Out-of-plane magnetic phase diagram of Kitaev quantum spin liquid candidate Na2Co2TeO6

• URL: http://arxiv.org/abs/2405.13935v3
• Date: Fri, 31 May 2024 02:56:38 GMT
• Title: Out-of-plane magnetic phase diagram of Kitaev quantum spin liquid candidate Na2Co2TeO6
• Authors: Shengzhi Zhang, Sangyun Lee, Eric Brosha, Qing Huang, Haidong Zhou, Vivien S. Zapf, Minseong Lee,
• Abstract summary: We map out the phase diagram of the honeycomb magnet Na2Co2TeO6 with Co 3d7 in out-of-plane magnetic fields. Data can be explained by an XXZ model with a single ion anisotropy and possibly small Kitaev and Gamma exchange interactions.
• Score: 5.334461349332468
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We have investigated the magnetic properties and mapped out the phase diagram of the honeycomb magnet Na2Co2TeO6 with Co 3d7 in out-of-plane magnetic fields. This material has previously been proposed to show nearest-neighbor Kitaev interactions between Co spins and maybe even Kitaev quantum spin liquid behavior in high fields. At low magnetic fields, we observe a thermal phase transition at TN = 27 K, transitioning from a paramagnetic state to a canonical ferrimagnetic state. Under the application of magnetic fields, a spin flop-like phase transition occurred before saturation of J = 1/2 between 10 K and TN. Below 10 K, a peak-dip-peak structure emerges between 10 and 17 T in the magnetic susceptibility (dM/dH) before the magnetic saturation, reminiscent of magnetic plateau behavior. The measurement of the magnetocaloric effect also shows dip-peak-dip behavior in this field range. Our data can be explained by an XXZ model with a single ion anisotropy and possibly small Kitaev and {\Gamma} exchange interactions. We also unambiguously determined the magnetization saturation field that helps constrain the energy scale of the exchange interactions

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