Infinite-layer/perovskite oxide heterostructure-induced high-spin states in SrCuO2/SrRuO3 bilayer films

Zhe Li; Xiaobing Chen; Yuansha Chen; Qinghua Zhang; Hui Zhang; Jine Zhang; Wenxiao Shi; Bin He; Jinxing Zhang; Jinghua Song; Furong Han; Banggui Liu; Lin Gu; Fengxia Hu; Yunzhong Chen; Baogen Shen; Jirong Sun

doi:10.1039/D1MH01385H

Infinite-layer/perovskite oxide heterostructure-induced high-spin states in SrCuO₂/SrRuO₃ bilayer films†

Zhe Li,‡^ab Xiaobing Chen,‡^ab Yuansha Chen,

*^abc Qinghua Zhang,^ab Hui Zhang,^ab Jine Zhang,^ab Wenxiao Shi,^ab Bin He,^d Jinxing Zhang,^e Jinghua Song,^ab Furong Han,^ab Banggui Liu,

^ab Lin Gu,

^ab Fengxia Hu,

^ab Yunzhong Chen,^ab Baogen Shen^ab and Jirong Sun

*^abdf

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* Corresponding authors

^a Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
E-mail: yschen@iphy.ac.cn, jrsun@iphy.ac.cn

^b School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

^c Fujian Innovation Academy, Chinese Academy of Sciences, Fuzhou, Fujian 350108, China

^d Spintronics Institute, School of Physics and Technology, University of Jinan, Jinan 250022, China

^e Department of Physics, Beijing Normal University, Beijing 100875, China

^f Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China

Abstract

Heterostructures composed of dissimilar oxides with different properties offer opportunities to develop emergent devices with desired functionalities. A key feature of oxide heterostructures is interface electronics and orbital reconstructions. Here, we combined infinite-layered SrCuO₂ and perovskite SrRuO₃ into heterostructures. A rare high spin state as large as 3.0 μ_B f.u⁻¹ and an increase in Curie temperature by 12 K are achieved in an ultrathin SrRuO₃ film capped by a SrCuO₂ layer. Atomic-scale lattice imaging shows the uniform CuO₂-plane-to-RuO₅-pyramid connection at the interface, where the regularly arranged RuO₅ pyramids were elongated along the out-of-plane direction. As revealed by theoretical calculations and spectral analysis, these features finally result in an abnormally high spin state of the interfacial Ru ions with highly polarized e_g orbitals. The present work demonstrates that oxygen coordination engineering at the infinite-layer/perovskite oxide interface is a promising approach towards advanced oxide electronics.

Materials Horizons

Infinite-layer/perovskite oxide heterostructure-induced high-spin states in SrCuO₂/SrRuO₃ bilayer films†

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