铜矿石KCu3As2O7（OH）3中由独特轨道排列产生的畸变Kagome晶格
Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3
摘要：
我们通过测量2 K以上的磁化率和热容量来研究新候选自旋1/2 kagome反铁磁体KCu 3As 2 O 7（OH）3的多晶样品。注意到Cu ~（2+）kagome网上3 z ~ 2-r ~ 2和x ~ 2-y ~ 2轨道的独特排列，并与其他kagome矿物中发现的轨道模式进行了比较。它建议，这种轨道安排引起一个反铁磁和两个铁磁相互作用的等腰三角形形成一个高度扭曲的戈薇晶格。KCu 3As 2 O 7（OH）3在T_N = 7.2 K时表现出反铁磁长程序.值得注意的是，自旋熵在冷却到T_N以下时比传统的磁长程序更逐渐地释放，这可能源于这种高度扭曲的kagome晶格中仍然存在的几何挫折。
英文摘要：
We study polycrystalline samples of KCu3As2O7(OH)3, a new candidate spin-1/2 kagome antiferromagnet, by magnetic susceptibility and heat capacity measurements above 2 K. The unique arrangement of the 3z2 - r2 and x2 - y2 orbitals on the Cu2+ kagome net is noted and compared to the orbital patterns found in other kagome minerals. It is suggested that this orbital arrangement gives rise to one antiferromagnetic and two ferromagnetic interactions on isosceles triangles forming a highly distorted kagome lattice. KCu3As2O7(OH)3 is found to show an antiferromagnetic long-range order at T_N = 7.2 K. Remarkably, a spin entropy is more gradually released upon cooling below T_N compared with a conventional magnetic long-range order, which may originate from the geometrical frustration still present in this highly distorted kagome lattice.
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