Weak exchange striction between the 4f and 3d ions in the multiferroic GdMn2O5

Jieming Sheng, X. Tong, Feng Ye, J. A. Fernandez-Baca, H. Cao, N. Poudel, M. Gooch, B. Lorenz, C. W. Chu, Xueyun Wang, and S.-W. Cheong
Phys. Rev. B 99, 094429 – Published 21 March 2019

Abstract

We used single-crystal neutron diffraction to investigate the magnetic structures of the multiferroic GdMn2O5. The system undergoes a first-order incommensurate to commensurate magnetic transition below 33 K, accompanied by the appearance of electric polarization P. Upon cooling, P increases smoothly while the magnetic order shows an abrupt enhancement in intensity below 20 K owing to the large increase of the rare-earth Gd moment. The contrasting temperature evolution of the magnetic order and polarization indicates the polarization is mainly driven by the exchange striction between the magnetic Mn ions. The incommensurate phase in the intermediate temperature range has a cycloidal modulation along the c axis, with spin configuration projected in the ab plane similar to the commensurate phase. The lack of observable bulk polarization suggests the exchange striction is not the dominant mechanism for the polarization in the incommensurate phase.

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  • Received 15 November 2018

DOI:https://doi.org/10.1103/PhysRevB.99.094429

©2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jieming Sheng1,2, X. Tong3, Feng Ye2,*, J. A. Fernandez-Baca2, H. Cao2, N. Poudel4, M. Gooch4, B. Lorenz4, C. W. Chu4, Xueyun Wang5, and S.-W. Cheong5

  • 1Department of Physics, Renmin University of China, Beijing 100872, China
  • 2Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA
  • 5Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

  • *yef1@ornl.gov

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Issue

Vol. 99, Iss. 9 — 1 March 2019

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