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Single-axis-dependent structural and multiferroic properties of orthorhombic RMnO3(R = Gd–Lu)

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Kenta Shimamoto, Saumya Mukherjee, Nicholas S. Bingham, Anna K. Suszka, Thomas Lippert, Christof Niedermayer, Christof W. Schneider,
Project Structural and magneto-electric properties of strained REMnO3 films
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 95(18)
Page(s) 184105-1 - 184105-9
Title of proceedings Physical Review B
DOI 10.1103/physrevb.95.184105

Abstract

Controlling material properties by modulating the crystalline structure has been attempted using various techniques, e.g., hydrostatic pressure, chemical pressure, and epitaxy. These techniques succeed to improve properties and achieve desired functionalities by changing the unit cell in all dimensions. In order to obtain a more detailed understanding on the relation between the crystal lattice and material properties, it is desirable to investigate the influence of a smaller number of parameters. Here, we utilize the combination of chemical pressure and epitaxy to modify a single lattice parameter of the multiferroic orthorhombic RMnO3 (R = rare-earth; o-RMnO3) system. By growing a series of o-RMnO3 (R = Gd–Lu) films coherently on (010)-oriented YAlO3 substrates, the influence of chemical pressure is reflected only along the b axis. Thus a series of o-RMnO3 with a ∼ 5.18 °A, 5.77 °A < b < 5.98 ° A, and c ∼ 7.37 °A were obtained. Raman spectra analysis reveals that the change of the b-axis parameter induces a shift of the oxygen in the nominally “fixed” ca plane. Their ferroelectric ground state is independent on the b-axis parameter showing polarization of ∼1μCcm−2 along the a axis for the above-mentioned range, except for b ∼ 5.94A° , which corresponds to TbMnO3 showing ∼2μC cm−2. This result implies that multiferroic order of o-RMnO3 is almost robust against the b-axis parameter provided that the dimension of the ca plane is fixed to 7.37 °A × 5.18A° .
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