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arXiv 0909.0612cond-mat.supr-con
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YBa2Cu3O6 +d中60 K到90 K相变的渗流性质

Percolative nature of the transition from 60 K to 90 K phase in YBa2Cu3O6+d

S. Yu. Gavrilkin, O. M. Ivanenko, V. P. Martovitskii, K. V. Mitsen, A. Yu. Tsvetkov

摘要:

在1.8 ~ 300 K温度范围内,测量了YBa_2Cu_3 O_(6 +d)(0.7<d<0.8)的热容。发现掺杂对比热跃变和热容跃变温度的依赖性与空间均匀电子密度的假设相矛盾。结果表明,60 K相到90 K相的转变具有明显的非对称性,低掺杂60 K相的结构可以看作是镶嵌在绝缘基体中的超导纳米团簇阵列。

英文摘要:

We have measured the heat capacity of YBa2Cu3O6+d for 0.7<d<0.8 between 1.8 and 300K. It was found that doping dependences of specific heat jump and temperature of heat capacity jump contradict to the assumption of spatially homogeneous electronic density. The results suggest that the transition from 60K to 90K phase has a percolative nature and the structure of underdoped 60K phase can be considered as array of superconducting nanoclusters embedded in the insulating matrix.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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