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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Cu nuclear quadrupole resonance study of substituently induced disorder in Y1-xCaxBa2-xLaxCu4O8
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Cu nuclear quadrupole resonance study of substituently induced disorder in Y1-xCaxBa2-xLaxCu4O8

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摘要

Cu nuclear quadrupole resonance (NQR) measurements have been made on Y1-xCaxBa2-xLaxCu4O8 to study the effects of disorder on the electronic state in samples where codoping with Ca and La ensures that there is no large change in the number of doped holes per Cu. It is found that there is a systematic increase in the static charge disorder induced by codoping. There is also a small increase in the Cu spin-lattice relaxation rate 1/T-63(1) for temperatures above the superconducting transition temperature T-c, which can be accounted for by a small decrease in the normal-state pseudogap energy. 1/T-63(1) does not follow the expected T-3 temperature dependence for temperatures far below T-c, which may be a consequence of the inhomogeneous electronic state. However, there is no evidence that codoping induced disorder leads to any reduction in the Cu NQR intensity for temperatures above T-c, even though the average hole concentration is close to the boundary where a reduction in the Cu NMR intensity might be expected.

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