Tuning irreversible magnetoresistance in Pr0.67Sr0.33MnO3 film via octahedral rotation.

The oxygen octahedral rotation around out-of-plane axis is explored to study its effect on metastable status, magnetic cluster glass in manganite. The antiphase rotation around the out-of-plane axis (TiO6 a0a0c-) of SrTiO3 enhances the Mn-O bond anisotropy along in-plane and out-of-plane directions, and weakens the ferromagnetic interactions in 12 nm Pr0.67Sr0.33MnO3 film on (001) SrTiO3 substrate, which together promote the formation of magnetic cluster-glassiness and enlarges the irreversible magnetoresistance effect with enhanced relaxation time of charge carrier. The effect of TiO6 a0a0c- in SrTiO3 substrate on materials properties is obvious with large irreversible magnetoresistance effect for thin film, which fades away with the increase of film thickness. At 10 K, the irreversible magnetoresistance is 0.91 for 12 nm film, and 0.22 for 30 nm film. This work extends current understanding on interfacial coupling to metastable status, and could help to explore other systems in perovskite structure with octahedral rotation.