标题： 李镱硒化物：一种新型尖晶石晶格中的受挫磁性 显示英文标题

标题： LiYbSe2: Frustrated Magnetism in a New Pyrochlore Lattice

摘要： 三维(3D)受挫磁体通常存在于磁性金刚石和尖晶石晶格中，在这些晶格中，量子涨落抑制磁序并产生高度纠缠的基态(GS)。 从LiCl通量生长中发现了一种以前未报道的尖晶石晶格中的LiYbSe2。 与承载完美三角形Yb3+晶格的量子自旋液体(QSL)候选物NaYbSe2不同，LiYbSe2结晶在立方尖晶石结构中，空间群为Fd-3m(编号227)。 LiYbSe2中的Yb3+离子排列在一个共享角的四面体网络上，这特别容易受到几何受挫的影响。 根据我们的温度依赖磁化率测量，LiYbSe2中的主要反铁磁相互作用预计出现在约8 K。然而，在70 mK以上的热磁测量中未检测到长程磁序。 比热测量也显示磁性关联在施加磁场下发生变化，缺失熵的程度可能与Li位点上Yb3+的轻微混合有关。 Yb3+的这种磁性受挫在尖晶石结构中很少见。 因此，LiYbSe2在本质上实现类似QSL的无序量子态方面显示出前景。 显示英文摘要

摘要： Three-dimensionally (3D) frustrated magnets generally exist in the magnetic diamond and pyrochlore lattices, in which quantum fluctuations suppress magnetic orders and generate highly entangled ground states (GS). LiYbSe2 in a previously unreported pyrochlore lattice was discovered from LiCl flux growth. Distinct from the quantum spin liquid (QSL) candidate NaYbSe2 hosting a perfect triangular lattice of Yb3+, LiYbSe2 crystallizes in the cubic pyrochlore structure with space group Fd-3m (No. 227). The Yb3+ ions in LiYbSe2 are arranged on a network of corner-sharing tetrahedra, which is particularly susceptible to geometrical frustration. According to our temperature-dependent magnetic susceptibility measurements, the dominant antiferromagnetic interaction in LiYbSe2 is expected to appear around 8 K. However, no long-range magnetic order is detected in thermomagnetic measurements above 70 mK. Specific heat measurements also show magnetic correlations shifting with applied magnetic field with a degree of missing entropy that may be related to the slight mixture of Yb3+ on the Li site. Such magnetic frustration of Yb3+ is rare in pyrochlore structures. Thus, LiYbSe2 shows promises in intrinsically realizing disordered quantum states like QSL in pyrochlore structures.