Dominant Kitaev Interaction and Field-Induced Quantum Phase Transitions in Triangular-Lattice KCeSe_{2}

Mingtai Xie, Zheng Zhang, Weizhen Zhuo, Wei Xu, Jinfeng Zhu, Jan Embs, Lei Wang, Zikang Li, Huanpeng Bu,Anmin Zhang,Feng Jin,Jianting Ji,Zhongwen Ouyang,Liusuo Wu,Jie Ma,Qingming Zhang

Physical Review Research（2025）

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Abstract

Realizing Kitaev interactions on triangular lattices offers a compelling platform for exploring quantum-spin-liquid physics beyond the conventional honeycomb lattice framework. Here, we investigate the triangular-lattice antiferromagnet KCeSe2, where multiple probes reveal strong magnetic anisotropy suggesting significant Kitaev physics. Through detailed and combined analysis of magnetization, neutron scattering, and thermodynamic experiments, we identify dominant ferromagnetic Kitaev (K = -1.82 K) and antiferromagnetic Heisenberg (J = 1.34 K) interactions that stabilize a stripe-yz ordered ground state via an order-by-disorder mechanism. Magnetic fields applied along the Kitaev bond direction induce two phase transitions at 1.67 T and 3.8 T, consistent with density matrix renormalization group (DMRG) calculations predictions of a progression from stripe-yz to stripe-canted and spin-polarized phases. Near the 1.67 T quantum critical point, enhanced quantum fluctuations suggest conditions favorable for exotic excitations. These results establish KCeSe2 as a platform for exploring Kitaev physics on triangular lattices.

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【要点】：本文研究了三角晶格反铁磁材料KCeSe2，揭示了其中的Kitaev相互作用和磁场引起的量子相变，为探索量子自旋液体物理学提供了新的平台。

【方法】：通过磁化、中子散射和热力学实验的详细分析，结合多种探测手段揭示了材料中的磁各向异性和Kitaev物理。

【实验】：在KCeSe2材料中，通过磁场沿Kitaev键方向的应用，观察到在1.67 T和3.8 T的两个量子相变点，与密度矩阵重整化群（DMRG）计算结果一致，表明从条纹-yz相到条纹-倾斜相和自旋极化相的转变，并在接近1.67 T的量子临界点处观测到增强的量子涨落。实验使用的数据集名称未在摘要中明确提及。

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