  Antiferromagnetic materials can host spin-waves with polarizations ranging
from circular to linear depending on their magnetic anisotropies. Until now,
only easy-axis anisotropy antiferromagnets with circularly polarized spin-waves
were reported to carry spin-information over long distances of micrometers. In
this article, we report long-distance spin-transport in the easy-plane canted
antiferromagnetic phase of hematite and at room temperature, where the linearly
polarized magnons are not intuitively expected to carry spin. We demonstrate
that the spin-transport signal decreases continuously through the easy-axis to
easy-plane Morin transition, and persists in the easy-plane phase through
current induced pairs of linearly polarized magnons with dephasing lengths in
the micrometer range. We explain the long transport distance as a result of the
low magnetic damping, which we measure to be below 0.0001 as in the best
ferromagnets. All of this together demonstrates that long-distance transport
can be achieved across a range of anisotropies and temperatures, up to room
temperature, highlighting the promising potential of this insulating
antiferromagnet for magnon-based devices.
