Strong quantum effects in an almost classical antiferromagnet on a kagome lattice
Abstract
Two ubiquitous features of frustrated spin systems stand out: massive degeneracy of their ground states and flat, or dispersionless, excitation branches. In real materials, the former is frequently lifted by secondary interactions or quantum fluctuations, in favor of an ordered or spin-liquid state, but the latter often survive. In this paper, we demonstrate that flat modes may precipitate remarkably strong quantum effects even in the systems that are otherwise written off as almost entirely classical. The resultant spectral features should be reminiscent of the quasiparticle breakdown in quantum systems, only here the effect is strongly amplified by the flatness of spin-excitation branches, leading to the damping that is not vanishingly small even at S$$\gg$$1. We provide a theoretical analysis of excitation spectrum of the S=5/2 iron-jarosite to illustrate our findings and to suggest further studies of this and other frustrated spin systems.
- Authors:
-
- Univ. of California, Irvine, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1784345
- Alternate Identifier(s):
- OSTI ID: 1213962
- Grant/Contract Number:
- FG02-04ER46174; PHYS-1066293
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 9; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Chernyshev, A. L. Strong quantum effects in an almost classical antiferromagnet on a kagome lattice. United States: N. p., 2015.
Web. doi:10.1103/physrevb.92.094409.
Chernyshev, A. L. Strong quantum effects in an almost classical antiferromagnet on a kagome lattice. United States. https://doi.org/10.1103/physrevb.92.094409
Chernyshev, A. L. Fri .
"Strong quantum effects in an almost classical antiferromagnet on a kagome lattice". United States. https://doi.org/10.1103/physrevb.92.094409. https://www.osti.gov/servlets/purl/1784345.
@article{osti_1784345,
title = {Strong quantum effects in an almost classical antiferromagnet on a kagome lattice},
author = {Chernyshev, A. L.},
abstractNote = {Two ubiquitous features of frustrated spin systems stand out: massive degeneracy of their ground states and flat, or dispersionless, excitation branches. In real materials, the former is frequently lifted by secondary interactions or quantum fluctuations, in favor of an ordered or spin-liquid state, but the latter often survive. In this paper, we demonstrate that flat modes may precipitate remarkably strong quantum effects even in the systems that are otherwise written off as almost entirely classical. The resultant spectral features should be reminiscent of the quasiparticle breakdown in quantum systems, only here the effect is strongly amplified by the flatness of spin-excitation branches, leading to the damping that is not vanishingly small even at S$\gg$1. We provide a theoretical analysis of excitation spectrum of the S=5/2 iron-jarosite to illustrate our findings and to suggest further studies of this and other frustrated spin systems.},
doi = {10.1103/physrevb.92.094409},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 9,
volume = 92,
place = {United States},
year = {Fri Sep 04 00:00:00 EDT 2015},
month = {Fri Sep 04 00:00:00 EDT 2015}
}
Web of Science
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