TY - JOUR
T1 - Oxygen octahedral distortions in LaMO3/SrTiO3 superlattices
AU - Sanchez-Santolino, Gabriel
AU - Cabero, Mariona
AU - Varela, Maria
AU - Garcia-Barriocanal, Javier
AU - Leon, Carlos
AU - Pennycook, Stephen J.
AU - Santamaria, Jacobo
PY - 2014/6
Y1 - 2014/6
N2 - In this work we study the interfaces between the Mott insulator LaMnO 3 (LMO) and the band insulator SrTiO3 (STO) in epitaxially grown superlattices with different thickness ratios and different transport and magnetic behaviors. Using atomic resolution electron energy-loss spectral imaging, we analyze simultaneously the structural and chemical properties of these interfaces. We find changes in the oxygen octahedral tilts within the LaMnO3 layers when the thickness ratio between the manganite and the titanate layers is varied. Superlattices with thick LMO and ultrathin STO layers present unexpected octahedral tilts in the STO, along with a small amount of oxygen vacancies. On the other hand, thick STO layers exhibit undistorted octahedra while the LMO layers present reduced O octahedral distortions near the interfaces. These findings are discussed in view of the transport and magnetic differences found in previous studies.
AB - In this work we study the interfaces between the Mott insulator LaMnO 3 (LMO) and the band insulator SrTiO3 (STO) in epitaxially grown superlattices with different thickness ratios and different transport and magnetic behaviors. Using atomic resolution electron energy-loss spectral imaging, we analyze simultaneously the structural and chemical properties of these interfaces. We find changes in the oxygen octahedral tilts within the LaMnO3 layers when the thickness ratio between the manganite and the titanate layers is varied. Superlattices with thick LMO and ultrathin STO layers present unexpected octahedral tilts in the STO, along with a small amount of oxygen vacancies. On the other hand, thick STO layers exhibit undistorted octahedra while the LMO layers present reduced O octahedral distortions near the interfaces. These findings are discussed in view of the transport and magnetic differences found in previous studies.
KW - complex oxides
KW - electron energy-loss spectroscopy
KW - manganites
KW - oxygen octahedral tilts
KW - oxygen vacancies
KW - scanning transmission electron microscopy
KW - spectrum imaging
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U2 - 10.1017/S1431927614000750
DO - 10.1017/S1431927614000750
M3 - Article
AN - SCOPUS:84903767839
SN - 1431-9276
VL - 20
SP - 825
EP - 831
JO - Microscopy and Microanalysis
JF - Microscopy and Microanalysis
IS - 3
ER -