Abstract
We report the study of magnetic and orbital order in epitaxial thin films grown on –. Resonant soft x-ray scattering revealed significant modifications of the magnetic order in the film as compared to the bulk. Namely (i) a different magnetic ordering wave vector, (ii) different spin directions and (iii) an additional magnetic reordering transition. We demonstrate that an analysis of the resonant scattering which is based solely on local symmetries and which does not involve a modeling of energy-dependent lineshapes allows to extract this detailed microscopic information. This approach significantly simplifies the analysis and interpretation of resonant scattering data.
Highlights
Hole-doped perovskite manganites R1−xAxMnO3, where R is a rare-earth (R = La, Nd, Pr) and A is an alkaline-earth atom (A = Sr, Ba, Ca) have attracted much attention because they exhibit remarkable physical properties such as colossal magnetoresistance and complex electronic ordering phenomena [1,2,3,4,5,6,7,8]
In a new experimental approach, the polarization and energy dependence of resonant soft x-ray scattering are used to reveal significant modifications of the magnetic order in the film as compared to the bulk, namely (i) a different magnetic ordering wave vector, (ii) a different magnetic easy axis and (iii) an additional magnetic reordering transition at low temperatures. These observations indicate a strong impact of the epitaxial strain on the spin order, which is mediated by the orbital degrees of freedom and which provides a promising route to tune the magnetic properties of manganite films
It was recently shown that epitaxial strain effects can control charge ordering (CO) in thin films of Mn-oxides [12, 13]
Summary
We report the study of magnetic and orbital order in Pr0.5Ca0.5MnO3 epitaxial thin films grown on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) (011)c. These observations indicate a strong impact of the epitaxial strain on the spin order, which is mediated by the orbital degrees of freedom and which provides a promising route to tune the magnetic properties of manganite films. We present a resonant soft x-ray scattering (RSXS) study of the electronic order in Pr0.5Ca0.5MnO3 thin films grown epitaxially on LSAT (011), which implies that the microscopic magnetic order in films can differ significantly from that of the corresponding bulk materials.
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