<?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%">V. Likodimos</style></author><author><style face="normal" font="default" size="100%">Guskos, N.</style></author><author><style face="normal" font="default" size="100%">Palios, G.</style></author><author><style face="normal" font="default" size="100%">Koufoudakis, A.</style></author><author><style face="normal" font="default" size="100%">Typek, J.</style></author><author><style face="normal" font="default" size="100%">Bojanowski, B.</style></author><author><style face="normal" font="default" size="100%">Wabia, M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">EPR study of localized Cu2+ paramagnetic ions and Cu2+ pairs in the oxygen-deficient PrBa2Cu3O6+x and Pr0.5R0.5Ba2Cu3O6+x (R=Y,Er) compounds</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%">1995</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-0342698280&amp;doi=10.1103%2fPhysRevB.52.7682&amp;partnerID=40&amp;md5=c99ef95655ceeffa580f2c9346841f58</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">10</style></number><volume><style face="normal" font="default" size="100%">52</style></volume><pages><style face="normal" font="default" size="100%">7682-7688</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Low-temperature EPR measurements are presented for the PrBa2Cu3O6+x and Pr0.5R0.5Ba2Cu3O6+x (R=Y,Er) compounds with oxygen deficiency (tetragonal phase). The nuclear hyperfine interaction of the Cu2+ ions has been observed in both compounds. The origin of the Cu2+ EPR spectra has been associated with localized divalent copper ions in the Cu(1) sites. A time-induced transformation of the Cu2+ local crystal-field symmetry from orthorhombic to tetragonal, related to the oxygen distribution in the Cu(1) plane, has been detected. The EPR spectra of pairs of weakly exchange-coupled divalent copper ions were also observed. These copper pairs are suggested to occur in the Cu(1) planes and to be magnetically isolated from the antiferromagnetic CuO2 planes. © 1995 The American Physical Society.</style></abstract><notes><style face="normal" font="default" size="100%">cited By 18</style></notes></record></records></xml>