Abstract
We present a detailed Li- and P-NMR study on single crystalline LiMnPO in the paramagnetic and antiferromagnetic phase (AFM, K). This allows us to determine the spin directions in the field-induced spin-flop phase. In addition, the anisotropic dipolar hyperfine coupling tensor of the Li and P nuclei is also fully determined by orientation and temperature-dependent NMR experiments and compared to the calculated values from crystal structure data. Deviations of the experimental values from the theoretical ones are discussed in terms of Mn disorder which is induced by Li disorder. In fact, the disorder in the Mn sublattice is directly revealed by diffuse x-ray scattering data. The present results provide experimental evidence for the Li diffusion strongly coupling to structural distortions within the MnPO host, which is expected to significantly affect the Li mobility as well as the performance of batteries based on this material.
2 More- Received 23 April 2013
DOI:https://doi.org/10.1103/PhysRevB.88.054303
©2013 American Physical Society