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Strain‐Mediated Inverse Photoresistivity in SrRuO 3 /La 0.7 Sr 0.3 MnO 3 Superlattices
Author(s) -
Liu HengJui,
Wei TzuChiao,
Zhu YuanMin,
Liu RuiRui,
Tzeng WenYen,
Tsai ChihYa,
Zhan Qian,
Luo ChihWei,
Yu Pu,
He JrHau,
Chu YingHao,
He Qing
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201503912
Subject(s) - superlattice , materials science , colossal magnetoresistance , condensed matter physics , heterojunction , strain engineering , oxide , magnetoresistance , manganite , reciprocal lattice , optoelectronics , ferromagnetism , diffraction , magnetic field , optics , physics , silicon , metallurgy , quantum mechanics
In the pursuit of novel functionalities by utilizing the lattice degree of freedom in complex oxide heterostructure, the control mechanism through direct strain manipulation across the interfaces is still under development, especially with various stimuli, such as electric field, magnetic field, light, etc. In this study, the superlattices consisting of colossal‐magnetoresistive manganites La 0.7 Sr 0.3 MnO 3 (LSMO) and photostrictive SrRuO 3 (SRO) have been designed to investigate the light‐dependent controllability of lattice order in the corresponding functionalities and rich interface physics. Two substrates, SrTiO 3 (STO) and LaAlO 3 (LAO), have been employed to provide the different strain environments to the superlattice system, in which the LSMO sublayers exhibit different orbital occupations. Subsequently, by introducing light, we can modulate the strain state and orbital preference of LSMO sublayers through light‐induced expansion of SRO sublayers, leading to surprisingly opposite changes in photoresistivity. The observed photoresistivity decreases in the superlattice grown on STO substrate while increases in the superlattice grown on LAO substrate under light illumination. This work has presented a model system that demonstrates the manipulation of orbital–lattice coupling and the resultant functionalities in artificial oxide superlattices via light stimulus.