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Multiferroic phase diagram of E -type RMnO3 films studied by neutron and x-ray diffraction

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Mukherjee Saumya, Shimamoto Kenta, Windsor Yoav William, Ramakrishnan Mahesh, Parchenko Sergii, Staub Urs, Chapon Laurent, Ouladdiaf Bachir, Medarde Marisa, Shang Tian, Müller Elisabeth A., Kenzelmann Michel, Lippert Thomas, Schneider Christof W., Niedermayer Christof,
Project Structural and magneto-electric properties of strained REMnO3 films
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 98(17)
Page(s) 174416 - 174416
Title of proceedings Physical Review B
DOI 10.1103/physrevb.98.174416

Abstract

We present a generalized multiferroic phase diagram for orthorhombic RMnO3 (R = Gd-Lu) based on coherently grown thin films. The magnetic order was identified by neutron-diffraction and resonant soft x-ray scattering experiments. For large R-ions (R = Gd-Dy), the transition temperature to a long-range ordered antiferromagnetic phase is only weakly dependent on the R-ion radius, but decreases monotonically with decreasing R-ion radius for films with R = Ho-Lu. The antiferromagnetic phase is characterized by an incommensurate order of the Mn3+ spins, which successively locks into a commensurate E-type state. These findings confirm a uniform multiferroic ground state independent of the R ion and are in excellent agreement with predicted properties of strain-induced multiferroicity in these materials. In particular, strong variation of multiferroic properties in these epitaxial films compared to bulk highlights the tuning ability of strain.
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