title: Classical Spin Liquid on the Maximally Frustrated Honeycomb Lattice.
abstract: 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.
authors: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors: J
authors: J
authors: Rehn
authors: Department of Theoretical Physics, Indian Association for the Cultivation of Science, Kolkata 700032, India.
authors: Arnab
authors: A
authors: Sen
authors: Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India.
authors: Kedar
authors: K
authors: Damle
authors: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors: R
authors: R
authors: Moessner