生长温度、氧压、激光能量密度和后退火对超导LaAlO/KTaO(111)界面输运性质的影响。

Effects of growth temperature, oxygen pressure, laser fluence and postannealing on transport properties of superconducting LaAlO/KTaO(111) interfaces.

作者信息

Sun Yanqiu, Liu Yuan, Pan Wenze, Xie Yanwu

机构信息

Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.

Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.

出版信息

J Phys Condens Matter. 2022 Sep 7;34(44). doi: 10.1088/1361-648X/ac8cc8.

DOI:10.1088/1361-648X/ac8cc8

PMID:36007513

Abstract

The recent discovery of superconductivity at EuO (or LaAlO)/KTaOinterfaces has attracted considerable research interest. However, an extensive study on growth of these interfaces is still lacking. In this work, we have fabricated LaAlO/KTaO(111) interfaces by growing LaAlOthin films on KTaO(111) single-crystalline substrates by pulsed laser deposition. We investigated the effects of growth temperature, oxygen pressure, laser fluence, and postannealing on transport properties. We found that all these key growth parameters show important effects on transport properties, and discussed their possible mechanisms. Our present study provides useful knowledge to further optimize these interfaces.

摘要

最近在氧化铕（或镧铝氧化物）/钽酸钾界面发现的超导现象引起了相当大的研究兴趣。然而，目前仍缺乏对这些界面生长的广泛研究。在这项工作中，我们通过脉冲激光沉积在钽酸钾（111）单晶衬底上生长镧铝氧化物薄膜，制备了镧铝氧化物/钽酸钾（111）界面。我们研究了生长温度、氧压、激光能量密度和退火对输运性质的影响。我们发现所有这些关键生长参数对输运性质都有重要影响，并讨论了其可能的机制。我们目前的研究为进一步优化这些界面提供了有用的知识。