论文标题
量子偶极磁铁YB中的旋转激发（babo $ _3 $）$ _ 3 $
Spin excitations in the quantum dipolar magnet Yb(BaBO$_3$)$_3$
论文作者
论文摘要
我们报告了无序的Yb $^{3+} $三角形晶格YB（Babo $ _3 $）$ _ 3 $的磁化，特异性加热和MUON自旋放松测量结果。磁化实验显示了各向异性磁性特性，其温度为$θ_ {\ perp} = - 1.40 $ 〜k（$ h \ perp c $）和$θ_{\ parallel} = -1.16 $ 〜k（$ h \ \ h \ parallel c $）从低温数据中确定。在零场的情况下，远程抗铁磁顺序和自旋冷冻的缺失被确认为0.27 K。当施加的磁场$μ_0H> 0.7 $ 〜t时，从低温特异性热测量中观察到了由于地面KRAMER DOBLET的打开而导致的两级Schottky异常。在零字段，$ c _ {\ rm mag}/t $的增加和muon自旋松弛率$λ$低于1〜k是由于电子旋转激发而引起的，这些旋转激发通常存在于量子磁铁中，其中偶极 - 偶极 - 偶极 - 偶极相互作用会产生一种磁性特性。由于场诱导的激发密度的增加，旋转激发也得到了$λ$的异常最大依赖性的支持。我们认为，偶极相互作用是主导的，并在量子磁铁YB（babo $ _3 $）$ _ 3 $中诱导旋转动力学。
We report results of magnetization, specific-heat and muon-spin relaxation measurements on single crystals of disorder-free Yb$^{3+}$ triangular lattice Yb(BaBO$_3$)$_3$. The magnetization experiments show anisotropic magnetic properties with Curie-Weiss temperatures $θ_{\perp}=-1.40$~K ($H \perp c$) and $θ_{\parallel}=-1.16$~K ($H \parallel c$) determined from low temperature data. The absence of both long-range antiferromagnetic order and spin freezing is confirmed down to 0.27 K at zero field. A two-level Schottky anomaly due to the opening of the ground-state Kramers doublet is observed from the low-temperature specific-heat measurements when the applied magnetic fields $μ_0H >0.7$~T. At zero field, the increase of both $C_{\rm mag}/T$ and the muon spin relaxation rate $λ$ below 1~K is due to the electronic spin excitations, which often exist in quantum magnets where dipole-dipole interaction creates an anisotropy of magnetic properties. The spin excitation is also supported by the unusual maximum of field dependence of $λ$ due to the field-induced increase of the density of excitations. We argue that dipolar interaction is dominant and induces the spin dynamics in the quantum magnet Yb(BaBO$_3$)$_3$.
