Charge and orbital ordering and the dynamics of layered manganite films

为了通过外延应变控制电荷和轨道有序图形，在LaSrGaO4和LaSrAlO4衬底(100)表面制备了Nd0.25gt；sr1.75；MnO4薄膜。由于MnO_2面上的各向异性应变，取向控制薄膜得到了稳定。高各向异性光谱的测量表明，d&lt；3x2-r2&gt；轨道的铁性有序方向可以通过外加单轴压力来控制，这意味着与压电晶体相结合的开关器件具有潜在的潜力。

In order to control the charge and orbital ordered pattern by epitaxial strain, Nd_<0.25>Sr_<1.75>MnO_4 thin films were fabricated on the (100) surface of LaSrGaO_4 and LaSrAlO_4 substrates. Due to the anisotropic strain in the MnO_2 plane, the orientation-controlled films were stabilized. Measurements of highly anisotropic optical spectra indicate that the direction of the ferroic ordering of d_<3x2-r2> orbitals can be controlled by external uniaxial pressure, implying a potential for a switching device combined with piezoelectric crystals.