Journal Article

PUBDB-2021-00514

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png $4f$ spin driven ferroelectric-ferromagnetic multiferroicity in PrMn$_2$O$_ 5$ under a magnetic field

Chattopadhyay, B. (Corresponding author)Extern* ; Balédent, V. ; Panda, S. K. ; Yamamoto, S. ; Duc, F. ; Herrmannsdörfer, T. ; Uhlarz, M. ; Gottschall, T. ; Mathon, O. ; Wang, Z. ; Strohm, C.DESY* ; Greenblatt, M. ; Foury-Leylekian, P. ; Wosnitza, J.

2020
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevB.102.094408  doi:10.3204/PUBDB-2021-00514

Abstract: In contrast to all other members of the $RMn_2O_5$ family with nonzero $4f$ electrons (R = Nd to Lu), $PrMn_2O_5$ 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 $L_2$ edge show that this ferroelectricity originates from and directly couples to the ferromagnetic component of the $Pr^{3+}$ 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 $3d−4f$-type coupling, as opposed to the other $RMn_2O_5$ members with $3d−3d$ driven ferroelectric-antiferromagnetic-type conventional type-II multiferroicity.

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Contributing Institute(s):

1. FS-Photon Science (FS-PS)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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