Jammed Spin Liquid in the Bond-Disordered Kagome Antiferromagnet.

Published on Dec 11, 2017in Physical Review Letters9.161
· DOI :10.1103/PHYSREVLETT.119.247201
Thomas Bilitewski8
Estimated H-index: 8
(MPG: Max Planck Society),
M. E. Zhitomirsky7
Estimated H-index: 7
(UGA: University of Grenoble),
Roderich Moessner73
Estimated H-index: 73
(MPG: Max Planck Society)
We study a class of disordered continuous classical spin systems including the kagome Heisenberg magnet. While each term in its local Hamiltonian can be independently minimised, we find {\it discrete} degenerate ground states whose number grows exponentially with system size. These states do not exhibit zero-energy `excitations' characteristic of highly frustrated magnets but instead are local minima of the energy landscape, albeit with an anomalously soft excitation spectrum. This represents a spin liquid version of the phenomenon of jamming familiar from granular media and structural glasses. Correlations of this jammed spin liquid, which upon increasing the disorder strength gives way to a conventional spin glass, may be algebraic (Coulomb-type) or exponential.
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