论文标题
单晶SRAGSB和SRAUSB半法的研究
Study of single crystalline SrAgSb and SrAuSb semimetals
论文作者
论文摘要
鉴于对具有不同程度的旋转轨道耦合的半金属化合物的电子性质的重新兴趣，我们已经种植了SRAGSB和SRAUSB的单晶，测量了其温度和磁场依赖性的电阻率和磁性磁化以及执行的密度功能（DFT）带状结构计算。磁化测量与具有少量的局部力矩杂质的磁磁性宿主一致。尽管所有研究样品的残留电阻率（RRR）相对较低，范围在2.4至3.4之间，但这些化合物的磁磁性不饱和（MR）分别为$ \ sim $ 17％和$ \ sim $ \ sim $ \ sim $ 70％，分别为SRAGSB和SRARAGSB和SRARAGSB的9 t。使用实验确定的SR，AG/AU和SB原子的Wyckoff位置的频带结构计算表明，SRAGSB是拓扑学上的琐碎，但补偿，半学的。 Srausb是一种拓扑性的，迪拉克半学。
Given renewed interest in the electronic properties of semimetallic compounds with varying degrees of spin orbit coupling we have grown single crystals of SrAgSb and SrAuSb, measured their temperature and field dependent electrical resistivity and magnetization and performed density functional theory (DFT) band structure calculations. Magnetization measurements are consistent with a diamagnetic host with a small amount of local moment bearing impurities. Although the residual resistivity ratio (RRR) for all samples studied was relatively low, ranging between 2.4 and 3.4, the compounds had non-saturating magnetoresistance (MR), reaching values of $\sim$ 17% and $\sim$ 70% at 4 K and 9 T for SrAgSb and SrAuSb respectively. Band structure calculations, using the experimentally determined Wyckoff positions for the Sr, Ag/Au, and Sb atoms, show that whereas SrAgSb is a topologically trivial, but compensated, semimetal; SrAuSb is a topologically non-trivial, Dirac semimetal.
