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3D strain-induced superconductivity in La2CuO4+? using a simple vertically aligned nanocomposite approach.


ABSTRACT: A long-term goal for superconductors is to increase the superconducting transition temperature, T C. In cuprates, T C depends strongly on the out-of-plane Cu-apical oxygen distance and the in-plane Cu-O distance, but there has been little attention paid to tuning them independently. Here, in simply grown, self-assembled, vertically aligned nanocomposite thin films of La2CuO4+? + LaCuO3, by strongly increasing out-of-plane distances without reducing in-plane distances (three-dimensional strain engineering), we achieve superconductivity up to 50 K in the vertical interface regions, spaced ~50 nm apart. No additional process to supply excess oxygen, e.g., by ozone or high-pressure oxygen annealing, was required, as is normally the case for plain La2CuO4+? films. Our proof-of-concept work represents an entirely new approach to increasing T C in cuprates or other superconductors.

SUBMITTER: Choi EM 

PROVIDER: S-EPMC6486216 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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3D strain-induced superconductivity in La<sub>2</sub>CuO<sub>4+δ</sub> using a simple vertically aligned nanocomposite approach.

Choi Eun-Mi EM   Di Bernardo Angelo A   Zhu Bonan B   Lu Ping P   Alpern Hen H   Zhang Kelvin H L KHL   Shapira Tamar T   Feighan John J   Sun Xing X   Robinson Jason J   Paltiel Yossi Y   Millo Oded O   Wang Haiyan H   Jia Quanxi Q   MacManus-Driscoll Judith L JL  

Science advances 20190426 4


A long-term goal for superconductors is to increase the superconducting transition temperature, <i>T</i> <sub>C</sub>. In cuprates, <i>T</i> <sub>C</sub> depends strongly on the out-of-plane Cu-apical oxygen distance and the in-plane Cu-O distance, but there has been little attention paid to tuning them independently. Here, in simply grown, self-assembled, vertically aligned nanocomposite thin films of La<sub>2</sub>CuO<sub>4+δ</sub> + LaCuO<sub>3</sub>, by strongly increasing out-of-plane dista  ...[more]

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