<?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%">Stamopoulos, D.</style></author><author><style face="normal" font="default" size="100%">Moraitakis, E.</style></author><author><style face="normal" font="default" size="100%">Kallias, G.</style></author><author><style face="normal" font="default" size="100%">Niarchos, D.</style></author><author><style face="normal" font="default" size="100%">Charalambous, M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Magnetic relaxation measurements in the region of the second magnetization peak in a HgBa2CuO4+delta single crystal</style></title><secondary-title><style face="normal" font="default" size="100%">PHYSICAL REVIEW B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1999</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1999</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">59</style></volume><pages><style face="normal" font="default" size="100%">12121 - 12126</style></pages><isbn><style face="normal" font="default" size="100%">2469-99502469-9969</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The temperature and magnetic-field dependence of activation energy U-o(T,H) for creep has been studied in an HgBa2CuO4+delta single crystal below and above the &quot;fishtail&quot; peak H-sp(T). At constant temperature, U-o(H) increases up to H-sp'(T) and then for H&gt;H-sp'(T) it decreases. H-sp'(T) is located lower than the field H-sp(T) deduced from the hysteresis loops. The decrease of the activation energy is probably indicative of a plastic-type creep of the vortex lattice. We demonstrate that the overall behavior of U-o(T,H) at the second magnetization peak line H-sp(T) in the phase diagram of HgBa2CuO4+delta exhibits similarities with that observed in Bi2Sr2CaCu2O8+delta and YBa2Cu3O6.95 compounds. [S0163-1829(99)04018-7].</style></abstract><issue><style face="normal" font="default" size="100%">18</style></issue></record></records></xml>