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arXiv · 2407.11167

Ising-type quantum spin liquid state in PrMgAl$_{11}$O$_{19}$

N. Li·A. Rutherford·Y. Y. Wang·H. Liang·Q. J. Li·Z. J. Zhang·H. Wang·W. Xie·H. D. Zhou·X. F. Sun
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Abstract

We have grown single crystals of PrMgAl$_{11}$O$_{19}$, an ideal triangular-lattice antiferromagnet, and performed magnetic susceptibility, specific heat and thermal conductivity measurements at low temperatures. The main results are as follows: (i) The temperature-dependent susceptibility shows a negligible in-plane response and the isothermal magnetization curves confirm the easy axis along the $c$ axis. (ii) The specific heat measurements reveal the absence of long-range magnetic order down to 60 mK, and the power-law temperature dependence indicates the existence of the gapless magnetic excitations in system. (iii) The ultralow-temperature thermal conductivity exhibits negligibly small residual term ($\kappa_0/T$) and strong spin-phonon scattering effect, suggesting that the spin excitations are also involved. Our results further demonstrate that PrMgAl$_{11}$O$_{19}$ is a rare quantum spin liquid candidate with Ising-like anisotropy.

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N. Li, A. Rutherford, Y. Y. Wang, H. Liang, Q. J. Li, Z. J. Zhang, H. Wang, W. Xie, H. D. Zhou, X. F. Sun. 2024-07-15. Ising-type quantum spin liquid state in PrMgAl$_{11}$O$_{19}$. https://doi.org/10.1103/physrevb.110.134401

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