科研之友
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摘要
A limiting factor in the ability to interpret isotope effect measurements in cuprates is the absence of sufficiently accurate data for the whole phase diagram; there is precise data for T(c), but not for the antiferromagnetic transition temperature T(N). Extreme sensitivity of T(N) to small changes in the amount of oxygen in the sample is the major problem. This problem is solved here by using the novel compound (Ca(0.1)La(0.9))(Ba(1.65)La(0.35))Cu(3)O(y) for which there is a region where T(N) is independent of oxygen doping. Meticulous measurements of T(N) for samples with (16)O and (18)O find the absence of an oxygen isotope effect on T(N) with unprecedented accuracy. A possible interpretation of our finding and existing data is that isotope substitution affects the normal state charge carrier density.
- 出版日期2011
