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Title: Weak exchange striction between the 4 f and 3 d ions in the multiferroic GdMn 2 O 5

Abstract

We used single-crystal neutron diffraction to investigate the magnetic structures of the multiferroic GdMn 2O 5. 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.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [3];  [3];  [3];  [4];  [4]
  1. Renmin Univ. of China, Beijing (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Houston, Houston, TX (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1507860
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sheng, Jieming, Tong, Xin Tony, Ye, Feng, Fernandez-Baca, Jaime A., Cao, Huibo, Poudel, N., Gooch, Mellisa, Lorenz, Bernd, Chu, C. W., Wang, Xueyun, and Cheong, S. -W.. Weak exchange striction between the 4f and 3d ions in the multiferroic GdMn2O5. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.094429.
Sheng, Jieming, Tong, Xin Tony, Ye, Feng, Fernandez-Baca, Jaime A., Cao, Huibo, Poudel, N., Gooch, Mellisa, Lorenz, Bernd, Chu, C. W., Wang, Xueyun, & Cheong, S. -W.. Weak exchange striction between the 4f and 3d ions in the multiferroic GdMn2O5. United States. doi:10.1103/PhysRevB.99.094429.
Sheng, Jieming, Tong, Xin Tony, Ye, Feng, Fernandez-Baca, Jaime A., Cao, Huibo, Poudel, N., Gooch, Mellisa, Lorenz, Bernd, Chu, C. W., Wang, Xueyun, and Cheong, S. -W.. Thu . "Weak exchange striction between the 4f and 3d ions in the multiferroic GdMn2O5". United States. doi:10.1103/PhysRevB.99.094429.
@article{osti_1507860,
title = {Weak exchange striction between the 4f and 3d ions in the multiferroic GdMn2O5},
author = {Sheng, Jieming and Tong, Xin Tony and Ye, Feng and Fernandez-Baca, Jaime A. and Cao, Huibo and Poudel, N. and Gooch, Mellisa and Lorenz, Bernd and Chu, C. W. and Wang, Xueyun and Cheong, S. -W.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.99.094429},
journal = {Physical Review B},
number = 9,
volume = 99,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 21, 2020
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