Strong quantum effects in an almost classical antiferromagnet on a kagome lattice

Chernyshev, A. L.

doi:10.1103/physrevb.92.094409

Title: Strong quantum effects in an almost classical antiferromagnet on a kagome lattice

Journal Article · Fri Sep 04 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.92.094409· OSTI ID:1784345

Chernyshev, A. L. ^[1]

Univ. of California, Irvine, CA (United States)

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.

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Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-04ER46174; PHYS-1066293

OSTI ID:: 1784345

Alternate ID(s):: OSTI ID: 1213962

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 9; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Cited By (6)

Order and excitations in $large - S$ kagome-lattice antiferromagnets Chernyshev, A. L.; Zhitomirsky, M. E. Physical Review B, Vol. 92, Issue 14 https://doi.org/10.1103/physrevb.92.144415	journal	October 2015
Field-induced dynamical properties of the $XXZ$ model on a honeycomb lattice Maksimov, P. A.; Chernyshev, A. L. Physical Review B, Vol. 93, Issue 1 https://doi.org/10.1103/physrevb.93.014418	journal	January 2016
High-Field Expansion Approach to Kagome Antiferromagnets with Dzyaloshinskii-Moriya Interactions Flynn, Michael O.; Singh, Rajiv R. P. arXiv https://doi.org/10.48550/arxiv.1905.08805	text	January 2019
Spin clusters and low-energy excitations in rare earth kagome systems Hoch, M. J. R. Modern Physics Letters B, Vol. 31, Issue 01 https://doi.org/10.1142/s0217984916300106	journal	January 2017
High-field expansion approach to kagome antiferromagnets with Dzyaloshinskii-Moriya interactions Flynn, Michael O.; Singh, Rajiv R. P. Physical Review B, Vol. 100, Issue 12 https://doi.org/10.1103/physrevb.100.121108	journal	September 2019
Theory of ground states for classical Heisenberg spin systems II Schmidt, Heinz-Jürgen arXiv https://doi.org/10.48550/arxiv.1707.02859	preprint	January 2017

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