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- W2076005061 abstract "Oriented powdered samples of YBa2Cu3O7 were prepared by exposing the mechanically vibrated powder at 4.5 K to a magnetic field of 1.2 T. NMR experiments on 63,65Cu were performed and the results are compared with those of non-oriented samples. The data confirm the assignment of νQ1 ≅ 22 MHz to the Cu(1) and νQ2 ≅ 31.5 MHz to the Cu(2) sites. By means of the less common low-field NMR technique (νLarmor < νQuadrupole) the asymmetry parameter at the Cu(2) sites was determined to be η < 0.01, and at 100 K the Knight shift in the (a,b) plane was found to be K⊥ = (0.35 ± 0.1)% which is about a factor 2 smaller than the values reported in literature so far. Using published NMR data for 63Cu in Cu2O and in antiferromagnetic YBa2Cu3O6, our results are indicative for fluctuations of the Cu(1) ions between the ionic states Cu+ and Cu3+, and of the Cu(2) ions between Cu+ and Cu2+." @default.
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- W2076005061 date "1988-10-01" @default.
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- W2076005061 title "NMR investigations on oriented grains of superconducting YBa2Cu3O7" @default.
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- W2076005061 doi "https://doi.org/10.1016/0038-1098(88)91110-6" @default.
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