论文标题
YBPDA中的半金属近代晶格行为，具有扭曲的kagome结构
Semimetallic Kondo lattice behavior in YbPdAs with a distorted kagome structure
论文作者
论文摘要
我们已经将YBPDA与六边形的Zrnial型结构合成，其中YB原子在六边形基础平面中形成扭曲的Kagome Sublattice。磁性，传输和热力学测量表明，YBPDA是一种低载体床位晶格化合物，在$ t_ \ mathrm {n} $ = 6.6 k时具有反铁磁性过渡，在$ t_ \ mathrm {n} $ couseconss n} $ t_ p_ \ tim = 6.6 k中略微抑制了磁场。 $ r \ ln {2} $，YB-ION的基态双线的完整熵。电阻率在30至15 K之间显示$ - \ ln t $依赖性，然后在冷却时在$ t \ rm_ {coh} $ = 12 k时具有广泛的最大值。低于$ t \ rm_ {coh} $，磁势从阴性变为阳性，表明从中等温度下的单人离子亲旋散射过程到低温下的连贯围质晶格行为。霍尔电阻率测量和带结构的计算都表明YBPDA中的载体浓度相对较低。我们的结果表明，YBPDA可以为检查低载体系统中的近代物理学和磁性挫败感的相互作用提供机会。
We have synthesized YbPdAs with the hexagonal ZrNiAl-type structure, in which the Yb-atoms form a distorted kagome sublattice in the hexagonal basal plane. Magnetic, transport, and thermodynamic measurements indicate that YbPdAs is a low-carrier Kondo lattice compound with an antiferromagnetic transition at $T_\mathrm{N}$ = 6.6 K, which is slightly suppressed in applied magnetic fields up to 9 T. The magnetic entropy at $T_\mathrm{N}$ recovers only 33\% of $R\ln{2}$, the full entropy of the ground state doublet of the Yb-ions. The resistivity displays a $-\ln T$ dependence between 30 and 15 K, followed by a broad maximum at $T\rm_{coh}$ = 12 K upon cooling. Below $T\rm_{coh}$, the magnetoresistance changes from negative to positive, suggesting a crossover from single-ion Kondo scattering processes at intermediate temperatures to coherent Kondo lattice behaviors at low temperatures. Both the Hall resistivity measurements and band structure calculations indicate a relatively low carrier concentration in YbPdAs. Our results suggest that YbPdAs could provide an opportunity for examining the interplay of Kondo physics and magnetic frustration in low carrier systems.
