Pavlov Dmitrii P, Zagidullin Rustem R, Mukhortov Vladimir M, Kabanov Viktor V, Adachi Tadashi, Kawamata Takayuki, Koike Yoji, Mamin Rinat F
Zavoisky Physical-Technical Institute, FRC KazanSC of RAS, 420029 Kazan, Russia.
Southern Scientific Center of RAS, 344006 Rostov-on-Don, Russia.
Phys Rev Lett. 2019 Jun 14;122(23):237001. doi: 10.1103/PhysRevLett.122.237001.
We report the first observation of superconductivity in a heterostructure consisting of an insulating ferroelectric film (Ba_{0.8}Sr_{0.2}TiO_{3}) grown on an insulating parent compound of La_{2}CuO_{4} with [001] orientation. The heterostructure was prepared by magnetron sputtering on a nonatomically flat surface with inhomogeneities of the order of 1-2 nm. The measured superconducting transition temperature T_{c} is about 30 K. We have shown that superconductivity is confined near the interface region. Application of a weak magnetic field perpendicular to the interface leads to the appearance of the finite resistance. That confirms the quasi-two-dimensional nature of the superconductive state. The proposed concept promises ferroelectrically controlled interface superconductivity which offers the possibility of novel design of electronic devices.
我们报道了在一种异质结构中首次观察到超导性，该异质结构由生长在具有[001]取向的La₂CuO₄绝缘母体化合物上的绝缘铁电薄膜（Ba₀.₈Sr₀.₂TiO₃）组成。该异质结构是通过磁控溅射在具有1 - 2纳米量级不均匀性的非原子平面表面上制备的。测量得到的超导转变温度Tc约为30K。我们已经表明超导性局限于界面区域附近。施加垂直于界面的弱磁场会导致出现有限电阻。这证实了超导态的准二维性质。所提出的概念有望实现铁电控制的界面超导性，这为电子器件的新颖设计提供了可能性。
