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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

Citation:

Likodimos V, Guskos N, Palios G, Koufoudakis A, Typek J, Bojanowski B, Wabia M. 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. Physical Review B [Internet]. 1995;52:7682-7688.

Abstract:

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.

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