamics in the second peak region. Its scaling with temperature was found to coincide with that of the pinning force.
Trvalý link: http://hdl.handle.net/11104/0237556