Scaling Behavior and Spin Fluctuations in BCAO Revealed by Thermal Transport

Ever since the proposal of Kitaev model to realize quantum spin liquid, there have been many promising candidates. BaCo2(AsO4)2 is one of the materials in the latest generations. Since its magnetic ordering can be suppressed by a critical field as low as 0.5T, it's believed to possess a Kitaev term that's prominent among the physics at play. By probing with thermal transport techniques, we are able to extract information about its underlying spin interactions. In particular, we observed an intriguing scaling behavior of its highly field-sensitive thermal conductivity. The measurements also show magnetocaloric effect in Kxx and hysteresis in Kxy, which reveal further details about its rich phase diagram.