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- W2016093239 abstract "NQR spectra of Cu-chain sites in ${mathrm{PrBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{6}$ crystals show below the N'eel temperature of Pr the presence of a transferred hyperfine field of ensuremath{approxeq}0.12 T from the Pr sublattice. The fields at the Cu-plane sites observed below 4.2 K are an order of magnitude larger. In contrast no field could be detected at the Cu chains in ${mathrm{PrBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7}$. The spectrum at the Cu-plane sites for high oxygen concentration indicates the existence of a transferred field similar to the one in the reduced sample. The large transferred fields are in direct contradiction to the antiferromagnetic structure generally assumed for the Pr moments. They strongly support the model of a broken Pr point symmetry at least in ${mathrm{PrBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{6}$. The most simple distortion of the tetragonal ${mathrm{PrO}}_{8}$ complex (${mathit{D}}_{4mathit{h}}$), which may give rise to the fields, is not to orthorhombic (${mathit{D}}_{2mathit{h}}$) as is usually assumed, but to ${mathit{C}}_{4mathit{v}}$. The results indicate that the Pr moments are perpendicular to the c axis and that the antiferromagnetic coupling along the c axis is distorted for the reduced sample. textcopyright{} 1996 The American Physical Society." @default.
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- W2016093239 title "Local magnetic properties ofPrBa2Cu3O6+x: NMR and NQR in crystals" @default.
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- W2016093239 doi "https://doi.org/10.1103/physrevb.53.229" @default.
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