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Strong quantum effects in an almost classical antiferromagnet on a kagome lattice
- Source :
- Physical Review B-Condensed Matter and Materials Physics, vol 92, iss 9, Physical Review B, vol 92, iss 9, Chernyshev, AL. (2015). Strong quantum effects in an almost classical antiferromagnet on a kagome lattice. Physical Review B-Condensed Matter and Materials Physics, 92(9), 094409. doi: 10.1103/PhysRevB.92.094409. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1d10p1c3
- Publication Year :
- 2015
- Publisher :
- eScholarship, University of California, 2015.
-
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. 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.<br />Comment: 7 pages, accepted to PRB
- Subjects :
- Physics
Strongly Correlated Electrons (cond-mat.str-el)
Condensed matter physics
Fluids & Plasmas
FOS: Physical sciences
Condensed Matter Physics
01 natural sciences
010305 fluids & plasmas
Electronic, Optical and Magnetic Materials
Condensed Matter - Strongly Correlated Electrons
Engineering
Spin wave
Quantum mechanics
Lattice (order)
0103 physical sciences
Physical Sciences
Chemical Sciences
Quasiparticle
Antiferromagnetism
Condensed Matter::Strongly Correlated Electrons
cond-mat.str-el
010306 general physics
Quantum
Excitation
Quantum fluctuation
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Physical Review B-Condensed Matter and Materials Physics, vol 92, iss 9, Physical Review B, vol 92, iss 9, Chernyshev, AL. (2015). Strong quantum effects in an almost classical antiferromagnet on a kagome lattice. Physical Review B-Condensed Matter and Materials Physics, 92(9), 094409. doi: 10.1103/PhysRevB.92.094409. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/1d10p1c3
- Accession number :
- edsair.doi.dedup.....caa2947e38eb518799f95d26b9547942