Abstract
We report on the observation of Cu-EPR signals in single crystalline material of YBa2Cu3O6+δ in the narrow oxygen concentration range 0.7<δ<0.9 and for temperatures 80 K<T<200 K. We provide evidence that the signal results from Cu2+ ions located in ⋯Cu(1)⋯O⋯Cu(1)⋯ chain fragments.
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