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• W1992699488 abstract "We study the effects of external magnetic field on the properties of an ordered Heisenberg antiferromagnet with the Dzyaloshinskii-Moriya (DM) interaction. Using the spin-wave theory quantum correction to the energy, on-site magnetization, and uniform magnetization are calculated as a function of the field $H$ and the DM anisotropy constant $D$. It is shown that the spin-wave excitations exhibit an unusual field evolution of the gaps. This leads to various nonanalytic dependencies of the quantum corrections on $H$ and $D$. It is also demonstrated that, quite generally, the DM interaction suppresses quantum fluctuations, thus driving the system to a more classical ground state. Most of the discussion is devoted to the spin-$S$, two-dimensional square lattice antiferromagnet, whose $S=frac{1}{2}$ case is closely realized in ${mathrm{K}}_{2}{mathrm{V}}_{3}{mathrm{O}}_{8}$ where at $H=0$ the DM anisotropy is hidden by the easy-axis anisotropy but is revealed in a finite field. The theoretical results for the field dependence of the spin-excitation gaps in this material are presented and the implications for other systems are discussed." @default.
• W1992699488 created "2016-06-24" @default.
• W1992699488 creator A5055510120 @default.
• W1992699488 date "2005-11-11" @default.
• W1992699488 modified "2023-09-23" @default.
• W1992699488 title "Effects of an external magnetic field on the gaps and quantum corrections in an ordered Heisenberg antiferromagnet with Dzyaloshinskii-Moriya anisotropy" @default.
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• W1992699488 doi "https://doi.org/10.1103/physrevb.72.174414" @default.
• W1992699488 hasPublicationYear "2005" @default.
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