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Title: Phases of a Triangular-Lattice Antiferromagnet Near Saturation

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1180432
Grant/Contract Number:
FG02-ER46900
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Starykh, Oleg A., Jin, Wen, and Chubukov, Andrey V. Phases of a Triangular-Lattice Antiferromagnet Near Saturation. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.113.087204.
Starykh, Oleg A., Jin, Wen, & Chubukov, Andrey V. Phases of a Triangular-Lattice Antiferromagnet Near Saturation. United States. doi:10.1103/PhysRevLett.113.087204.
Starykh, Oleg A., Jin, Wen, and Chubukov, Andrey V. Thu . "Phases of a Triangular-Lattice Antiferromagnet Near Saturation". United States. doi:10.1103/PhysRevLett.113.087204.
@article{osti_1180432,
title = {Phases of a Triangular-Lattice Antiferromagnet Near Saturation},
author = {Starykh, Oleg A. and Jin, Wen and Chubukov, Andrey V.},
abstractNote = {},
doi = {10.1103/PhysRevLett.113.087204},
journal = {Physical Review Letters},
number = 8,
volume = 113,
place = {United States},
year = {Thu Aug 21 00:00:00 EDT 2014},
month = {Thu Aug 21 00:00:00 EDT 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevLett.113.087204

Citation Metrics:
Cited by: 18works
Citation information provided by
Web of Science

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  • This paper examines the relation between the spin-wave instabilities of collinear magnetic phases and the resulting non-collinear phases for a geometrically-frustrated triangular-lattice antiferromag- net in the high spin limit. Using a combination of phenomenological and Monte-Carlo techniques, we demonstrate that the instability wave-vector with the strongest intensity in the collinear phase determines the wave-vector of a cycloid or the dominant elastic peak of a more complex non-collinear phase. Our results are related to the observed multi-ferroic phase of Al-doped CuFeO2.
  • We obtain the noncollinear ground states of a triangular-lattice antiferromagnet with exchange interactions up to third nearest neighbors as a function of the single-ion anisotropy D. At a critical value of D, the collinear phase transforms into a complex noncollinear phase with odd-order harmonics of the fundamental ordering wavevector Q. The observed elastic peaks at 2 x Q in both Al- and Ga-doped CuFeO2 are explained by a scalene distortion of the triangular-lattice produced by the repulsion of neighboring oxygen atoms.
  • Cited by 2
  • We use high-resolution synchrotron x-ray and neutron diffraction to study the geometrically frustrated triangular lattice antiferromagnet CuFeO{sub 2}. On cooling from room temperature, CuFeO{sub 2} undergoes two antiferromagnetic phase transitions with incommensurate and commensurate magnetic order at T{sub N1} = 14 K and T{sub N2} = 11 K, respectively. The occurrence of these two magnetic transitions is accompanied by second- and first-order structural phase transitions from hexagonal to monoclinic symmetry. Application of a 6.9 T magnetic field lowers both transition temperatures by {approx}1 K, and induces an additional incommensurate structural modulation in the temperature region where the field-driven ferroelectricity occurs.more » These results suggest that a strong magneto-elastic coupling is intimately related to the multiferroic effect.« less
  • Ag{sub 2}CrO{sub 2} is an S = 3/2 frustrated triangular lattice antiferromagnet without an orbital degree of freedom. With decreasing temperature, a four-sublattice spin state develops. However, a long-range partially disordered state with five sublattices abruptly appears at T{sub N} = 24 K, accompanied by a structural distortion, and persists at least down to 2 K. The spin-lattice coupling stabilizes the anomalous state, which is expected to appear only in limited ranges of further-neighbor interactions and temperature. It was found that the spin-lattice coupling is a common feature in triangular lattice antiferromagnets with multiple-sublattice spin states, since the triangular latticemore » is elastic.« less