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Article Dans Une Revue Physical Review B Année : 2020

4f spin driven ferroelectric-ferromagnetic multiferroicity in PrMn2O5 under a magnetic field

Résumé

In contrast to all other members of the RMn2O5 family with nonzero 4 f electrons (R = Nd to Lu), PrMn2O5 does not show any spin driven ferroelectricity in the magnetically ordered phase. By means of high-field electric polarization measurements up to 45 T, we have found that this exceptional candidate undergoes a spin driven multiferroic phase under magnetic field. X-ray magnetic circular dichroism studies up to 30 T at the Pr L2 edge show that this ferroelectricity originates from and directly couples to the ferromagnetic component of the Pr3+ spins. Experimental observations along with our generalized gradient-approximation+U calculations reveal that this exotic ferroelectric-ferromagnetic combination stabilizes through the exchange-striction mechanism solely driven by a 3d-4 f -type coupling, as opposed to the other RMn2O5 members with 3d-3d driven ferroelectricantiferromagnetic- type conventional type-II multiferroicity.
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Dates et versions

hal-03022065 , version 1 (09-12-2020)

Identifiants

Citer

S. Chattopadhyay, V. Balédent, S. K. Panda, Sh. Yamamoto, F. Duc, et al.. 4f spin driven ferroelectric-ferromagnetic multiferroicity in PrMn2O5 under a magnetic field. Physical Review B, 2020, 102, pp.094408. ⟨10.1103/PhysRevB.102.094408⟩. ⟨hal-03022065⟩
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