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Order and excitations in large-$S$ kagom\'e-lattice antiferromagnets
- Source :
- Physical Review B: Condensed Matter and Materials Physics (1998-2015), Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (14), pp.144415. ⟨10.1103/PhysRevB.92.144415⟩, Chernyshev, AL; & Zhitomirsky, ME. (2015). Order and excitations in large-S kagome-lattice antiferromagnets. Physical Review B-Condensed Matter and Materials Physics, 92(14), 144415. doi: 10.1103/PhysRevB.92.144415. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/45s6p5zc, Physical Review B, vol 92, iss 14, Physical Review B-Condensed Matter and Materials Physics, vol 92, iss 14, Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (14), pp.144415. ⟨10.1103/PhysRevB.92.144415⟩
- Publication Year :
- 2015
-
Abstract
- We systematically investigate the ground-state and the spectral properties of antiferromagnets on a kagom\'{e} lattice with several common types of the planar anisotropy: $XXZ$, single-ion, and out-of-plane Dzyaloshinskii-Moriya. Our main focus is on the role of nonlinear, anharmonic terms, which are responsible for the quantum order-by-disorder effect and for the corresponding selection of the ground-state spin structure in many of these models. The $XXZ$ and the single-ion anisotropy models exhibit a quantum phase transition between the ${\bf q}\!=\!0$ and the $\sqrt{3}\times\!\sqrt{3}$ states as a function of the anisotropy parameter, offering a rare example of the quantum order-by-disorder fluctuations favoring a ground state which is different from the one selected by thermal fluctuations. The nonlinear terms are also shown to be crucial for a very strong near-resonant decay phenomenon leading to the quasiparticle breakdown in the kagom\'{e}-lattice antiferromagnets whose spectra are featuring flat or weakly dispersive modes. The effect is shown to persist even in the limit of large spin values and should be common to other frustrated magnets with flat branches of excitations. Model calculations of the spectrum of the $S=5/2$ Fe-jarosite with Dzyaloshinskii-Moriya anisotropy provide a convincing and detailed characterization of the proposed scenario.<br />Comment: 17 pages, 13 figures, published version. Recipient of the PRB beauty award (Editors' Suggestion)
- Subjects :
- Quantum phase transition
Fluids & Plasmas
Thermal fluctuations
Spin-Liquid
02 engineering and technology
01 natural sciences
Condensed Matter - Strongly Correlated Electrons
Engineering
Spin wave
Quantum mechanics
Lattice (order)
0103 physical sciences
Disorder
010306 general physics
Anisotropy
Physics
[PHYS]Physics [physics]
Condensed matter physics
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Physical Sciences
Chemical Sciences
Condensed Matter::Strongly Correlated Electrons
cond-mat.str-el
0210 nano-technology
Subjects
Details
- Language :
- English
- ISSN :
- 10980121 and 1550235X
- Database :
- OpenAIRE
- Journal :
- Physical Review B: Condensed Matter and Materials Physics (1998-2015), Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (14), pp.144415. ⟨10.1103/PhysRevB.92.144415⟩, Chernyshev, AL; & Zhitomirsky, ME. (2015). Order and excitations in large-S kagome-lattice antiferromagnets. Physical Review B-Condensed Matter and Materials Physics, 92(14), 144415. doi: 10.1103/PhysRevB.92.144415. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/45s6p5zc, Physical Review B, vol 92, iss 14, Physical Review B-Condensed Matter and Materials Physics, vol 92, iss 14, Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (14), pp.144415. ⟨10.1103/PhysRevB.92.144415⟩
- Accession number :
- edsair.doi.dedup.....6a5ba63445bfc3eddfd99f73f3bb0422