We have grown single crystals of PrMgAl11O19, 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 (κ0/T) and strong spin-phonon scattering effect, suggesting that the spin excitations are also involved. Our results further demonstrate that PrMgAl11O19 is a rare quantum spin liquid candidate with Ising-like anisotropy.
@article{arxiv.2407.11167,
title = {Ising-type quantum spin liquid state in PrMgAl$_{11}$O$_{19}$},
author = {N. Li and A. Rutherford and Y. Y. Wang and H. Liang and Q. J. Li and Z. J. Zhang and H. Wang and W. Xie and H. D. Zhou and X. F. Sun},
journal= {arXiv preprint arXiv:2407.11167},
year = {2024}
}