High-field magnetization and magnetoresistance of the honeycomb Kondo lattice alloys Ce(Pt1-xPdx)6Al3
High-field magnetization and magnetoresistance of the honeycomb Kondo lattice alloys Ce(Pt1-xPdx)6Al3
复制标题
蜂窝状近藤晶格合金Ce(Pt1-xPdx)6Al3的高场磁化强度和磁阻
DOI：
10.1088/1742-6596/2164/1/012033
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
T. Takabatake
中科院分区：
文献类型：
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作者：
R. Oishi;A. Miyake;M. Tokunaga;Y. Shimura;K. Umeo;T. Onimaru;T. Takabatake
CePt 6Al 3是Ce基蜂窝晶格化合物的罕见实例。用等价的Pt取代Pd，使基态从顺磁重费米子态转变为反铁磁（AFM）有序态。为了深入了解磁阻挫在蜂窝状近藤晶格中的作用，我们测量了Ce（Pt 1-xPdx）6Al 3（x≤ 0. 3）在高达60 T的脉冲磁场中的磁化强度M（B）和电阻率ρ（B）.对于x= 0的单晶，M（B）对B沿着易磁化轴的变磁性增加，ρ（B）沿易磁化轴的变磁性增加||c）Bm= 28 T时的弯曲。取B磁化率χ（T）中肩部的温度||当T × m= 17 K时，μBBm/kBT × m的比值估计为1.1。该值与具有相似Bm量级的Ce基顺磁重费米子化合物的报告值一致。在多晶样品中，随着x从0增加到0.3，M（B= 60 T）在1.4 K时的大小从0.75增加到2.0 μB/Ce，表明Pd替代Pt使局域4f矩恢复。利用M（B）和ρ（B）（x= 0.1，0.2，0.3）的数据，我们构建了B-T相图，该相图显示了从x= 0.1的小矩AFM有序态到x= 0.3的大矩AFM有序态的趋势。
CePt6Al3 is a rare example of the Ce-based honeycomb lattice compound. Substitution of the isovalent Pt for Pd transforms the ground state from a paramagnetic heavy-fermion state to an antiferromagnetic (AFM) ordered state. To gain insight into the role of magnetic frustration in the honeycomb Kondo lattice, we have measured the magnetization M (B) and electrical resistivity ρ (B) of Ce (Pt1-xPdx) 6Al3 (x≤ 0.3) in pulsed magnetic fields up to 60 T. For the single crystal with x= 0, M (B) for B along the easy c axis exhibits a metamagnetic increase and ρ (B|| c) bends at Bm= 28 T. Taking the temperature at a shoulder in the magnetic susceptibility χ (T) for B|| c as Tχm= 17 K, the ratio μBBm/kBTχm is estimated to be 1.1. This value agrees with those reported for Ce-based paramagnetic heavy-fermion compounds with similar magnitudes of Bm. With increasing x from 0 to 0.3 in polycrystalline samples, the magnitude of M (B= 60 T) at 1.4 K increases from 0.75 to 2.0 μB/Ce, indicating the recovery of localized 4f moments by the Pd substitution for Pt. Using the data of M (B) and ρ (B) for x= 0.1, 0.2, 0.3, we constructed B-T phase diagrams, which show a trend from a small moment AFM ordered state for x= 0.1 to a large moment AFM ordered state for x= 0.3.