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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Strong spin frustration and negative magnetization in LnCu(3)(OH)(6)Cl-3 (Ln = Nd and Sm) with triangular lattices: the effects of lanthanides
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Strong spin frustration and negative magnetization in LnCu(3)(OH)(6)Cl-3 (Ln = Nd and Sm) with triangular lattices: the effects of lanthanides

机译：LNCU（3）（OH）（6）CL-3（LN = ND和SM）中强的旋转挫折和负磁化，三角形格子：镧系元素的影响

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摘要

Herbertsmithite-and kapellasite-type compounds with triangular lattices (i.e. Kagome) as the most promising candidates for realizing the exotic quantum spin liquid (QSL) state have recently attracted significant attention in condensed matter physics and materials science but are often adversely affected by dimensional imperfections arising from significant cation mixing. Also, interaction mechanisms between the Kagome lattices and ionic impurities remain unclear. Herein we report on the synthesis, crystal structures and magnetic properties of a new class of kapellasite-type compounds LnCu(3)(OH)(6)Cl-3 (Ln = Nd and Sm) with two overlapped triangular lattices. These compounds are characterized by the triangular lattices of Cu2+ superimposed by another triangular lattice of paramagnetic Ln(3+). The magnetic properties of LnCu(3)(OH)(6)Cl-3 feature strong spin frustrations as well as antisymmetrical Dzyaloshinskii-Moriya interactions resulting in canted antiferromagnetic ordering with the Neel temperature (TN) of similar to 20 K and similar to 18 K for NdCu3(OH)(6)Cl-3 and SmCu3(OH)(6)Cl-3, respectively. Moreover, negative magnetization at low temperatures was firstly observed in Kagome lattice compounds, arising from geometrical spin frustration and competing interactions within two overlapped triangular lattices.
机译：具有三角形格子（即Kagome）的Herbertsmithite-and Kapellasite型化合物作为实现异国情调的量子旋转液体（QSL）状态的最有前途的候选者最近在炼子物理和材料科学中引起了显着的关注，但经常受到维度缺陷的不利影响产生显着的阳离子混合。此外，Kagome格子和离子杂质之间的相互作用机制仍然不清楚。在此，我们报告了具有两个重叠三角形格子的新类Kapellasite型化合物LNCU（3）（OH）（OH）（6）CL-3（LN = ND和SM）的合成，晶体结构和磁性。这些化合物的特征在于Cu2 +的三角形晶格，由另一个三角形晶格的顺磁LN（3+）叠加。 LNCU（3）（OH）（6）CL-3的磁性特征具有强的旋转挫折，以及防诊的Dzyaloshinskii-moriya相互作用，导致倾斜的反铁磁性排序与20 k类似的NEER温度（TN），类似于18对于NDCU3（OH）（OH）（6）CL-3和SMCU3（OH）（6）CL-3的K分别。此外，在kagome晶格化合物中首先观察到低温下的负磁化，从两个重叠的三角形格子内的几何自旋挫折和竞争相互作用产生。

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