Electronic ground-state hysteresis under magnetic field in GdMn$_2$O$_5$

In this paper, we investigate the physical properties of the type II multiferroic GdMn $_{2}$ O $_{5}$ 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 $ $b d i r e c t i o n s, a s a u t h o r i z e d b y s y m m e t r y, b u t n e v e r o b s e r v e d e x p e r i m e n t a l l y u p t o n o w . W h i l e t h e m a g n e t i c p r o p e r t i e s r e c o v e r t h e i r i n i t i a l s t a t e s a f t e r d r i v i n g t h e f i e l d b a c k t o z e r o, t h e p o l a r i z a t i o n a l o n g$ 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.

Electronic ground-state hysteresis under magnetic field in GdMn $_{2}$ O $_{5}$

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Electronic ground-state hysteresis under magnetic field in GdMn $_{2}$ O $_{5}$

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Electronic ground-state hysteresis under magnetic field in GdMn22​O55​

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Electronic ground-state hysteresis under magnetic field in GdMn22​O55​

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Electronic ground-state hysteresis under magnetic field in GdMn $_{2}$ O $_{5}$

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Electronic ground-state hysteresis under magnetic field in GdMn $_{2}$ O $_{5}$

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