We use neutron scattering to investigate the doping evolution of the magnetic correlations in the single-layer manganite Pr1−xCa1+xMnO4, away from the x=0.5 composition where the CE-type commensurate antiferromagnetic (AF) structure is stable. We find that short-range incommensurate spin correlations develop as the system is electron doped (x<0.5), which coexist with the CE-type AF order. This suggests that electron doping in this system induces an inhomogeneous electronic self-organization, where commensurate AF patches with x=0.5 are separated by electron-rich domain walls with short range magnetic correlations. This behavior is strikingly different than for the perovksite Pr1−xCaxMnO3, where the long-range CE-type commensurate AF structure is stable over a wide range of electron or hole doping around x=0.5.
@article{arxiv.0909.1944,
title = {Electronic self-organization in the single-layer manganite $\rm Pr_{\it 1-x}Ca_{\it 1+x}MnO_4$},
author = {F. Ye and Songxue Chi and J. A. Fernandez-Baca and A. Moreo and E. Dagotto and J. W. Lynn and R. Mathieu and Y. Kaneko and Y. Tokura and Pengcheng Dai},
journal= {arXiv preprint arXiv:0909.1944},
year = {2009}
}