Centro de Física Nuclear, Universidade de Lisboa, Avenida Professor Gama Pinto, 2, 1649-003, Lisboa, Portugal.
J Phys Condens Matter. 2013 Sep 25;25(38):385602. doi: 10.1088/0953-8984/25/38/385602. Epub 2013 Aug 30.
The evolution of the local Jahn-Teller distortion across the LaMnO3+Δ phase diagram was obtained using the perturbed angular correlation local probe technique. We found that upon doping, the local distortion decreases continuously with increasing doping and that no fully Jahn-Teller distorted Mn(3+)O6 octahedra are observed within the orthorhombic insulating phase. A local single-phase scenario is established for the orbital disordered orthorhombic crystallographic structure. We also show that the continuous weakening of the Jahn-Teller distortions is not limited to a single-phase environment and occurs in a similar manner within an undistorted rhombohedric matrix upon lowering the temperature.
采用受扰角关联局域探针技术研究了 LaMnO3+Δ 相图中局域 Jahn-Teller 畸变的演化。我们发现，掺杂后，局域畸变随掺杂的增加而连续减小，在正交绝缘相中未观察到完全 Jahn-Teller 畸变的 Mn(3+)O6 八面体。建立了轨道无序正交晶体结构的局域单相场景。我们还表明，Jahn-Teller 畸变的连续弱化不仅限于单相环境，而且在低温下在未畸变的三方基质中以类似的方式发生。
