20.500.12556/RUL-176548 Optimized flux single-crystal growth of the quantum spin liquid candidate NdTa$_7$O$_{19}$ and other rare-earth heptatantalates, ErTa$_7$O$_{19}$ and GdTa$_7$O$_{19}$ Single crystals are essential for characterizing a wide range of magnetic states, including exotic ones such as quantum spin liquids. This study reports a flux method for growing single crystals of NdTa$_7$O$_{19}$, the first quantum spin liquid candidate on a triangular spin-lattice with dominant Ising-like spin correlations. Purple NdTa$_7$O$_{19}$ single crystals with hexagonal morphology were successfully grown by using a K$_2$Mo$_3$O$_{10}$−B$_2$O$_3$ flux. With lateral sizes up to 3.5 mm and a thickness up to 2 mm, these are the largest dimensions reported to date. The chemical composition was confirmed by powder and single-crystal X-ray diffraction along with scanning electron microscopy with energy dispersive X-ray spectroscopy. Aiming for an accurate determination of the magnetic anisotropy and its effect on the magnetic properties, NdTa$_7$O$_{19}$ crystals were additionally analyzed by magnetic susceptibility, revealing a substantial anisotropy without long-range magnetic ordering down to 2 K. Single crystals of two novel rare-earth heptatantalates, ErTa$_7$O$_{19}$ and GdTa$_7$O$_{19}$, were also grown, and their magnetic properties investigated. The magnetic anisotropy of ErTa$_7$O$_{19}$ closely resembles that of isostructural NdTa$_7$O$_{19}$, indicating the possibility of a similar exotic magnetic ground state. In contrast, GdTa$_7$O$_{19}$ shows paramagnetic behavior, consistent with previous results obtained for polycrystalline samples. quantum spin liquid single-crystal growth magnetic properties flux rare-earth tantalates crystal structure crystallization crystals kvantna spinska tekočina gojenje monokristalov magnetne lastnosti talilo redkozemeljski tantalati magnetizem kristali kovine redkih zemelj true false true Angleški jezik Slovenski jezik Članek v reviji 2025-12-03 13:50:57 2025-12-03 13:51:03 2025-12-22 04:02:31 0000-00-00 00:00:00 2025 0 0 Str. 4646-4654 iss. 12 Vol. 25 Jun. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 546 1528-7505 10.1021/acs.cgd.5c00624 238455811 optimized-flux-single-crystal-growth-of-the-quantum-spin-liquid-candidate-ndta7o19-and-other-rare-earth-heptatantalates.pdf optimized-flux-single-crystal-growth-of-the-quantum-spin-liquid-candidate-ndta7o19-and-other-rare-earth-heptatantalates.pdf 1 BFAF4EF6A8CBD9AD364687C1EF6FA97D 2fa1b7c1e205e36b44d4402c66f7c535916ca30535850208338d5f45623a5f39 f638cd87-d046-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222945 https://pubs.acs.org/doi/10.1021/acs.cgd.5c00624 1 57310b7b-d046-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=222944 Fakulteta za gradbeništvo in geodezijo Fakulteta za matematiko in fiziko 0 0 0