Open AccessPhase Diagram of a Geometrically Frustrated Triangular-Lattice Antiferromagnet in a Magnetic Field
Author(s) -
R. S. Fishman
Publication year - 2011
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.106.037206
Subject(s) - condensed matter physics , antiferromagnetism , phase diagram , hexagonal lattice , multiferroics , physics , ferroelectricity , lattice (music) , anisotropy , frustration , phase (matter) , quantum mechanics , dielectric , acoustics
The magnetic phase diagram of a geometrically frustrated triangular-lattice antiferromagnet is evaluated as a function of magnetic field and anisotropy using a trial spin state built from harmonics of a fundamental ordering wave vector. A noncollinear incommensurate state, observed to be chiral and ferroelectric in CuFeO2, appears above a collinear state with 4 sublattices (SLs). The apparent absence of multiferroic behavior for predicted chiral, noncollinear 5-SL states poses a challenge to theories of the ferroelectric coupling in CuFeO2.
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