论文标题
一阶抗铁磁过渡和4F曲折链中的新型无间隙激发YBCUS2
First-Order Antiferromagnetic Transition and Novel Gapless Excitation in a 4f Zigzag Chain Compound YbCuS2
论文作者
论文摘要
我们报告了三价YB Zigzag链化合物YBCUS2的63/65CU核磁共振和核四极共振（NQR）研究。在顺磁性（PM）状态下观察到尖锐的NQR信号。以下至= 0.95 K，由反磁性（AFM）有序矩引起的内部磁场引起的多峰出现，并与PM信号降低到0.85 K并存，表现为一阶AFM相变为。此外，核自旋晶格弛豫率1/T1突然降低至0.5 k以下的T线性行为。显着的大1/T1T值强烈表明在低温区域中存在新型的无间隙自旋激发。
We report on the 63/65Cu-nuclear magnetic resonance and nuclear quadrupole resonance (NQR) studies of trivalent Yb zigzag chain compound YbCuS2. Sharp NQR signals were observed in the paramagnetic (PM) state. Below TO = 0.95 K, the multi peaks induced by the internal magnetic fields arising from the antferromagnetic (AFM) ordered moments appear and coexist with the PM signal down to 0.85 K, evidencing the first-order AFM phase transition at TO. In addition, the nuclear spin-lattice relaxation rate 1/T1 abruptly decreases below TO and shows the T-linear behavior below 0.5 K. The significant large 1/T1T value strongly suggests the presence of the novel gapless spin excitation in low temperature region.
