Control of orbital ordered state in strained Nd0.25Sr1.75MnO4 films

Takahashi, K. S.; Fujioka, J.; Ida, Y.; Kawasaki, M.; Tokura, Y.
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p202508
Academic Journal
Epitaxial strain effect has been studied for Nd0.25Sr1.75MnO4 thin films on (100) surfaces of two different isostructural (single-layered perovskite) substrates, LaSrAlO4 and LaSrGaO4. Due to the anisotropic strain in the MnO2 plane, the orientation-controlled films were stabilized with the structure consistent with that of C-type antiferromagnetic and d3x2-r2 ferro-orbital-ordered state. Measurements of highly anisotropic optical spectra show that the tensile strain in the MnO2 plane aligns ferroically the direction of d3x2-r2 orbitals parallel to the film plane, whereas compressive strain does those vertical to the film plane. These results indicate that the direction of the ferroic ordering of d3x2-r2 orbitals can be controlled by external uniaxial pressure, implying a potential for a switching device.


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