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arXiv · 2503.00752

Possible quantum spin liquid state of CeTa$_7$O$_{19}$

N. Li·A. Rutherford·Y. Y. Wang·H. Liang·Y. Zhou·Y. Sun·D. D. Wu·P. F. Chen·Q. J. Li·H. Wang·W. Xie·E. S. Choi·S. Z. Zhang·M. Lee·H. D. Zhou·X. F. Sun
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Abstract

CeTa$_7$O$_{19}$ is a recently found two-dimensional triangular lattice antiferromagnet without showing magnetic order. We grew high-quality CeTa$_7$O$_{19}$ single crystals and studied the low-temperature magnetic susceptibility, specific heat and thermal conductivity. The dc magnetic susceptibility and magnetization reveal its nature of effective spin-1/2, easy axis anisotropy, and antiferromagnetic spin coupling. The ultralow-temperature ac susceptibility and specific heat data indicate the absence of any phase transition down to 20 mK. The ultralow-temperature thermal conductivity ($\kappa$) at zero magnetic field exhibits a non-zero residual term $\kappa_0/T =$ 0.0056 W/K$^2$m. Although the magnetic field dependence of $\kappa$ is rather weak, the 14 T thermal conductivity shows an essential zero residual term. All these results point to a possible ground state of quantum spin liquid.

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N. Li, A. Rutherford, Y. Y. Wang, H. Liang, Y. Zhou, Y. Sun, D. D. Wu, P. F. Chen, Q. J. Li, H. Wang, W. Xie, E. S. Choi, S. Z. Zhang, M. Lee, H. D. Zhou, X. F. Sun. 2025-03-02. Possible quantum spin liquid state of CeTa$_7$O$_{19}$. https://arxiv.org/abs/2503.00752

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