In this paper, we investigate the physical properties of the type II multiferroic GdMn2O5 material by means of neutrons scattering, electric polarization and magnetization measurements. A complex (T,H) phase diagram shows up, with especially a field induced magnetic transition around 12 T at low temperature. The high field phase is accompanied by an additional electric polarization along both the a and b directions, as authorized by symmetry, but never observed experimentally up to now. While the magnetic properties recover their initial states after driving the field back to zero, the polarization along a shows a significant increase. This behavior is observed for all directions of the magnetic field. It constitutes a novel and striking manifestation of the magneto-electric coupling, resulting in the establishment of a new ground state at zero magnetic field.
@article{arxiv.2307.06247,
title = {Electronic ground-state hysteresis under magnetic field in GdMn$_2$O$_5$},
author = {Balédent V and Vaunat A. and Petit S. and L. Nataf and Chattopadhyay S. and Raymond S. and Foury-Leylekian P},
journal= {arXiv preprint arXiv:2307.06247},
year = {2023}
}