The electron doped manganite system, Bi0.125Ca0.875MnO3, exhibits large bulk magnetization of unknown origin. To select amongst possible magnetic ordering models, we have conducted temperature and magnetic field dependent small-angle neutron scattering measurements. Nontrivial spin structure has been revealed. Ferromagnetic spin clusters form in the antiferromagnetic background when temperature is decreased to Tc~108K. With a further reduction in temperature or the application of external magnetic field, the clusters begin to form in larger numbers, which gives an overall enhancement of magnetization below Tc.
@article{arxiv.0708.2300,
title = {Observation of Ferromagnetic Clusters in Bi0.125Ca0.875MnO3},
author = {Yuhai Qin and Trevor A. Tyson and Klaus Pranzas and Helmut Eckerlebe},
journal= {arXiv preprint arXiv:0708.2300},
year = {2009}
}