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Classical Spin Liquid on the Maximally Frustrated Honeycomb Lattice

MPG-Autoren
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Rehn,  Jorge Armando
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Moessner,  Roderich
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Zitation

Rehn, J. A., Sen, A., Damle, K., & Moessner, R. (2016). Classical Spin Liquid on the Maximally Frustrated Honeycomb Lattice. Physical Review Letters, 117(16): 167201. doi:10.1103/PhysRevLett.117.167201.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002B-BC39-2
Zusammenfassung
We show that the honeycomb Heisenberg antiferromagnet with J(1)/2 = J(2) = J(3), where J(1), J(2), and J(3) are first-, second-, and third-neighbor couplings, respectively, forms a classical spin liquid with pinch-point singularities in the structure factor at the Brillouin zone corners. Upon dilution with nonmagnetic ions, fractionalized degrees of freedom carrying 1/3 of the free moment emerge. Their effective description in the limit of low temperature is that of spins randomly located on a triangular lattice, with a frustrated sublattice-sensitive interaction of long-ranged logarithmic form. The XY version of this magnet exhibits nematic thermal order by disorder. This comes with a clear experimental diagnostic in neutron scattering, which turns out to apply also to the case of the celebrated planar order by disorder of the kagome Heisenberg antiferromagnet.