AI Article Synopsis
- * The superconductivity is particularly sensitive to the surface orientation of KTaO, indicating important differences from earlier systems like LaAlO/SrTiO.
- * Using ionic liquid (IL) gating, researchers achieved superconductivity on KTaO surfaces, suggesting that electron doping at the surfaces is key, and this method opens up new options for exploring the fundamental properties of superconductivity in KTaO.
Article Abstract
The recent discovery of superconductivity at the interfaces between KTaO and EuO (or LaAlO) gives birth to the second generation of oxide interface superconductors. This superconductivity exhibits a strong dependence on the surface plane of KTaO, in contrast to the seminal LaAlO/SrTiO interface, and the superconducting transition temperature is enhanced by one order of magnitude. For understanding its nature, a crucial issue arises: Is the formation of oxide interfaces indispensable for the occurrence of superconductivity? Exploiting ionic liquid (IL) gating, we are successful in achieving superconductivity at KTaO(111) and KTaO(110) surfaces with up to 2.0 and 1.0 K, respectively. This oxide-IL interface superconductivity provides a clear evidence that the essential physics of KTaO interface superconductivity lies in the KTaO surfaces doped with electrons. Moreover, the controllability with IL technique paves the way for studying the intrinsic superconductivity in KTaO.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9166623 | PMC |
| http://dx.doi.org/10.1126/sciadv.abn4273 | DOI Listing |
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