Eder Felix, Witteveen Catherine, Giannini Enrico, von Rohr Fabian O
Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland.
Department of Physics, University of Zurich, 190 Winterthurerstr, CH-8057 Zurich, Switzerland.
J Am Chem Soc. 2025 Feb 12;147(6):4896-4903. doi: 10.1021/jacs.4c13545. Epub 2025 Jan 30.
Layered delafossite-type compounds and related transition metal dichalcogenides, characterized by their triangular net structures, serve as prototypical systems for exploring the intricate interplay between crystal structure and magnetic behavior. Herein, we report on the discovery of the compound KCrSe ( ≈ 0.13), an incommensurately modulated phase. Single crystals of this compound were grown for the first time using a K/Se self-flux. We find a monoclinic crystal structure with incommensurate modulation that can be rationalized by a 3 + 1-dimensional model. This modulation compensates for the under-stoichiometry of K cations, creating pronounced undulations in the CrSe layers. Our anisotropic magnetization measurements reveal that KCrSe undergoes a transition to a long-range magnetically ordered state below = 133 K, a temperature 1.6 to 3.3 times higher than in earlier reported KCrSe compounds. Our findings open new avenues for tuning the magnetic properties of these layered materials through structural modulation.
层状铜铁矿型化合物及相关过渡金属二硫属化物，以其三角网状结构为特征，是探索晶体结构与磁行为之间复杂相互作用的典型体系。在此，我们报告化合物KCrSe（≈0.13）的发现，这是一种非公度调制相。首次使用K/Se自熔剂生长出该化合物的单晶。我们发现其具有非公度调制的单斜晶体结构，可用3 + 1维模型进行合理解释。这种调制补偿了K阳离子的化学计量不足，在CrSe层中产生明显的起伏。我们的各向异性磁化测量表明，KCrSe在低于 = 133 K时转变为长程磁有序状态，该温度比早期报道的KCrSe化合物高1.6至3.3倍。我们的发现为通过结构调制调整这些层状材料的磁性能开辟了新途径。
