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Title: Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet

Magnetic field (B) variation of the electrical polarization P c ( ∥c) of the perfect triangular lattice antiferromagnet RbFe(MoO 4) 2 is examined up to the saturation point of the magnetization for B⊥c. P c is observed only in phases for which chirality is predicted in the in-plane magnetic structures. No strong anomaly is observed in P c at the field at which the spin modulation along the c axis, and hence the spin helicity, exhibits a discontinuity to the commensurate state. These results indicate that the ferroelectricity in this compound originates predominantly from the spin chirality, the explanation of which would require a new mechanism for magnetoferroelectricity. Lastly, the obtained field-temperature phase diagrams of ferroelectricity well agree with those theoretically predicted for the spin chirality of a Heisenberg spin triangular lattice antiferromagnet.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [1] ;  [4] ;  [1] ;  [2] ;  [2] ;  [5] ;  [1]
  1. Univ. of Tokyo (Japan)
  2. Yokohama National University, Yokohama (Japan)
  3. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  4. Univ. of Tokyo (Japan); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1163166

Mitamura, H., Watanuki, R., Kaneko, Koji, Onozaki, N., Amou, Y., Kittaka, S., Kobayashi, Riki, Shimura, Y., Yamamoto, I., Suzuki, K., Chi, Songxue, and Sakakibara, T.. Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet. United States: N. p., Web. doi:10.1103/PhysRevLett.113.147202.
Mitamura, H., Watanuki, R., Kaneko, Koji, Onozaki, N., Amou, Y., Kittaka, S., Kobayashi, Riki, Shimura, Y., Yamamoto, I., Suzuki, K., Chi, Songxue, & Sakakibara, T.. Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet. United States. doi:10.1103/PhysRevLett.113.147202.
Mitamura, H., Watanuki, R., Kaneko, Koji, Onozaki, N., Amou, Y., Kittaka, S., Kobayashi, Riki, Shimura, Y., Yamamoto, I., Suzuki, K., Chi, Songxue, and Sakakibara, T.. 2014. "Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet". United States. doi:10.1103/PhysRevLett.113.147202. https://www.osti.gov/servlets/purl/1163166.
@article{osti_1163166,
title = {Spin-Chirality-Driven Ferroelectricity on a Perfect Triangular Lattice Antiferromagnet},
author = {Mitamura, H. and Watanuki, R. and Kaneko, Koji and Onozaki, N. and Amou, Y. and Kittaka, S. and Kobayashi, Riki and Shimura, Y. and Yamamoto, I. and Suzuki, K. and Chi, Songxue and Sakakibara, T.},
abstractNote = {Magnetic field (B) variation of the electrical polarization Pc ( ∥c) of the perfect triangular lattice antiferromagnet RbFe(MoO4)2 is examined up to the saturation point of the magnetization for B⊥c. Pc is observed only in phases for which chirality is predicted in the in-plane magnetic structures. No strong anomaly is observed in Pc at the field at which the spin modulation along the c axis, and hence the spin helicity, exhibits a discontinuity to the commensurate state. These results indicate that the ferroelectricity in this compound originates predominantly from the spin chirality, the explanation of which would require a new mechanism for magnetoferroelectricity. Lastly, the obtained field-temperature phase diagrams of ferroelectricity well agree with those theoretically predicted for the spin chirality of a Heisenberg spin triangular lattice antiferromagnet.},
doi = {10.1103/PhysRevLett.113.147202},
journal = {Physical Review Letters},
number = 14,
volume = 113,
place = {United States},
year = {2014},
month = {10}
}