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

Journal Article · · Physical Review Letters
 [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)

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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1163166
Journal Information:
Physical Review Letters, Vol. 113, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (5)

Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology journal November 2015
Effects of interlayer and bi-quadratic exchange coupling on layered triangular lattice antiferromagnets journal January 2020
Helicity, anisotropies, and their competition in a multiferroic magnet: Insight from the phase diagram journal July 2016
Experimental evidence of symmetry breaking in the multiferroic Ba 3 NbFe 3 Si 2 O 14 using sound velocity measurements journal October 2017
Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology text January 2015

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