铜酸盐
超导电性
凝聚态物理
库仑
材料科学
薄膜
基质(水族馆)
兴奋剂
拉伤
邻近效应(电子束光刻)
转变温度
物理
纳米技术
量子力学
图层(电子)
电子
地质学
电子束光刻
内科学
海洋学
医学
抵抗
作者
Oleh Ivashko,M. Horio,Wenjie Wan,Niels Bech Christensen,Daniel McNally,E. Paris,Yi Tseng,N. E. Shaik,Henrik M. Rønnow,Haofei I. Wei,Carolina Adamo,Céline Lichtensteiger,Marta Gibert,M. R. Beasley,Kyle Shen,Jan M. Tomczak,Thorsten Schmitt,J. Chang
标识
DOI:10.1038/s41467-019-08664-6
摘要
The transition temperature Tc of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La2-xSrxCuO4 thin films, such substrates are sub-optimal and the highest Tc is instead obtained using LaSrAlO4. An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in Tc and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La2CuO4 thin films can be enhanced by compressive strain. Our experiments and theoretical calculations establish that the substrate producing the largest Tc under doping also generates the largest nearest neighbour hopping integral, Coulomb and magnetic-exchange interaction. We hence suggest optimising the parent Mott state as a strategy for enhancing the superconducting transition temperature in cuprates.
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