The disordered antiferromagnet \pfn (\pfns) is investigated in a wide temperature range by combining M\"ossbauer spectroscopy and neutron diffraction experiments. It is demonstrated that the magnetic ground state is a {\it microscopic} coexistence of antiferromagnetic and a spin-glass orders. This speromagnet-like phase features frozen-in short-range fluctuations of the Fe3+ magnetic moments that are transverse to the long-range ordered antiferromagnetic spin component.
@article{arxiv.1211.4203,
title = {Microscopic Coexistence of Antiferromagnetic and Spin-Glass States},
author = {S. Chillal and M. Thede and F. J. Litterst and S. N. Gvasaliya and T. A. Shaplygina and S. G. Lushnikov and A. Zheludev},
journal= {arXiv preprint arXiv:1211.4203},
year = {2013}
}