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Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.37: Poster

Wednesday, September 7, 2022, 16:00–18:00, P3

Stabilization of ferromagnetic metallic ground state in epitaxial (La1−yPry)0.7Ca0.3MnO3 /SrTiO3 thin films by using buffer layers — •Pia Henning1, Karen Stroh1, Vitaly Bruchmann-Bamberg1, Oleg Shapoval2, and Vasily Moshnyaga11Erstes Physikalisches Institut, Georg-August-Universitat-Göttingen, Gottingen, Germany — 2IIEN, Academy of Sciences of Republic Moldova, Chisinau, Republic of Moldova

(La1−yPry)0.7Ca0.3MnO3 (LPCMO) is an A-site substituted perovskite manganite, mostly known for the colossal magnetoresistance (CMR) effect. Relatively thick, d=50-100 nm, and stress-free LPCMO films with coupled ferro/paramagnetic and metal/insulator transition (MIT) and CMR ∼104% can be heteroepitaxially grown by the metalorganic aerosol deposition technique on MgO(200) substrates, where strain relief occurs due to misfit dislocations. However, thin LPCMO films d<20 nm on MgO(200) do not show MIT and CMR. Alternatively, LPCMO/SrTiO3 (LPCMO/STO) films grow coherently strained and with smooth surface morphology, however lacking the MIT and CMR even for d>50 nm. To obtain epitaxial LPCMO films with optimal metal-insulator transition sharpness and temperature we have employed a strain-engineered LaAlO3 buffer layer to bridge the lattice mismatch of the LPCMO film and SrTiO3(100) substrate. The influence of LaAlO3 buffers on the magnetic and electric properties of epitaxial LPCMO films was studied. A high-quality growth of LPCMO/LAO/STO films and stabilization of the ferromagnetic-metallic phase for 10 nm thick LPCMO films were demonstrated.

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