@article{3047521,
    title = "EPR STUDY OF LOCALIZED CU2+ PARAMAGNETIC-IONS AND CU2+ PAIRS IN THE
OXYGEN-DEFICIENT PRBA2CU3O6+X AND PR(0.5)R(0.5)BA(2)CU(3)O(6+X) (R=Y,ER)
COMPOUNDS",
    author = "LIKODIMOS, V and GUSKOS, N and PALIOS, G and KOUFOUDAKIS, A and TYPEK, J and and BOJANOWSKI, B and WABIA, M",
    journal = "Physical Review B",
    year = "1995",
    volume = "52",
    number = "10",
    pages = "7682-7688",
    publisher = "AMER PHYSICAL SOC",
    issn = "2469-9950, 2469-9969",
    doi = "10.1103/PhysRevB.52.7682",
    abstract = "Low-temperature EPR measurements are presented for the PrBa2Cu3O6+x and
Pr(0.5)R(0.5)Ba(2)Cu(3)O(6+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-held 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."
}