The temperature dependence of charge order in Fe2OBO3 was investigated by resistivity and differential scanning calorimetry measurements, Mossbauer spectroscopy, and synchrotron x-ray scattering, revealing an intermediate phase between room temperature and 340 K, characterized by coexisting mobile and immobile carriers, and by incommensurate superstructure modulations with temperature-dependent propagation vector (1/2,0,tau). The incommensurate modulations arise from specific anti-phase boundaries with low energy cost due to geometrical charge frustration.
@article{arxiv.0707.3127,
title = {Incommensurate Charge Order Phase in Fe2OBO3 due to Geometrical Frustration},
author = {M. Angst and R. P. Hermann and W. Schweika and J. -W. Kim and P. Khalifah and H. J. Xiang and M. -H. Whangbo and D. -H. Kim and B. C. Sales and D. Mandrus},
journal= {arXiv preprint arXiv:0707.3127},
year = {2007}
}
Comments
4 p., 5 fig.; v2: slightly expanded introduction + minor changes. PRL in print