Spin Liquids and Antiferromagnetic Order in the Shastry-Sutherland-Lattice Compound Yb2Pt2Pb
Spin Liquids and Antiferromagnetic Order in the Shastry-Sutherland-Lattice Compound Yb2Pt2Pb
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DOI：
10.1103/physrevlett.110.017201
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发表时间：
2013-01-02
影响因子：
8.6
通讯作者：
Aronson, M. C.
中科院分区：
文献类型：
--
作者：
Kim, M. S.;Aronson, M. C.
我们测量了金属Yb 2 Pt 2 Pb单晶的磁化率chi和磁化强度M，其中局部Yb矩位于二聚化和受挫的Shastry-Sutherland晶格（SSL）上。强磁阻挫被发现在这个准二维系统中，该命令反铁磁性在TN = 2.02 K从顺磁性液体的Yb二聚体，具有间隙三角洲= 4.6 K之间的单重基态和三重激发态。磁场抑制反铁磁（AF）秩序，消失在1.23 T的量子临界点。自旋能隙Δ持续到1.5 T，表明二聚体单线态在B = 0 AF状态的崩溃后存活。在AF状态（SSL系统的特征）内的M（B）中观察到量化步骤。我们的研究结果表明，Yb 2 Pt 2 Pb是独特的，无论是作为一个金属SSL系统，是接近AF量子临界点，并作为一个重费米子化合物，量子挫折起着决定性的作用。DOI：10.1103/PhysRevLett.110.017201
We present measurements of the magnetic susceptibility chi and the magnetization M of single crystals of metallic Yb2Pt2Pb, where localized Yb moments lie on the dimerized and frustrated Shastry-Sutherland lattice (SSL). Strong magnetic frustration is found in this quasi-two-dimensional system, which orders antiferromagnetically at T-N = 2.02 K from a paramagnetic liquid of Yb dimers, having a gap Delta = 4.6 K between the singlet ground state and the triplet excited states. Magnetic fields suppress the antiferromagnetic (AF) order, which vanishes at a 1.23 T quantum critical point. The spin gap Delta persists to 1.5 T, indicating that dimer singlets survive the collapse of the B = 0 AF state. Quantized steps are observed in M(B) within the AF state, a signature of SSL systems. Our results show that Yb2Pt2Pb is unique, both as a metallic SSL system that is close to an AF quantum critical point, and as a heavy fermion compound where quantum frustration plays a decisive role. DOI: 10.1103/PhysRevLett.110.017201