<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Pissas, M.</style></author><author><style face="normal" font="default" size="100%">Moraitakis, E.</style></author><author><style face="normal" font="default" size="100%">Stamopoulos, D.</style></author><author><style face="normal" font="default" size="100%">Papavassiliou, G.</style></author><author><style face="normal" font="default" size="100%">Psycharis, V</style></author><author><style face="normal" font="default" size="100%">Koutandos, S.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Surface barrier and bulk pinning in MgB2 superconductor</style></title><secondary-title><style face="normal" font="default" size="100%">JOURNAL OF SUPERCONDUCTIVITY</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2001</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2001</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">615 - 621</style></pages><isbn><style face="normal" font="default" size="100%">0896-1107</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We present a modified method of preparation of the new superconductor MgB2. The polycrystalline samples were characterized using X-ray and magnetic measurements. The surface barriers control the isothermal magnetization loops in powder samples. In bulk as prepared samples we always observed symmetric magnetization loops indicative of the presence of a bulk pinning mechanism. Magnetic relaxation measurements in the bulk sample reveal a crossover of surface barrier to bulk pinning.</style></abstract><issue><style face="normal" font="default" size="100%">5</style></issue></record></records></xml>