标题： 低温熵和几何受挫磁体中的可能状态 显示英文标题

标题： Low-temperature entropies and possible states in geometrically frustrated magnets

摘要： 绝缘磁性材料在冷却时释放的熵可以揭示该材料自旋态特性的相关信息。 在许多几何阻挫（GF）磁性化合物中，比热容在低温下出现一个峰，该峰来源于与同一GF晶格上经典模型（如伊辛模型）的基态连续相连的自旋态，这体现在与该比热容峰相关的熵量上。 在这项工作中，我们数值模拟了高自旋三角晶格层状系统以及SCGO晶格上的材料所释放的熵值。 我们还将几种强几何阻挫化合物中实验测得的熵值，$NiGa_2S_4$，$FeAl_2Se_4$和SCGO/BSZCGO，与可能从那些材料的量子态可能连接的经典模型推导出的理论值进行了比较。 这种比较表明，高自旋层状三角晶格化合物的最低能量态可以用单个磁性位点上的双重态来描述。 我们的分析展示了熵值如何揭示GF化合物中低能磁态的结构，并呼吁对GF磁性材料进行更精确的热力学测量。 显示英文摘要

摘要： The entropy that an insulating magnetic material releases upon cooling can reveal important information about the properties of spin states in that material. In many geometrically frustrated (GF) magnetic compounds, the heat capacity exhibits a low-temperature peak that comes from the spin states continuously connected to the ground states of classical models, such as the Ising model, on the same GF lattice, which manifests in the amount of entropy associated with this heat-capacity peak. In this work, we simulate numerically the values of entropy released by higher-spin triangular-lattice layered systems and materials on SCGO lattices. We also compare the experimentally measured values of entropy in several strongly GF compounds, $NiGa_2S_4$, $FeAl_2Se_4$ and SCGO/BSZCGO, with possible theoretical values inferred from the classical models to which the quantum states of those materials may be connected. This comparison suggests that the lowest-energy states of higher-spin layered triangular-lattice compounds can be described in terms of doublet states on individual magnetic sites. Our analyses demonstrate how the values of entropy can reveal the structure of low-energy magnetic states in GF compounds and call for more accurate thermodynamic measurement in GF magnetic materials.