绝缘氧化物超晶格的高温超导性
High Tc superconductivity in superlattices of insulating oxides
摘要：
我们报告的超导电性的发生，最大Tc = 40 K，在超晶格（SL）的基础上的两个绝缘氧化物，即CaCuO 2和SrTiO 3。在这些（CaCuO_2）_n/（SrTiO_3）_m超导体中，CuO_2晶面只属于CaCuO_2块，它是一种反铁磁绝缘体。超导电性，仅限于少数单位电池在CaCuO 2/SrTiO 3界面，显示只有当SL生长在一个高度氧化的气氛中，因为额外的氧离子进入界面。有证据表明，空穴掺杂的CuO 2平面是通过从界面层，作为电荷库的电荷转移。
英文摘要：
We report the occurrence of superconductivity, with maximum Tc = 40 K, in superlattices (SLs) based on two insulating oxides, namely CaCuO2 and SrTiO3. In these (CaCuO2)n/(SrTiO3)m SLs, the CuO2 planes belong only to CaCuO2 block, which is an antiferromagnetic insulator. Superconductivity, confined within few unit cells at the CaCuO2/SrTiO3 interface, shows up only when the SLs are grown in a highly oxidizing atmosphere, because of extra oxygen ions entering at the interfaces. Evidence is reported that the hole doping of the CuO2 planes is obtained by charge transfer from the interface layers, which act as charge reservoir.
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