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Tailoring of magnetism & electron transport of manganate thin films by controlling the Mn-O-Mn bond angles via strain engineering.


ABSTRACT: Strain engineering beyond substrate limitation of colossal magnetoresistant thin (La0.6Pr0.4)0.7Ca0.3MnO3 (LPCMO) films on LaAlO3-buffered SrTiO3 (LAO/STO) substrates has been demonstrated using metalorganic aerosol deposition technique. By growing partially relaxed 7-27 nm thick heteroepitaxial LAO buffer layers on STO a perfect lattice matching to the LPCMO has been achieved. As a result, strain-free heteroepitaxial 10-20 nm thick LPCMO/LAO/STO films with bulk-like ferromagnetic metallic ground state were obtained. Without buffer the coherently strained thin LPCMO/STO and LPCMO/LAO films were insulating and weakly magnetic. The reason for the optimized magnetotransport in strain-free LPCMO films was found to be a large octahedral Mn-O-Mn bond angle φOOR ~ 166-168° as compared to the significantly smaller one of φOOR ~ 152-156° determined for the tensile (LPCMO/STO) and compressively (LPCMO/LAO) strained films.

SUBMITTER: Henning P 

PROVIDER: S-EPMC10853165 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature

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Tailoring of magnetism & electron transport of manganate thin films by controlling the Mn-O-Mn bond angles via strain engineering.

Henning P P   Gruhl R R   Ross U U   Roddatis V V   Bruchmann-Bamberg V V   Stroh K P KP   Seibt M M   Gegenwart P P   Moshnyaga V V  

Scientific reports 20240208 1


Strain engineering beyond substrate limitation of colossal magnetoresistant thin (La<sub>0.6</sub>Pr<sub>0.4</sub>)<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> (LPCMO) films on LaAlO<sub>3</sub>-buffered SrTiO<sub>3</sub> (LAO/STO) substrates has been demonstrated using metalorganic aerosol deposition technique. By growing partially relaxed 7-27 nm thick heteroepitaxial LAO buffer layers on STO a perfect lattice matching to the LPCMO has been achieved. As a result, strain-free heteroepitaxial 1  ...[more]

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