We herein report on a fast and convenient soft-chemical synthesis approach towards large 1T-CrTe₂ van-der-Waals crystals. This compound is formed X-ray diffraction pure, with a complete conversion within just over 2 h from flux-grown LiCrTe₂ crystals using diluted acids. Due to the availability of high-quality single crystals, we have confirmed the crystal structure for the first time by single-crystal X-ray diffraction experiments. For the acid deintercalated 1T-CrTe₂ crystals, we find long-range ferromagnetic order with a Curie temperature of T_C = 318 K. We further revealed the magnetic structure of 1T-CrTe₂ using low-temperature neutron powder diffraction experiments and determined the magnetic Hamiltonian using density functional theory. X-ray diffraction experiments of post-annealed crystals suggest a thermal stability of 1T-CrTe₂ up to at least 100 °C. Our findings expand the synthesis methods for 1T-CrTe₂ crystals, which hold promise for integrated room-temperature spintronics applications.

中文翻译：

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室温铁磁体 1T-CrTe2 范德华大晶体的高效软化学合成


我们在此报告了一种针对大 1T-CrTe₂ 范德华晶体的快速便捷的软化学合成方法。这种化合物是纯 X 射线衍射形成的，使用稀酸在 2 个多小时内从助焊剂生长的 LiCrTe₂ 晶体完全转化。由于高质量单晶的可用性，我们通过单晶 X 射线衍射实验首次证实了晶体结构。对于酸脱嵌的 1T-CrTe₂ 晶体，我们发现居里温度为 T_C = 318 K 的长程铁磁有序。我们利用低温中子粉末衍射实验进一步揭示了 1T-CrTe₂ 的磁性结构，并使用密度泛函理论确定了磁性哈密顿量。后退火晶体的 X 射线衍射实验表明，1T-CrTe₂ 在至少 100 °C 的温度下具有热稳定性。 我们的发现扩展了 1T-CrTe₂ 晶体的合成方法，这为集成室温自旋电子学应用带来了希望。