Low-temperature magnetism of KAgF3

KAgF3 is a quasi-one-dimensional quantum antiferromagnet hosting a series of intriguing structural and magnetic transitions. Here we use powder neutron diffraction, μSR spectroscopy, and density functional theory calculations to elucidate the low-temperature magnetic phases. Below TN1=29K we find that the material orders as an A-type antiferromagnet with an ordered moment of 0.52μB. Both neutrons and muons provide evidence for an intermediate phase at temperatures TN1