Low temperature magnetism of KAgF3

Abstract

KAgF${}_3$ is a quasi one-dimensional quantum antiferromagnet hosting a series of intriguing structural and magnetic transitions. Here we use powder neutron diffraction, $\mu$SR spectroscopy, and Density Functional Theory calculations to elucidate the low temperature magnetic phases. Below $T_{N1}=29$K we find that the material orders as an A-type antiferromagnet with an ordered moment of 0.47${\mu }_{\mathrm{B}}$. Both neutrons and muons provide evidence for an intermediate phase at temperatures $T_{N1}<T<T_{N2}$ with $T_{N2}\approx 66$ K from a previous magnetometry study. However, the evidence is at the limit of detection and its nature remains an open problem.

11 pages, 8 figures. Supplementary information is included in a separate file

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• Evaluating covalency using RIXS spectral weights: Silver fluorides vs. cuprates
• The initial stages of silver fluorination: a scanning tunneling microscopy investigation