<?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%">Guskos, N.</style></author><author><style face="normal" font="default" size="100%">V. Likodimos</style></author><author><style face="normal" font="default" size="100%">Koufoudakis, A.</style></author><author><style face="normal" font="default" size="100%">Bojanowski, B.</style></author><author><style face="normal" font="default" size="100%">Typek, J.</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 Cu2+ ions in the Pr0.5RE0.5Ba2Cu3O6 + x compounds in tetragonal phase at low temperatures</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Magnetism and Magnetic Materials</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-s2.0-19244379343&amp;doi=10.1016%2f0304-8853%2894%2901433-7&amp;partnerID=40&amp;md5=4c887ec2510cb4313153255113779657</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">PART 2</style></number><volume><style face="normal" font="default" size="100%">140-144</style></volume><pages><style face="normal" font="default" size="100%">1319-1320</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Powdered samples of the Pr0.5RE0.5Ba2Cu3O6 + x compounds, where RE Yb, Ho, Tm, Er, and Y, were investigated by the EPR technique at low temperatures in the range 2.8-20 K. In the EPR spectra of these non-superconducting materials in tetragonal phase, resonance lines arising from the exchange interaction of coupled pairs of divalent copper ions and Cu2+ in the tetragonal local crystal field symmetry were recorded. Apart from the usually observed ΔMs = 1 and ΔMs = 2 transitions for the CuCu system, rarely reported singlet-triplet transitions were detected as well. The exchange parameter J has roughly the same value of about 0.12 cm-1 for all investigated samples and the zero-field splitting parameter D is of the order of 0.013 cm-1. It is suggested that formation of Cu(1)OCu(2) copper coupled pairs is responsible for the observed EPR spectrum. © 1995.</style></abstract><notes><style face="normal" font="default" size="100%">cited By 1</style></notes></record></records></xml>