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A 89Y NMR study of YBa2Cu4O8

โœ Scribed by R. Dupree; Z.P. Han; D. McK.Paul; T.G.N. Babu; C. Greaves

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
154 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

High resolution sq NMR shift and relaxation time measurements on YBa#r,+Os have been performed between 80 and 38OK. The shift at room temperature, --5 YBa$&074 and the relaxation time is longer. Below -2 I!@ m, is somewhat smaller than for fully oxygenated YBa2Cu306+s A comparison of the shift with the the shrft starts to decrease rapidly, behaving very like 63Cu,(2) data shows that they have the same temperature dependence, indicating a common susceptibility, and that the ratio of the 63Cu,(2) to 89y hyperfine coupling constants is the same as for YBa$u30 like but is similar to that of YBa$&

4. a

The temperature dependence of the relaxation behaviour is not Korrings 6.5.

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sgy NMR has been used to study the effect of a range of substitutions (V, Fe, Co, Ni, Zn, AI and Ga) for Cu in YBa2(Cut\_xMx)~OT. A different behaviour is observed for the substitutions (Fe, Co, Ai and Ga), which go into the chain site and change the structure to tetragonal, compared to the other su